Commit 3527d3e9 authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:
 "The main changes in this cycle were:

   - another round of rq-clock handling debugging, robustization and
     fixes

   - PELT accounting improvements

   - CPU hotplug related ->cpus_allowed affinity handling fixes all
     around the tree

   - ... plus misc fixes, cleanups and updates"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (35 commits)
  sched/x86: Update reschedule warning text
  crypto: N2 - Replace racy task affinity logic
  cpufreq/sparc-us2e: Replace racy task affinity logic
  cpufreq/sparc-us3: Replace racy task affinity logic
  cpufreq/sh: Replace racy task affinity logic
  cpufreq/ia64: Replace racy task affinity logic
  ACPI/processor: Replace racy task affinity logic
  ACPI/processor: Fix error handling in __acpi_processor_start()
  sparc/sysfs: Replace racy task affinity logic
  powerpc/smp: Replace open coded task affinity logic
  ia64/sn/hwperf: Replace racy task affinity logic
  ia64/salinfo: Replace racy task affinity logic
  workqueue: Provide work_on_cpu_safe()
  ia64/topology: Remove cpus_allowed manipulation
  sched/fair: Move the PELT constants into a generated header
  sched/fair: Increase PELT accuracy for small tasks
  sched/fair: Fix comments
  sched/Documentation: Add 'sched-pelt' tool
  sched/fair: Fix corner case in __accumulate_sum()
  sched/core: Remove 'task' parameter and rename tsk_restore_flags() to current_restore_flags()
  ...
parents 3711c94f 21173d0b
/*
* The following program is used to generate the constants for
* computing sched averages.
*
* ==============================================================
* C program (compile with -lm)
* ==============================================================
*/
#include <math.h>
#include <stdio.h>
#define HALFLIFE 32
#define SHIFT 32
double y;
void calc_runnable_avg_yN_inv(void)
{
int i;
unsigned int x;
printf("static const u32 runnable_avg_yN_inv[] = {");
for (i = 0; i < HALFLIFE; i++) {
x = ((1UL<<32)-1)*pow(y, i);
if (i % 6 == 0) printf("\n\t");
printf("0x%8x, ", x);
}
printf("\n};\n\n");
}
int sum = 1024;
void calc_runnable_avg_yN_sum(void)
{
int i;
printf("static const u32 runnable_avg_yN_sum[] = {\n\t 0,");
for (i = 1; i <= HALFLIFE; i++) {
if (i == 1)
sum *= y;
else
sum = sum*y + 1024*y;
if (i % 11 == 0)
printf("\n\t");
printf("%5d,", sum);
}
printf("\n};\n\n");
}
int n = -1;
/* first period */
long max = 1024;
void calc_converged_max(void)
{
long last = 0, y_inv = ((1UL<<32)-1)*y;
for (; ; n++) {
if (n > -1)
max = ((max*y_inv)>>SHIFT) + 1024;
/*
* This is the same as:
* max = max*y + 1024;
*/
if (last == max)
break;
last = max;
}
n--;
printf("#define LOAD_AVG_PERIOD %d\n", HALFLIFE);
printf("#define LOAD_AVG_MAX %ld\n", max);
// printf("#define LOAD_AVG_MAX_N %d\n\n", n);
}
void calc_accumulated_sum_32(void)
{
int i, x = sum;
printf("static const u32 __accumulated_sum_N32[] = {\n\t 0,");
for (i = 1; i <= n/HALFLIFE+1; i++) {
if (i > 1)
x = x/2 + sum;
if (i % 6 == 0)
printf("\n\t");
printf("%6d,", x);
}
printf("\n};\n\n");
}
void main(void)
{
printf("/* Generated by Documentation/scheduler/sched-pelt; do not modify. */\n\n");
y = pow(0.5, 1/(double)HALFLIFE);
calc_runnable_avg_yN_inv();
// calc_runnable_avg_yN_sum();
calc_converged_max();
// calc_accumulated_sum_32();
}
...@@ -179,14 +179,14 @@ struct salinfo_platform_oemdata_parms { ...@@ -179,14 +179,14 @@ struct salinfo_platform_oemdata_parms {
const u8 *efi_guid; const u8 *efi_guid;
u8 **oemdata; u8 **oemdata;
u64 *oemdata_size; u64 *oemdata_size;
int ret;
}; };
static void static long
salinfo_platform_oemdata_cpu(void *context) salinfo_platform_oemdata_cpu(void *context)
{ {
struct salinfo_platform_oemdata_parms *parms = context; struct salinfo_platform_oemdata_parms *parms = context;
parms->ret = salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
} }
static void static void
...@@ -380,16 +380,7 @@ salinfo_log_release(struct inode *inode, struct file *file) ...@@ -380,16 +380,7 @@ salinfo_log_release(struct inode *inode, struct file *file)
return 0; return 0;
} }
static void static long
call_on_cpu(int cpu, void (*fn)(void *), void *arg)
{
cpumask_t save_cpus_allowed = current->cpus_allowed;
set_cpus_allowed_ptr(current, cpumask_of(cpu));
(*fn)(arg);
set_cpus_allowed_ptr(current, &save_cpus_allowed);
}
static void
salinfo_log_read_cpu(void *context) salinfo_log_read_cpu(void *context)
{ {
struct salinfo_data *data = context; struct salinfo_data *data = context;
...@@ -399,6 +390,7 @@ salinfo_log_read_cpu(void *context) ...@@ -399,6 +390,7 @@ salinfo_log_read_cpu(void *context)
/* Clear corrected errors as they are read from SAL */ /* Clear corrected errors as they are read from SAL */
if (rh->severity == sal_log_severity_corrected) if (rh->severity == sal_log_severity_corrected)
ia64_sal_clear_state_info(data->type); ia64_sal_clear_state_info(data->type);
return 0;
} }
static void static void
...@@ -430,7 +422,7 @@ salinfo_log_new_read(int cpu, struct salinfo_data *data) ...@@ -430,7 +422,7 @@ salinfo_log_new_read(int cpu, struct salinfo_data *data)
spin_unlock_irqrestore(&data_saved_lock, flags); spin_unlock_irqrestore(&data_saved_lock, flags);
if (!data->saved_num) if (!data->saved_num)
call_on_cpu(cpu, salinfo_log_read_cpu, data); work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
if (!data->log_size) { if (!data->log_size) {
data->state = STATE_NO_DATA; data->state = STATE_NO_DATA;
cpumask_clear_cpu(cpu, &data->cpu_event); cpumask_clear_cpu(cpu, &data->cpu_event);
...@@ -459,11 +451,13 @@ salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *p ...@@ -459,11 +451,13 @@ salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *p
return simple_read_from_buffer(buffer, count, ppos, buf, bufsize); return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
} }
static void static long
salinfo_log_clear_cpu(void *context) salinfo_log_clear_cpu(void *context)
{ {
struct salinfo_data *data = context; struct salinfo_data *data = context;
ia64_sal_clear_state_info(data->type); ia64_sal_clear_state_info(data->type);
return 0;
} }
static int static int
...@@ -486,7 +480,7 @@ salinfo_log_clear(struct salinfo_data *data, int cpu) ...@@ -486,7 +480,7 @@ salinfo_log_clear(struct salinfo_data *data, int cpu)
rh = (sal_log_record_header_t *)(data->log_buffer); rh = (sal_log_record_header_t *)(data->log_buffer);
/* Corrected errors have already been cleared from SAL */ /* Corrected errors have already been cleared from SAL */
if (rh->severity != sal_log_severity_corrected) if (rh->severity != sal_log_severity_corrected)
call_on_cpu(cpu, salinfo_log_clear_cpu, data); work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
/* clearing a record may make a new record visible */ /* clearing a record may make a new record visible */
salinfo_log_new_read(cpu, data); salinfo_log_new_read(cpu, data);
if (data->state == STATE_LOG_RECORD) { if (data->state == STATE_LOG_RECORD) {
...@@ -531,9 +525,8 @@ salinfo_log_write(struct file *file, const char __user *buffer, size_t count, lo ...@@ -531,9 +525,8 @@ salinfo_log_write(struct file *file, const char __user *buffer, size_t count, lo
.oemdata = &data->oemdata, .oemdata = &data->oemdata,
.oemdata_size = &data->oemdata_size .oemdata_size = &data->oemdata_size
}; };
call_on_cpu(cpu, salinfo_platform_oemdata_cpu, &parms); count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
if (parms.ret) &parms);
count = parms.ret;
} else } else
data->oemdata_size = 0; data->oemdata_size = 0;
} else } else
......
...@@ -355,18 +355,12 @@ static int cache_add_dev(unsigned int cpu) ...@@ -355,18 +355,12 @@ static int cache_add_dev(unsigned int cpu)
unsigned long i, j; unsigned long i, j;
struct cache_info *this_object; struct cache_info *this_object;
int retval = 0; int retval = 0;
cpumask_t oldmask;
if (all_cpu_cache_info[cpu].kobj.parent) if (all_cpu_cache_info[cpu].kobj.parent)
return 0; return 0;
oldmask = current->cpus_allowed;
retval = set_cpus_allowed_ptr(current, cpumask_of(cpu));
if (unlikely(retval))
return retval;
retval = cpu_cache_sysfs_init(cpu); retval = cpu_cache_sysfs_init(cpu);
set_cpus_allowed_ptr(current, &oldmask);
if (unlikely(retval < 0)) if (unlikely(retval < 0))
return retval; return retval;
......
...@@ -598,12 +598,17 @@ static void sn_hwperf_call_sal(void *info) ...@@ -598,12 +598,17 @@ static void sn_hwperf_call_sal(void *info)
op_info->ret = r; op_info->ret = r;
} }
static long sn_hwperf_call_sal_work(void *info)
{
sn_hwperf_call_sal(info);
return 0;
}
static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info) static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
{ {
u32 cpu; u32 cpu;
u32 use_ipi; u32 use_ipi;
int r = 0; int r = 0;
cpumask_t save_allowed;
cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32; cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32;
use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK; use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK;
...@@ -629,13 +634,9 @@ static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info) ...@@ -629,13 +634,9 @@ static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info)
/* use an interprocessor interrupt to call SAL */ /* use an interprocessor interrupt to call SAL */
smp_call_function_single(cpu, sn_hwperf_call_sal, smp_call_function_single(cpu, sn_hwperf_call_sal,
op_info, 1); op_info, 1);
} } else {
else { /* Call on the target CPU */
/* migrate the task before calling SAL */ work_on_cpu_safe(cpu, sn_hwperf_call_sal_work, op_info);
save_allowed = current->cpus_allowed;
set_cpus_allowed_ptr(current, cpumask_of(cpu));
sn_hwperf_call_sal(op_info);
set_cpus_allowed_ptr(current, &save_allowed);
} }
} }
r = op_info->ret; r = op_info->ret;
......
...@@ -787,24 +787,21 @@ static struct sched_domain_topology_level powerpc_topology[] = { ...@@ -787,24 +787,21 @@ static struct sched_domain_topology_level powerpc_topology[] = {
{ NULL, }, { NULL, },
}; };
void __init smp_cpus_done(unsigned int max_cpus) static __init long smp_setup_cpu_workfn(void *data __always_unused)
{ {
cpumask_var_t old_mask; smp_ops->setup_cpu(boot_cpuid);
return 0;
}
/* We want the setup_cpu() here to be called from CPU 0, but our void __init smp_cpus_done(unsigned int max_cpus)
* init thread may have been "borrowed" by another CPU in the meantime {
* se we pin us down to CPU 0 for a short while /*
* We want the setup_cpu() here to be called on the boot CPU, but
* init might run on any CPU, so make sure it's invoked on the boot
* CPU.
*/ */
alloc_cpumask_var(&old_mask, GFP_NOWAIT);
cpumask_copy(old_mask, &current->cpus_allowed);
set_cpus_allowed_ptr(current, cpumask_of(boot_cpuid));
if (smp_ops && smp_ops->setup_cpu) if (smp_ops && smp_ops->setup_cpu)
smp_ops->setup_cpu(boot_cpuid); work_on_cpu_safe(boot_cpuid, smp_setup_cpu_workfn, NULL);
set_cpus_allowed_ptr(current, old_mask);
free_cpumask_var(old_mask);
if (smp_ops && smp_ops->bringup_done) if (smp_ops && smp_ops->bringup_done)
smp_ops->bringup_done(); smp_ops->bringup_done();
...@@ -812,7 +809,6 @@ void __init smp_cpus_done(unsigned int max_cpus) ...@@ -812,7 +809,6 @@ void __init smp_cpus_done(unsigned int max_cpus)
dump_numa_cpu_topology(); dump_numa_cpu_topology();
set_sched_topology(powerpc_topology); set_sched_topology(powerpc_topology);
} }
#ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_HOTPLUG_CPU
......
...@@ -98,27 +98,7 @@ static struct attribute_group mmu_stat_group = { ...@@ -98,27 +98,7 @@ static struct attribute_group mmu_stat_group = {
.name = "mmu_stats", .name = "mmu_stats",
}; };
/* XXX convert to rusty's on_one_cpu */ static long read_mmustat_enable(void *data __maybe_unused)
static unsigned long run_on_cpu(unsigned long cpu,
unsigned long (*func)(unsigned long),
unsigned long arg)
{
cpumask_t old_affinity;
unsigned long ret;
cpumask_copy(&old_affinity, &current->cpus_allowed);
/* should return -EINVAL to userspace */
if (set_cpus_allowed_ptr(current, cpumask_of(cpu)))
return 0;
ret = func(arg);
set_cpus_allowed_ptr(current, &old_affinity);
return ret;
}
static unsigned long read_mmustat_enable(unsigned long junk)
{ {
unsigned long ra = 0; unsigned long ra = 0;
...@@ -127,11 +107,11 @@ static unsigned long read_mmustat_enable(unsigned long junk) ...@@ -127,11 +107,11 @@ static unsigned long read_mmustat_enable(unsigned long junk)
return ra != 0; return ra != 0;
} }
static unsigned long write_mmustat_enable(unsigned long val) static long write_mmustat_enable(void *data)
{ {
unsigned long ra, orig_ra; unsigned long ra, orig_ra, *val = data;
if (val) if (*val)
ra = __pa(&per_cpu(mmu_stats, smp_processor_id())); ra = __pa(&per_cpu(mmu_stats, smp_processor_id()));
else else
ra = 0UL; ra = 0UL;
...@@ -142,7 +122,8 @@ static unsigned long write_mmustat_enable(unsigned long val) ...@@ -142,7 +122,8 @@ static unsigned long write_mmustat_enable(unsigned long val)
static ssize_t show_mmustat_enable(struct device *s, static ssize_t show_mmustat_enable(struct device *s,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
unsigned long val = run_on_cpu(s->id, read_mmustat_enable, 0); long val = work_on_cpu(s->id, read_mmustat_enable, NULL);
return sprintf(buf, "%lx\n", val); return sprintf(buf, "%lx\n", val);
} }
...@@ -150,13 +131,15 @@ static ssize_t store_mmustat_enable(struct device *s, ...@@ -150,13 +131,15 @@ static ssize_t store_mmustat_enable(struct device *s,
struct device_attribute *attr, const char *buf, struct device_attribute *attr, const char *buf,
size_t count) size_t count)
{ {
unsigned long val, err; unsigned long val;
int ret = sscanf(buf, "%lu", &val); long err;
int ret;
ret = sscanf(buf, "%lu", &val);
if (ret != 1) if (ret != 1)
return -EINVAL; return -EINVAL;
err = run_on_cpu(s->id, write_mmustat_enable, val); err = work_on_cpu(s->id, write_mmustat_enable, &val);
if (err) if (err)
return -EIO; return -EIO;
......
...@@ -124,7 +124,7 @@ static bool smp_no_nmi_ipi = false; ...@@ -124,7 +124,7 @@ static bool smp_no_nmi_ipi = false;
static void native_smp_send_reschedule(int cpu) static void native_smp_send_reschedule(int cpu)
{ {
if (unlikely(cpu_is_offline(cpu))) { if (unlikely(cpu_is_offline(cpu))) {
WARN_ON(1); WARN(1, "sched: Unexpected reschedule of offline CPU#%d!\n", cpu);
return; return;
} }
apic->send_IPI(cpu, RESCHEDULE_VECTOR); apic->send_IPI(cpu, RESCHEDULE_VECTOR);
......
...@@ -251,6 +251,9 @@ static int __acpi_processor_start(struct acpi_device *device) ...@@ -251,6 +251,9 @@ static int __acpi_processor_start(struct acpi_device *device)
if (ACPI_SUCCESS(status)) if (ACPI_SUCCESS(status))
return 0; return 0;
result = -ENODEV;
acpi_pss_perf_exit(pr, device);
err_power_exit: err_power_exit:
acpi_processor_power_exit(pr); acpi_processor_power_exit(pr);
return result; return result;
...@@ -259,11 +262,16 @@ static int __acpi_processor_start(struct acpi_device *device) ...@@ -259,11 +262,16 @@ static int __acpi_processor_start(struct acpi_device *device)
static int acpi_processor_start(struct device *dev) static int acpi_processor_start(struct device *dev)
{ {
struct acpi_device *device = ACPI_COMPANION(dev); struct acpi_device *device = ACPI_COMPANION(dev);
int ret;
if (!device) if (!device)
return -ENODEV; return -ENODEV;
return __acpi_processor_start(device); /* Protect against concurrent CPU hotplug operations */
get_online_cpus();
ret = __acpi_processor_start(device);
put_online_cpus();
return ret;
} }
static int acpi_processor_stop(struct device *dev) static int acpi_processor_stop(struct device *dev)
......
...@@ -62,8 +62,8 @@ struct acpi_processor_throttling_arg { ...@@ -62,8 +62,8 @@ struct acpi_processor_throttling_arg {
#define THROTTLING_POSTCHANGE (2) #define THROTTLING_POSTCHANGE (2)
static int acpi_processor_get_throttling(struct acpi_processor *pr); static int acpi_processor_get_throttling(struct acpi_processor *pr);
int acpi_processor_set_throttling(struct acpi_processor *pr, static int __acpi_processor_set_throttling(struct acpi_processor *pr,
int state, bool force); int state, bool force, bool direct);
static int acpi_processor_update_tsd_coord(void) static int acpi_processor_update_tsd_coord(void)
{ {
...@@ -891,7 +891,8 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) ...@@ -891,7 +891,8 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
ACPI_DEBUG_PRINT((ACPI_DB_INFO, ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Invalid throttling state, reset\n")); "Invalid throttling state, reset\n"));
state = 0; state = 0;
ret = acpi_processor_set_throttling(pr, state, true); ret = __acpi_processor_set_throttling(pr, state, true,
true);
if (ret) if (ret)
return ret; return ret;
} }
...@@ -901,36 +902,31 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr) ...@@ -901,36 +902,31 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
return 0; return 0;
} }
static int acpi_processor_get_throttling(struct acpi_processor *pr) static long __acpi_processor_get_throttling(void *data)
{ {
cpumask_var_t saved_mask; struct acpi_processor *pr = data;
int ret;
return pr->throttling.acpi_processor_get_throttling(pr);
}
static int acpi_processor_get_throttling(struct acpi_processor *pr)
{
if (!pr) if (!pr)
return -EINVAL; return -EINVAL;
if (!pr->flags.throttling) if (!pr->flags.throttling)
return -ENODEV; return -ENODEV;
if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
return -ENOMEM;
/* /*
* Migrate task to the cpu pointed by pr. * This is either called from the CPU hotplug callback of
* processor_driver or via the ACPI probe function. In the latter
* case the CPU is not guaranteed to be online. Both call sites are
* protected against CPU hotplug.
*/ */
cpumask_copy(saved_mask, &current->cpus_allowed); if (!cpu_online(pr->id))
/* FIXME: use work_on_cpu() */
if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) {
/* Can't migrate to the target pr->id CPU. Exit */
free_cpumask_var(saved_mask);
return -ENODEV; return -ENODEV;
}
ret = pr->throttling.acpi_processor_get_throttling(pr);
/* restore the previous state */
set_cpus_allowed_ptr(current, saved_mask);
free_cpumask_var(saved_mask);
return ret; return work_on_cpu(pr->id, __acpi_processor_get_throttling, pr);
} }
static int acpi_processor_get_fadt_info(struct acpi_processor *pr) static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
...@@ -1080,8 +1076,15 @@ static long acpi_processor_throttling_fn(void *data) ...@@ -1080,8 +1076,15 @@ static long acpi_processor_throttling_fn(void *data)
arg->target_state, arg->force); arg->target_state, arg->force);
} }
int acpi_processor_set_throttling(struct acpi_processor *pr, static int call_on_cpu(int cpu, long (*fn)(void *), void *arg, bool direct)
int state, bool force) {
if (direct)
return fn(arg);
return work_on_cpu(cpu, fn, arg);
}
static int __acpi_processor_set_throttling(struct acpi_processor *pr,
int state, bool force, bool direct)
{ {
int ret = 0; int ret = 0;
unsigned int i; unsigned int i;
...@@ -1130,7 +1133,8 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, ...@@ -1130,7 +1133,8 @@ int acpi_processor_set_throttling(struct acpi_processor *pr,
arg.pr = pr; arg.pr = pr;
arg.target_state = state; arg.target_state = state;
arg.force = force; arg.force = force;
ret = work_on_cpu(pr->id, acpi_processor_throttling_fn, &arg); ret = call_on_cpu(pr->id, acpi_processor_throttling_fn, &arg,
direct);
} else { } else {
/* /*
* When the T-state coordination is SW_ALL or HW_ALL, * When the T-state coordination is SW_ALL or HW_ALL,
...@@ -1163,8 +1167,8 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, ...@@ -1163,8 +1167,8 @@ int acpi_processor_set_throttling(struct acpi_processor *pr,
arg.pr = match_pr; arg.pr = match_pr;
arg.target_state = state; arg.target_state = state;
arg.force = force; arg.force = force;
ret = work_on_cpu(pr->id, acpi_processor_throttling_fn, ret = call_on_cpu(pr->id, acpi_processor_throttling_fn,
&arg); &arg, direct);
} }
} }
/* /*
...@@ -1182,6 +1186,12 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, ...@@ -1182,6 +1186,12 @@ int acpi_processor_set_throttling(struct acpi_processor *pr,
return ret; return ret;
} }
int acpi_processor_set_throttling(struct acpi_processor *pr, int state,
bool force)
{
return __acpi_processor_set_throttling(pr, state, force, false);
}
int acpi_processor_get_throttling_info(struct acpi_processor *pr) int acpi_processor_get_throttling_info(struct acpi_processor *pr)
{ {
int result = 0; int result = 0;
......
...@@ -381,7 +381,7 @@ static int sock_xmit(struct nbd_device *nbd, int index, int send, ...@@ -381,7 +381,7 @@ static int sock_xmit(struct nbd_device *nbd, int index, int send,
*sent += result; *sent += result;
} while (msg_data_left(&msg)); } while (msg_data_left(&msg));
tsk_restore_flags(current, pflags, PF_MEMALLOC); current_restore_flags(pflags, PF_MEMALLOC);
return result; return result;
} }
......
...@@ -34,6 +34,11 @@ struct cpufreq_acpi_io { ...@@ -34,6 +34,11 @@ struct cpufreq_acpi_io {
unsigned int resume; unsigned int resume;
}; };
struct cpufreq_acpi_req {
unsigned int cpu;
unsigned int state;
};
static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS]; static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS];
static struct cpufreq_driver acpi_cpufreq_driver; static struct cpufreq_driver acpi_cpufreq_driver;
...@@ -83,8 +88,7 @@ processor_get_pstate ( ...@@ -83,8 +88,7 @@ processor_get_pstate (
static unsigned static unsigned
extract_clock ( extract_clock (
struct cpufreq_acpi_io *data, struct cpufreq_acpi_io *data,
unsigned value, unsigned value)
unsigned int cpu)
{ {
unsigned long i; unsigned long i;
...@@ -98,60 +102,43 @@ extract_clock ( ...@@ -98,60 +102,43 @@ extract_clock (
} }
static unsigned int static long
processor_get_freq ( processor_get_freq (
struct cpufreq_acpi_io *data, void *arg)
unsigned int cpu)
{ {
int ret = 0; struct cpufreq_acpi_req *req = arg;
u32 value = 0; unsigned int cpu = req->cpu;
cpumask_t saved_mask; struct cpufreq_acpi_io *data = acpi_io_data[cpu];
unsigned long clock_freq; u32 value;
int ret;
pr_debug("processor_get_freq\n"); pr_debug("processor_get_freq\n");
saved_mask = current->cpus_allowed;
set_cpus_allowed_ptr(current, cpumask_of(cpu));
if (smp_processor_id() != cpu) if (smp_processor_id() != cpu)
goto migrate_end; return -EAGAIN;
/* processor_get_pstate gets the instantaneous frequency */ /* processor_get_pstate gets the instantaneous frequency */
ret = processor_get_pstate(&value); ret = processor_get_pstate(&value);
if (ret) { if (ret) {
set_cpus_allowed_ptr(current, &saved_mask);
pr_warn("get performance failed with error %d\n", ret); pr_warn("get performance failed with error %d\n", ret);
ret = 0;
goto migrate_end;
}
clock_freq = extract_clock(data, value, cpu);
ret = (clock_freq*1000);
migrate_end:
set_cpus_allowed_ptr(current, &saved_mask);
return ret; return ret;
}
return 1000 * extract_clock(data, value);
} }
static int static long
processor_set_freq ( processor_set_freq (
struct cpufreq_acpi_io *data, void *arg)
struct cpufreq_policy *policy,
int state)
{ {
int ret = 0; struct cpufreq_acpi_req *req = arg;
u32 value = 0; unsigned int cpu = req->cpu;
cpumask_t saved_mask; struct cpufreq_acpi_io *data = acpi_io_data[cpu];
int retval; int ret, state = req->state;
u32 value;
pr_debug("processor_set_freq\n"); pr_debug("processor_set_freq\n");
if (smp_processor_id() != cpu)
saved_mask = current->cpus_allowed; return -EAGAIN;
set_cpus_allowed_ptr(current, cpumask_of(policy->cpu));
if (smp_processor_id() != policy->cpu) {
retval = -EAGAIN;
goto migrate_end;
}
if (state == data->acpi_data.state) { if (state == data->acpi_data.state) {
if (unlikely(data->resume)) { if (unlikely(data->resume)) {
...@@ -159,8 +146,7 @@ processor_set_freq ( ...@@ -159,8 +146,7 @@ processor_set_freq (
data->resume = 0; data->resume = 0;
} else { } else {
pr_debug("Already at target state (P%d)\n", state); pr_debug("Already at target state (P%d)\n", state);
retval = 0; return 0;
goto migrate_end;
} }
} }
...@@ -171,7 +157,6 @@ processor_set_freq ( ...@@ -171,7 +157,6 @@ processor_set_freq (
* First we write the target state's 'control' value to the * First we write the target state's 'control' value to the
* control_register. * control_register.
*/ */
value = (u32) data->acpi_data.states[state].control; value = (u32) data->acpi_data.states[state].control;
pr_debug("Transitioning to state: 0x%08x\n", value); pr_debug("Transitioning to state: 0x%08x\n", value);
...@@ -179,17 +164,11 @@ processor_set_freq ( ...@@ -179,17 +164,11 @@ processor_set_freq (
ret = processor_set_pstate(value); ret = processor_set_pstate(value);
if (ret) { if (ret) {
pr_warn("Transition failed with error %d\n", ret); pr_warn("Transition failed with error %d\n", ret);
retval = -ENODEV; return -ENODEV;
goto migrate_end;
} }
data->acpi_data.state = state; data->acpi_data.state = state;
return 0;
retval = 0;
migrate_end:
set_cpus_allowed_ptr(current, &saved_mask);
return (retval);
} }
...@@ -197,11 +176,13 @@ static unsigned int ...@@ -197,11 +176,13 @@ static unsigned int
acpi_cpufreq_get ( acpi_cpufreq_get (
unsigned int cpu) unsigned int cpu)
{ {
struct cpufreq_acpi_io *data = acpi_io_data[cpu]; struct cpufreq_acpi_req req;
long ret;
pr_debug("acpi_cpufreq_get\n"); req.cpu = cpu;
ret = work_on_cpu(cpu, processor_get_freq, &req);
return processor_get_freq(data, cpu); return ret > 0 ? (unsigned int) ret : 0;
} }
...@@ -210,7 +191,12 @@ acpi_cpufreq_target ( ...@@ -210,7 +191,12 @@ acpi_cpufreq_target (
struct cpufreq_policy *policy, struct cpufreq_policy *policy,
unsigned int index) unsigned int index)
{ {
return processor_set_freq(acpi_io_data[policy->cpu], policy, index); struct cpufreq_acpi_req req;
req.cpu = policy->cpu;
req.state = index;
return work_on_cpu(req.cpu, processor_set_freq, &req);
} }
static int static int
......
...@@ -30,54 +30,63 @@ ...@@ -30,54 +30,63 @@
static DEFINE_PER_CPU(struct clk, sh_cpuclk); static DEFINE_PER_CPU(struct clk, sh_cpuclk);
struct cpufreq_target {
struct cpufreq_policy *policy;
unsigned int freq;
};
static unsigned int sh_cpufreq_get(unsigned int cpu) static unsigned int sh_cpufreq_get(unsigned int cpu)
{ {
return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000; return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
} }
/* static long __sh_cpufreq_target(void *arg)
* Here we notify other drivers of the proposed change and the final change.
*/
static int sh_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{ {
unsigned int cpu = policy->cpu; struct cpufreq_target *target = arg;
struct cpufreq_policy *policy = target->policy;
int cpu = policy->cpu;
struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu); struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
cpumask_t cpus_allowed;
struct cpufreq_freqs freqs; struct cpufreq_freqs freqs;
struct device *dev; struct device *dev;
long freq; long freq;
cpus_allowed = current->cpus_allowed; if (smp_processor_id() != cpu)
set_cpus_allowed_ptr(current, cpumask_of(cpu)); return -ENODEV;
BUG_ON(smp_processor_id() != cpu);
dev = get_cpu_device(cpu); dev = get_cpu_device(cpu);
/* Convert target_freq from kHz to Hz */ /* Convert target_freq from kHz to Hz */
freq = clk_round_rate(cpuclk, target_freq * 1000); freq = clk_round_rate(cpuclk, target->freq * 1000);
if (freq < (policy->min * 1000) || freq > (policy->max * 1000)) if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
return -EINVAL; return -EINVAL;
dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000); dev_dbg(dev, "requested frequency %u Hz\n", target->freq * 1000);
freqs.old = sh_cpufreq_get(cpu); freqs.old = sh_cpufreq_get(cpu);
freqs.new = (freq + 500) / 1000; freqs.new = (freq + 500) / 1000;
freqs.flags = 0; freqs.flags = 0;
cpufreq_freq_transition_begin(policy, &freqs); cpufreq_freq_transition_begin(target->policy, &freqs);
set_cpus_allowed_ptr(current, &cpus_allowed);
clk_set_rate(cpuclk, freq); clk_set_rate(cpuclk, freq);
cpufreq_freq_transition_end(policy, &freqs, 0); cpufreq_freq_transition_end(target->policy, &freqs, 0);
dev_dbg(dev, "set frequency %lu Hz\n", freq); dev_dbg(dev, "set frequency %lu Hz\n", freq);
return 0; return 0;
} }
/*
* Here we notify other drivers of the proposed change and the final change.
*/
static int sh_cpufreq_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
struct cpufreq_target data = { .policy = policy, .freq = target_freq };
return work_on_cpu(policy->cpu, __sh_cpufreq_target, &data);
}
static int sh_cpufreq_verify(struct cpufreq_policy *policy) static int sh_cpufreq_verify(struct cpufreq_policy *policy)
{ {
struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu); struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
......
...@@ -118,10 +118,6 @@ static void us2e_transition(unsigned long estar, unsigned long new_bits, ...@@ -118,10 +118,6 @@ static void us2e_transition(unsigned long estar, unsigned long new_bits,
unsigned long clock_tick, unsigned long clock_tick,
unsigned long old_divisor, unsigned long divisor) unsigned long old_divisor, unsigned long divisor)
{ {
unsigned long flags;
local_irq_save(flags);
estar &= ~ESTAR_MODE_DIV_MASK; estar &= ~ESTAR_MODE_DIV_MASK;
/* This is based upon the state transition diagram in the IIe manual. */ /* This is based upon the state transition diagram in the IIe manual. */
...@@ -152,8 +148,6 @@ static void us2e_transition(unsigned long estar, unsigned long new_bits, ...@@ -152,8 +148,6 @@ static void us2e_transition(unsigned long estar, unsigned long new_bits,
} else { } else {
BUG(); BUG();
} }
local_irq_restore(flags);
} }
static unsigned long index_to_estar_mode(unsigned int index) static unsigned long index_to_estar_mode(unsigned int index)
...@@ -229,48 +223,51 @@ static unsigned long estar_to_divisor(unsigned long estar) ...@@ -229,48 +223,51 @@ static unsigned long estar_to_divisor(unsigned long estar)
return ret; return ret;
} }
static void __us2e_freq_get(void *arg)
{
unsigned long *estar = arg;
*estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
}
static unsigned int us2e_freq_get(unsigned int cpu) static unsigned int us2e_freq_get(unsigned int cpu)
{ {
cpumask_t cpus_allowed;
unsigned long clock_tick, estar; unsigned long clock_tick, estar;
cpumask_copy(&cpus_allowed, &current->cpus_allowed);
set_cpus_allowed_ptr(current, cpumask_of(cpu));
clock_tick = sparc64_get_clock_tick(cpu) / 1000; clock_tick = sparc64_get_clock_tick(cpu) / 1000;
estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR); if (smp_call_function_single(cpu, __us2e_freq_get, &estar, 1))
return 0;
set_cpus_allowed_ptr(current, &cpus_allowed);
return clock_tick / estar_to_divisor(estar); return clock_tick / estar_to_divisor(estar);
} }
static int us2e_freq_target(struct cpufreq_policy *policy, unsigned int index) static void __us2e_freq_target(void *arg)
{ {
unsigned int cpu = policy->cpu; unsigned int cpu = smp_processor_id();
unsigned int *index = arg;
unsigned long new_bits, new_freq; unsigned long new_bits, new_freq;
unsigned long clock_tick, divisor, old_divisor, estar; unsigned long clock_tick, divisor, old_divisor, estar;
cpumask_t cpus_allowed;
cpumask_copy(&cpus_allowed, &current->cpus_allowed);
set_cpus_allowed_ptr(current, cpumask_of(cpu));
new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000; new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000;
new_bits = index_to_estar_mode(index); new_bits = index_to_estar_mode(*index);
divisor = index_to_divisor(index); divisor = index_to_divisor(*index);
new_freq /= divisor; new_freq /= divisor;
estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR); estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
old_divisor = estar_to_divisor(estar); old_divisor = estar_to_divisor(estar);
if (old_divisor != divisor) if (old_divisor != divisor) {
us2e_transition(estar, new_bits, clock_tick * 1000, us2e_transition(estar, new_bits, clock_tick * 1000,
old_divisor, divisor); old_divisor, divisor);
}
}
set_cpus_allowed_ptr(current, &cpus_allowed); static int us2e_freq_target(struct cpufreq_policy *policy, unsigned int index)
{
unsigned int cpu = policy->cpu;
return 0; return smp_call_function_single(cpu, __us2e_freq_target, &index, 1);
} }
static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy) static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy)
......
...@@ -35,22 +35,28 @@ static struct us3_freq_percpu_info *us3_freq_table; ...@@ -35,22 +35,28 @@ static struct us3_freq_percpu_info *us3_freq_table;
#define SAFARI_CFG_DIV_32 0x0000000080000000UL #define SAFARI_CFG_DIV_32 0x0000000080000000UL
#define SAFARI_CFG_DIV_MASK 0x00000000C0000000UL #define SAFARI_CFG_DIV_MASK 0x00000000C0000000UL
static unsigned long read_safari_cfg(void) static void read_safari_cfg(void *arg)
{ {
unsigned long ret; unsigned long ret, *val = arg;
__asm__ __volatile__("ldxa [%%g0] %1, %0" __asm__ __volatile__("ldxa [%%g0] %1, %0"
: "=&r" (ret) : "=&r" (ret)
: "i" (ASI_SAFARI_CONFIG)); : "i" (ASI_SAFARI_CONFIG));
return ret; *val = ret;
} }
static void write_safari_cfg(unsigned long val) static void update_safari_cfg(void *arg)
{ {
unsigned long reg, *new_bits = arg;
read_safari_cfg(&reg);
reg &= ~SAFARI_CFG_DIV_MASK;
reg |= *new_bits;
__asm__ __volatile__("stxa %0, [%%g0] %1\n\t" __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
"membar #Sync" "membar #Sync"
: /* no outputs */ : /* no outputs */
: "r" (val), "i" (ASI_SAFARI_CONFIG) : "r" (reg), "i" (ASI_SAFARI_CONFIG)
: "memory"); : "memory");
} }
...@@ -78,29 +84,17 @@ static unsigned long get_current_freq(unsigned int cpu, unsigned long safari_cfg ...@@ -78,29 +84,17 @@ static unsigned long get_current_freq(unsigned int cpu, unsigned long safari_cfg
static unsigned int us3_freq_get(unsigned int cpu) static unsigned int us3_freq_get(unsigned int cpu)
{ {
cpumask_t cpus_allowed;
unsigned long reg; unsigned long reg;
unsigned int ret;
cpumask_copy(&cpus_allowed, &current->cpus_allowed);
set_cpus_allowed_ptr(current, cpumask_of(cpu));
reg = read_safari_cfg();
ret = get_current_freq(cpu, reg);
set_cpus_allowed_ptr(current, &cpus_allowed);
return ret; if (smp_call_function_single(cpu, read_safari_cfg, &reg, 1))
return 0;
return get_current_freq(cpu, reg);
} }
static int us3_freq_target(struct cpufreq_policy *policy, unsigned int index) static int us3_freq_target(struct cpufreq_policy *policy, unsigned int index)
{ {
unsigned int cpu = policy->cpu; unsigned int cpu = policy->cpu;
unsigned long new_bits, new_freq, reg; unsigned long new_bits, new_freq;
cpumask_t cpus_allowed;
cpumask_copy(&cpus_allowed, &current->cpus_allowed);
set_cpus_allowed_ptr(current, cpumask_of(cpu));
new_freq = sparc64_get_clock_tick(cpu) / 1000; new_freq = sparc64_get_clock_tick(cpu) / 1000;
switch (index) { switch (index) {
...@@ -121,15 +115,7 @@ static int us3_freq_target(struct cpufreq_policy *policy, unsigned int index) ...@@ -121,15 +115,7 @@ static int us3_freq_target(struct cpufreq_policy *policy, unsigned int index)
BUG(); BUG();
} }
reg = read_safari_cfg(); return smp_call_function_single(cpu, update_safari_cfg, &new_bits, 1);
reg &= ~SAFARI_CFG_DIV_MASK;
reg |= new_bits;
write_safari_cfg(reg);
set_cpus_allowed_ptr(current, &cpus_allowed);
return 0;
} }
static int __init us3_freq_cpu_init(struct cpufreq_policy *policy) static int __init us3_freq_cpu_init(struct cpufreq_policy *policy)
......
...@@ -65,6 +65,11 @@ struct spu_queue { ...@@ -65,6 +65,11 @@ struct spu_queue {
struct list_head list; struct list_head list;
}; };
struct spu_qreg {
struct spu_queue *queue;
unsigned long type;
};
static struct spu_queue **cpu_to_cwq; static struct spu_queue **cpu_to_cwq;
static struct spu_queue **cpu_to_mau; static struct spu_queue **cpu_to_mau;
...@@ -1631,31 +1636,27 @@ static void queue_cache_destroy(void) ...@@ -1631,31 +1636,27 @@ static void queue_cache_destroy(void)
kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_CWQ - 1]); kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_CWQ - 1]);
} }
static int spu_queue_register(struct spu_queue *p, unsigned long q_type) static long spu_queue_register_workfn(void *arg)
{ {
cpumask_var_t old_allowed; struct spu_qreg *qr = arg;
struct spu_queue *p = qr->queue;
unsigned long q_type = qr->type;
unsigned long hv_ret; unsigned long hv_ret;
if (cpumask_empty(&p->sharing))
return -EINVAL;
if (!alloc_cpumask_var(&old_allowed, GFP_KERNEL))
return -ENOMEM;
cpumask_copy(old_allowed, &current->cpus_allowed);
set_cpus_allowed_ptr(current, &p->sharing);
hv_ret = sun4v_ncs_qconf(q_type, __pa(p->q), hv_ret = sun4v_ncs_qconf(q_type, __pa(p->q),
CWQ_NUM_ENTRIES, &p->qhandle); CWQ_NUM_ENTRIES, &p->qhandle);
if (!hv_ret) if (!hv_ret)
sun4v_ncs_sethead_marker(p->qhandle, 0); sun4v_ncs_sethead_marker(p->qhandle, 0);
set_cpus_allowed_ptr(current, old_allowed); return hv_ret ? -EINVAL : 0;
}
free_cpumask_var(old_allowed); static int spu_queue_register(struct spu_queue *p, unsigned long q_type)
{
int cpu = cpumask_any_and(&p->sharing, cpu_online_mask);
struct spu_qreg qr = { .queue = p, .type = q_type };
return (hv_ret ? -EINVAL : 0); return work_on_cpu_safe(cpu, spu_queue_register_workfn, &qr);
} }
static int spu_queue_setup(struct spu_queue *p) static int spu_queue_setup(struct spu_queue *p)
......
...@@ -387,7 +387,7 @@ static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) ...@@ -387,7 +387,7 @@ static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
rc = 0; rc = 0;
} }
tsk_restore_flags(current, pflags, PF_MEMALLOC); current_restore_flags(pflags, PF_MEMALLOC);
return rc; return rc;
} }
......
...@@ -1004,7 +1004,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, ...@@ -1004,7 +1004,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
else else
err = nfserrno(host_err); err = nfserrno(host_err);
if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) if (test_bit(RQ_LOCAL, &rqstp->rq_flags))
tsk_restore_flags(current, pflags, PF_LESS_THROTTLE); current_restore_flags(pflags, PF_LESS_THROTTLE);
return err; return err;
} }
......
...@@ -1290,10 +1290,10 @@ TASK_PFA_TEST(LMK_WAITING, lmk_waiting) ...@@ -1290,10 +1290,10 @@ TASK_PFA_TEST(LMK_WAITING, lmk_waiting)
TASK_PFA_SET(LMK_WAITING, lmk_waiting) TASK_PFA_SET(LMK_WAITING, lmk_waiting)
static inline void static inline void
tsk_restore_flags(struct task_struct *task, unsigned long orig_flags, unsigned long flags) current_restore_flags(unsigned long orig_flags, unsigned long flags)
{ {
task->flags &= ~flags; current->flags &= ~flags;
task->flags |= orig_flags & flags; current->flags |= orig_flags & flags;
} }
extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
......
...@@ -608,8 +608,13 @@ static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg) ...@@ -608,8 +608,13 @@ static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
{ {
return fn(arg); return fn(arg);
} }
static inline long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg)
{
return fn(arg);
}
#else #else
long work_on_cpu(int cpu, long (*fn)(void *), void *arg); long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg);
#endif /* CONFIG_SMP */ #endif /* CONFIG_SMP */
#ifdef CONFIG_FREEZER #ifdef CONFIG_FREEZER
......
This diff is collapsed.
This diff is collapsed.
...@@ -56,6 +56,13 @@ SCHED_FEAT(TTWU_QUEUE, true) ...@@ -56,6 +56,13 @@ SCHED_FEAT(TTWU_QUEUE, true)
*/ */
SCHED_FEAT(SIS_AVG_CPU, false) SCHED_FEAT(SIS_AVG_CPU, false)
/*
* Issue a WARN when we do multiple update_rq_clock() calls
* in a single rq->lock section. Default disabled because the
* annotations are not complete.
*/
SCHED_FEAT(WARN_DOUBLE_CLOCK, false)
#ifdef HAVE_RT_PUSH_IPI #ifdef HAVE_RT_PUSH_IPI
/* /*
* In order to avoid a thundering herd attack of CPUs that are * In order to avoid a thundering herd attack of CPUs that are
......
...@@ -1927,6 +1927,87 @@ static int find_next_push_cpu(struct rq *rq) ...@@ -1927,6 +1927,87 @@ static int find_next_push_cpu(struct rq *rq)
#define RT_PUSH_IPI_EXECUTING 1 #define RT_PUSH_IPI_EXECUTING 1
#define RT_PUSH_IPI_RESTART 2 #define RT_PUSH_IPI_RESTART 2
/*
* When a high priority task schedules out from a CPU and a lower priority
* task is scheduled in, a check is made to see if there's any RT tasks
* on other CPUs that are waiting to run because a higher priority RT task
* is currently running on its CPU. In this case, the CPU with multiple RT
* tasks queued on it (overloaded) needs to be notified that a CPU has opened
* up that may be able to run one of its non-running queued RT tasks.
*
* On large CPU boxes, there's the case that several CPUs could schedule
* a lower priority task at the same time, in which case it will look for
* any overloaded CPUs that it could pull a task from. To do this, the runqueue
* lock must be taken from that overloaded CPU. Having 10s of CPUs all fighting
* for a single overloaded CPU's runqueue lock can produce a large latency.
* (This has actually been observed on large boxes running cyclictest).
* Instead of taking the runqueue lock of the overloaded CPU, each of the
* CPUs that scheduled a lower priority task simply sends an IPI to the
* overloaded CPU. An IPI is much cheaper than taking an runqueue lock with
* lots of contention. The overloaded CPU will look to push its non-running
* RT task off, and if it does, it can then ignore the other IPIs coming
* in, and just pass those IPIs off to any other overloaded CPU.
*
* When a CPU schedules a lower priority task, it only sends an IPI to
* the "next" CPU that has overloaded RT tasks. This prevents IPI storms,
* as having 10 CPUs scheduling lower priority tasks and 10 CPUs with
* RT overloaded tasks, would cause 100 IPIs to go out at once.
*
* The overloaded RT CPU, when receiving an IPI, will try to push off its
* overloaded RT tasks and then send an IPI to the next CPU that has
* overloaded RT tasks. This stops when all CPUs with overloaded RT tasks
* have completed. Just because a CPU may have pushed off its own overloaded
* RT task does not mean it should stop sending the IPI around to other
* overloaded CPUs. There may be another RT task waiting to run on one of
* those CPUs that are of higher priority than the one that was just
* pushed.
*
* An optimization that could possibly be made is to make a CPU array similar
* to the cpupri array mask of all running RT tasks, but for the overloaded
* case, then the IPI could be sent to only the CPU with the highest priority
* RT task waiting, and that CPU could send off further IPIs to the CPU with
* the next highest waiting task. Since the overloaded case is much less likely
* to happen, the complexity of this implementation may not be worth it.
* Instead, just send an IPI around to all overloaded CPUs.
*
* The rq->rt.push_flags holds the status of the IPI that is going around.
* A run queue can only send out a single IPI at a time. The possible flags
* for rq->rt.push_flags are:
*
* (None or zero): No IPI is going around for the current rq
* RT_PUSH_IPI_EXECUTING: An IPI for the rq is being passed around
* RT_PUSH_IPI_RESTART: The priority of the running task for the rq
* has changed, and the IPI should restart
* circulating the overloaded CPUs again.
*
* rq->rt.push_cpu contains the CPU that is being sent the IPI. It is updated
* before sending to the next CPU.
*
* Instead of having all CPUs that schedule a lower priority task send
* an IPI to the same "first" CPU in the RT overload mask, they send it
* to the next overloaded CPU after their own CPU. This helps distribute
* the work when there's more than one overloaded CPU and multiple CPUs
* scheduling in lower priority tasks.
*
* When a rq schedules a lower priority task than what was currently
* running, the next CPU with overloaded RT tasks is examined first.
* That is, if CPU 1 and 5 are overloaded, and CPU 3 schedules a lower
* priority task, it will send an IPI first to CPU 5, then CPU 5 will
* send to CPU 1 if it is still overloaded. CPU 1 will clear the
* rq->rt.push_flags if RT_PUSH_IPI_RESTART is not set.
*
* The first CPU to notice IPI_RESTART is set, will clear that flag and then
* send an IPI to the next overloaded CPU after the rq->cpu and not the next
* CPU after push_cpu. That is, if CPU 1, 4 and 5 are overloaded when CPU 3
* schedules a lower priority task, and the IPI_RESTART gets set while the
* handling is being done on CPU 5, it will clear the flag and send it back to
* CPU 4 instead of CPU 1.
*
* Note, the above logic can be disabled by turning off the sched_feature
* RT_PUSH_IPI. Then the rq lock of the overloaded CPU will simply be
* taken by the CPU requesting a pull and the waiting RT task will be pulled
* by that CPU. This may be fine for machines with few CPUs.
*/
static void tell_cpu_to_push(struct rq *rq) static void tell_cpu_to_push(struct rq *rq)
{ {
int cpu; int cpu;
......
/* Generated by Documentation/scheduler/sched-pelt; do not modify. */
static const u32 runnable_avg_yN_inv[] = {
0xffffffff, 0xfa83b2da, 0xf5257d14, 0xefe4b99a, 0xeac0c6e6, 0xe5b906e6,
0xe0ccdeeb, 0xdbfbb796, 0xd744fcc9, 0xd2a81d91, 0xce248c14, 0xc9b9bd85,
0xc5672a10, 0xc12c4cc9, 0xbd08a39e, 0xb8fbaf46, 0xb504f333, 0xb123f581,
0xad583ee9, 0xa9a15ab4, 0xa5fed6a9, 0xa2704302, 0x9ef5325f, 0x9b8d39b9,
0x9837f050, 0x94f4efa8, 0x91c3d373, 0x8ea4398a, 0x8b95c1e3, 0x88980e80,
0x85aac367, 0x82cd8698,
};
#define LOAD_AVG_PERIOD 32
#define LOAD_AVG_MAX 47742
...@@ -1331,15 +1331,17 @@ extern const u32 sched_prio_to_wmult[40]; ...@@ -1331,15 +1331,17 @@ extern const u32 sched_prio_to_wmult[40];
#define DEQUEUE_SLEEP 0x01 #define DEQUEUE_SLEEP 0x01
#define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */ #define DEQUEUE_SAVE 0x02 /* matches ENQUEUE_RESTORE */
#define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */ #define DEQUEUE_MOVE 0x04 /* matches ENQUEUE_MOVE */
#define DEQUEUE_NOCLOCK 0x08 /* matches ENQUEUE_NOCLOCK */
#define ENQUEUE_WAKEUP 0x01 #define ENQUEUE_WAKEUP 0x01
#define ENQUEUE_RESTORE 0x02 #define ENQUEUE_RESTORE 0x02
#define ENQUEUE_MOVE 0x04 #define ENQUEUE_MOVE 0x04
#define ENQUEUE_NOCLOCK 0x08
#define ENQUEUE_HEAD 0x08 #define ENQUEUE_HEAD 0x10
#define ENQUEUE_REPLENISH 0x10 #define ENQUEUE_REPLENISH 0x20
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#define ENQUEUE_MIGRATED 0x20 #define ENQUEUE_MIGRATED 0x40
#else #else
#define ENQUEUE_MIGRATED 0x00 #define ENQUEUE_MIGRATED 0x00
#endif #endif
...@@ -1624,6 +1626,7 @@ static inline void sched_avg_update(struct rq *rq) { } ...@@ -1624,6 +1626,7 @@ static inline void sched_avg_update(struct rq *rq) { }
struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf) struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(rq->lock); __acquires(rq->lock);
struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf) struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
__acquires(p->pi_lock) __acquires(p->pi_lock)
__acquires(rq->lock); __acquires(rq->lock);
...@@ -1645,6 +1648,62 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf) ...@@ -1645,6 +1648,62 @@ task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags); raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
} }
static inline void
rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_lock_irqsave(&rq->lock, rf->flags);
rq_pin_lock(rq, rf);
}
static inline void
rq_lock_irq(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_lock_irq(&rq->lock);
rq_pin_lock(rq, rf);
}
static inline void
rq_lock(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_lock(&rq->lock);
rq_pin_lock(rq, rf);
}
static inline void
rq_relock(struct rq *rq, struct rq_flags *rf)
__acquires(rq->lock)
{
raw_spin_lock(&rq->lock);
rq_repin_lock(rq, rf);
}
static inline void
rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_unlock_irqrestore(&rq->lock, rf->flags);
}
static inline void
rq_unlock_irq(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_unlock_irq(&rq->lock);
}
static inline void
rq_unlock(struct rq *rq, struct rq_flags *rf)
__releases(rq->lock)
{
rq_unpin_lock(rq, rf);
raw_spin_unlock(&rq->lock);
}
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#ifdef CONFIG_PREEMPT #ifdef CONFIG_PREEMPT
......
...@@ -309,7 +309,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void) ...@@ -309,7 +309,7 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
account_irq_exit_time(current); account_irq_exit_time(current);
__local_bh_enable(SOFTIRQ_OFFSET); __local_bh_enable(SOFTIRQ_OFFSET);
WARN_ON_ONCE(in_interrupt()); WARN_ON_ONCE(in_interrupt());
tsk_restore_flags(current, old_flags, PF_MEMALLOC); current_restore_flags(old_flags, PF_MEMALLOC);
} }
asmlinkage __visible void do_softirq(void) asmlinkage __visible void do_softirq(void)
......
...@@ -4734,6 +4734,29 @@ long work_on_cpu(int cpu, long (*fn)(void *), void *arg) ...@@ -4734,6 +4734,29 @@ long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
return wfc.ret; return wfc.ret;
} }
EXPORT_SYMBOL_GPL(work_on_cpu); EXPORT_SYMBOL_GPL(work_on_cpu);
/**
* work_on_cpu_safe - run a function in thread context on a particular cpu
* @cpu: the cpu to run on
* @fn: the function to run
* @arg: the function argument
*
* Disables CPU hotplug and calls work_on_cpu(). The caller must not hold
* any locks which would prevent @fn from completing.
*
* Return: The value @fn returns.
*/
long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg)
{
long ret = -ENODEV;
get_online_cpus();
if (cpu_online(cpu))
ret = work_on_cpu(cpu, fn, arg);
put_online_cpus();
return ret;
}
EXPORT_SYMBOL_GPL(work_on_cpu_safe);
#endif /* CONFIG_SMP */ #endif /* CONFIG_SMP */
#ifdef CONFIG_FREEZER #ifdef CONFIG_FREEZER
......
...@@ -4243,7 +4243,7 @@ static int __netif_receive_skb(struct sk_buff *skb) ...@@ -4243,7 +4243,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
*/ */
current->flags |= PF_MEMALLOC; current->flags |= PF_MEMALLOC;
ret = __netif_receive_skb_core(skb, true); ret = __netif_receive_skb_core(skb, true);
tsk_restore_flags(current, pflags, PF_MEMALLOC); current_restore_flags(pflags, PF_MEMALLOC);
} else } else
ret = __netif_receive_skb_core(skb, false); ret = __netif_receive_skb_core(skb, false);
......
...@@ -325,7 +325,7 @@ int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) ...@@ -325,7 +325,7 @@ int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
current->flags |= PF_MEMALLOC; current->flags |= PF_MEMALLOC;
ret = sk->sk_backlog_rcv(sk, skb); ret = sk->sk_backlog_rcv(sk, skb);
tsk_restore_flags(current, pflags, PF_MEMALLOC); current_restore_flags(pflags, PF_MEMALLOC);
return ret; return ret;
} }
......
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