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Commit d2852b93 authored by Robert Richter's avatar Robert Richter
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Merge branch 'oprofile/ring_buffer' into oprofile/oprofile-for-tip

parents 4a6908a3 14f0ca8e
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Showing with 566 additions and 465 deletions
arch/Kconfig
View file @ d2852b93
......@@ -6,6 +6,8 @@ config OPROFILE
tristate "OProfile system profiling (EXPERIMENTAL)"
depends on PROFILING
depends on HAVE_OPROFILE
select TRACING
select RING_BUFFER
help
OProfile is a profiling system capable of profiling the
whole system, include the kernel, kernel modules, libraries,
......
arch/x86/oprofile/op_model_amd.c
View file @ d2852b93
......@@ -2,7 +2,7 @@
* @file op_model_amd.c
* athlon / K7 / K8 / Family 10h model-specific MSR operations
*
* @remark Copyright 2002-2008 OProfile authors
* @remark Copyright 2002-2009 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon
......@@ -10,7 +10,7 @@
* @author Graydon Hoare
* @author Robert Richter <robert.richter@amd.com>
* @author Barry Kasindorf
*/
*/
#include <linux/oprofile.h>
#include <linux/device.h>
......@@ -60,56 +60,10 @@ static unsigned long reset_value[NUM_COUNTERS];
#define IBS_OP_LOW_VALID_BIT (1ULL<<18) /* bit 18 */
#define IBS_OP_LOW_ENABLE (1ULL<<17) /* bit 17 */
/* Codes used in cpu_buffer.c */
/* This produces duplicate code, need to be fixed */
#define IBS_FETCH_BEGIN 3
#define IBS_OP_BEGIN 4
/* The function interface needs to be fixed, something like add
data. Should then be added to linux/oprofile.h. */
extern void
oprofile_add_ibs_sample(struct pt_regs *const regs,
unsigned int *const ibs_sample, int ibs_code);
struct ibs_fetch_sample {
/* MSRC001_1031 IBS Fetch Linear Address Register */
unsigned int ibs_fetch_lin_addr_low;
unsigned int ibs_fetch_lin_addr_high;
/* MSRC001_1030 IBS Fetch Control Register */
unsigned int ibs_fetch_ctl_low;
unsigned int ibs_fetch_ctl_high;
/* MSRC001_1032 IBS Fetch Physical Address Register */
unsigned int ibs_fetch_phys_addr_low;
unsigned int ibs_fetch_phys_addr_high;
};
struct ibs_op_sample {
/* MSRC001_1034 IBS Op Logical Address Register (IbsRIP) */
unsigned int ibs_op_rip_low;
unsigned int ibs_op_rip_high;
/* MSRC001_1035 IBS Op Data Register */
unsigned int ibs_op_data1_low;
unsigned int ibs_op_data1_high;
/* MSRC001_1036 IBS Op Data 2 Register */
unsigned int ibs_op_data2_low;
unsigned int ibs_op_data2_high;
/* MSRC001_1037 IBS Op Data 3 Register */
unsigned int ibs_op_data3_low;
unsigned int ibs_op_data3_high;
/* MSRC001_1038 IBS DC Linear Address Register (IbsDcLinAd) */
unsigned int ibs_dc_linear_low;
unsigned int ibs_dc_linear_high;
/* MSRC001_1039 IBS DC Physical Address Register (IbsDcPhysAd) */
unsigned int ibs_dc_phys_low;
unsigned int ibs_dc_phys_high;
};
/*
* unitialize the APIC for the IBS interrupts if needed on AMD Family10h+
*/
static void clear_ibs_nmi(void);
#define IBS_FETCH_SIZE 6
#define IBS_OP_SIZE 12
static int ibs_allowed; /* AMD Family10h and later */
static int has_ibs; /* AMD Family10h and later */
struct op_ibs_config {
unsigned long op_enabled;
......@@ -200,31 +154,29 @@ static inline int
op_amd_handle_ibs(struct pt_regs * const regs,
struct op_msrs const * const msrs)
{
unsigned int low, high;
struct ibs_fetch_sample ibs_fetch;
struct ibs_op_sample ibs_op;
u32 low, high;
u64 msr;
struct op_entry entry;
if (!ibs_allowed)
if (!has_ibs)
return 1;
if (ibs_config.fetch_enabled) {
rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
if (high & IBS_FETCH_HIGH_VALID_BIT) {
ibs_fetch.ibs_fetch_ctl_high = high;
ibs_fetch.ibs_fetch_ctl_low = low;
rdmsr(MSR_AMD64_IBSFETCHLINAD, low, high);
ibs_fetch.ibs_fetch_lin_addr_high = high;
ibs_fetch.ibs_fetch_lin_addr_low = low;
rdmsr(MSR_AMD64_IBSFETCHPHYSAD, low, high);
ibs_fetch.ibs_fetch_phys_addr_high = high;
ibs_fetch.ibs_fetch_phys_addr_low = low;
oprofile_add_ibs_sample(regs,
(unsigned int *)&ibs_fetch,
IBS_FETCH_BEGIN);
/*reenable the IRQ */
rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
rdmsrl(MSR_AMD64_IBSFETCHLINAD, msr);
oprofile_write_reserve(&entry, regs, msr,
IBS_FETCH_CODE, IBS_FETCH_SIZE);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
oprofile_add_data(&entry, low);
oprofile_add_data(&entry, high);
rdmsrl(MSR_AMD64_IBSFETCHPHYSAD, msr);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
oprofile_write_commit(&entry);
/* reenable the IRQ */
high &= ~IBS_FETCH_HIGH_VALID_BIT;
high |= IBS_FETCH_HIGH_ENABLE;
low &= IBS_FETCH_LOW_MAX_CNT_MASK;
......@@ -235,30 +187,29 @@ op_amd_handle_ibs(struct pt_regs * const regs,
if (ibs_config.op_enabled) {
rdmsr(MSR_AMD64_IBSOPCTL, low, high);
if (low & IBS_OP_LOW_VALID_BIT) {
rdmsr(MSR_AMD64_IBSOPRIP, low, high);
ibs_op.ibs_op_rip_low = low;
ibs_op.ibs_op_rip_high = high;
rdmsr(MSR_AMD64_IBSOPDATA, low, high);
ibs_op.ibs_op_data1_low = low;
ibs_op.ibs_op_data1_high = high;
rdmsr(MSR_AMD64_IBSOPDATA2, low, high);
ibs_op.ibs_op_data2_low = low;
ibs_op.ibs_op_data2_high = high;
rdmsr(MSR_AMD64_IBSOPDATA3, low, high);
ibs_op.ibs_op_data3_low = low;
ibs_op.ibs_op_data3_high = high;
rdmsr(MSR_AMD64_IBSDCLINAD, low, high);
ibs_op.ibs_dc_linear_low = low;
ibs_op.ibs_dc_linear_high = high;
rdmsr(MSR_AMD64_IBSDCPHYSAD, low, high);
ibs_op.ibs_dc_phys_low = low;
ibs_op.ibs_dc_phys_high = high;
rdmsrl(MSR_AMD64_IBSOPRIP, msr);
oprofile_write_reserve(&entry, regs, msr,
IBS_OP_CODE, IBS_OP_SIZE);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
rdmsrl(MSR_AMD64_IBSOPDATA, msr);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
rdmsrl(MSR_AMD64_IBSOPDATA2, msr);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
rdmsrl(MSR_AMD64_IBSOPDATA3, msr);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
rdmsrl(MSR_AMD64_IBSDCLINAD, msr);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
rdmsrl(MSR_AMD64_IBSDCPHYSAD, msr);
oprofile_add_data(&entry, (u32)msr);
oprofile_add_data(&entry, (u32)(msr >> 32));
oprofile_write_commit(&entry);
/* reenable the IRQ */
oprofile_add_ibs_sample(regs,
(unsigned int *)&ibs_op,
IBS_OP_BEGIN);
rdmsr(MSR_AMD64_IBSOPCTL, low, high);
high = 0;
low &= ~IBS_OP_LOW_VALID_BIT;
low |= IBS_OP_LOW_ENABLE;
......@@ -308,14 +259,14 @@ static void op_amd_start(struct op_msrs const * const msrs)
}
#ifdef CONFIG_OPROFILE_IBS
if (ibs_allowed && ibs_config.fetch_enabled) {
if (has_ibs && ibs_config.fetch_enabled) {
low = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
high = ((ibs_config.rand_en & 0x1) << 25) /* bit 57 */
+ IBS_FETCH_HIGH_ENABLE;
wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
}
if (ibs_allowed && ibs_config.op_enabled) {
if (has_ibs && ibs_config.op_enabled) {
low = ((ibs_config.max_cnt_op >> 4) & 0xFFFF)
+ ((ibs_config.dispatched_ops & 0x1) << 19) /* bit 19 */
+ IBS_OP_LOW_ENABLE;
......@@ -331,8 +282,10 @@ static void op_amd_stop(struct op_msrs const * const msrs)
unsigned int low, high;
int i;
/* Subtle: stop on all counters to avoid race with
* setting our pm callback */
/*
* Subtle: stop on all counters to avoid race with setting our
* pm callback
*/
for (i = 0 ; i < NUM_COUNTERS ; ++i) {
if (!reset_value[i])
continue;
......@@ -342,14 +295,16 @@ static void op_amd_stop(struct op_msrs const * const msrs)
}
#ifdef CONFIG_OPROFILE_IBS
if (ibs_allowed && ibs_config.fetch_enabled) {
low = 0; /* clear max count and enable */
if (has_ibs && ibs_config.fetch_enabled) {
/* clear max count and enable */
low = 0;
high = 0;
wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
}
if (ibs_allowed && ibs_config.op_enabled) {
low = 0; /* clear max count and enable */
if (has_ibs && ibs_config.op_enabled) {
/* clear max count and enable */
low = 0;
high = 0;
wrmsr(MSR_AMD64_IBSOPCTL, low, high);
}
......@@ -370,18 +325,7 @@ static void op_amd_shutdown(struct op_msrs const * const msrs)
}
}
#ifndef CONFIG_OPROFILE_IBS
/* no IBS support */
static int op_amd_init(struct oprofile_operations *ops)
{
return 0;
}
static void op_amd_exit(void) {}
#else
#ifdef CONFIG_OPROFILE_IBS
static u8 ibs_eilvt_off;
......@@ -395,7 +339,7 @@ static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
}
static int pfm_amd64_setup_eilvt(void)
static int init_ibs_nmi(void)
{
#define IBSCTL_LVTOFFSETVAL (1 << 8)
#define IBSCTL 0x1cc
......@@ -419,6 +363,7 @@ static int pfm_amd64_setup_eilvt(void)
| IBSCTL_LVTOFFSETVAL);
pci_read_config_dword(cpu_cfg, IBSCTL, &value);
if (value != (ibs_eilvt_off | IBSCTL_LVTOFFSETVAL)) {
pci_dev_put(cpu_cfg);
printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
"IBSCTL = 0x%08x", value);
return 1;
......@@ -443,33 +388,35 @@ static int pfm_amd64_setup_eilvt(void)
return 0;
}
/*
* initialize the APIC for the IBS interrupts
* if available (AMD Family10h rev B0 and later)
*/
static void setup_ibs(void)
/* uninitialize the APIC for the IBS interrupts if needed */
static void clear_ibs_nmi(void)
{
ibs_allowed = boot_cpu_has(X86_FEATURE_IBS);
if (has_ibs)
on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
}
/* initialize the APIC for the IBS interrupts if available */
static void ibs_init(void)
{
has_ibs = boot_cpu_has(X86_FEATURE_IBS);
if (!ibs_allowed)
if (!has_ibs)
return;
if (pfm_amd64_setup_eilvt()) {
ibs_allowed = 0;
if (init_ibs_nmi()) {
has_ibs = 0;
return;
}
printk(KERN_INFO "oprofile: AMD IBS detected\n");
}
/*
* unitialize the APIC for the IBS interrupts if needed on AMD Family10h
* rev B0 and later */
static void clear_ibs_nmi(void)
static void ibs_exit(void)
{
if (ibs_allowed)
on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
if (!has_ibs)
return;
clear_ibs_nmi();
}
static int (*create_arch_files)(struct super_block *sb, struct dentry *root);
......@@ -486,7 +433,7 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
if (ret)
return ret;
if (!ibs_allowed)
if (!has_ibs)
return ret;
/* model specific files */
......@@ -519,7 +466,7 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
static int op_amd_init(struct oprofile_operations *ops)
{
setup_ibs();
ibs_init();
create_arch_files = ops->create_files;
ops->create_files = setup_ibs_files;
return 0;
......@@ -527,10 +474,21 @@ static int op_amd_init(struct oprofile_operations *ops)
static void op_amd_exit(void)
{
clear_ibs_nmi();
ibs_exit();
}
#endif
#else
/* no IBS support */
static int op_amd_init(struct oprofile_operations *ops)
{
return 0;
}
static void op_amd_exit(void) {}
#endif /* CONFIG_OPROFILE_IBS */
struct op_x86_model_spec const op_amd_spec = {
.init = op_amd_init,
......
drivers/oprofile/buffer_sync.c
View file @ d2852b93
/**
* @file buffer_sync.c
*
* @remark Copyright 2002 OProfile authors
* @remark Copyright 2002-2009 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
* @author Barry Kasindorf
* @author Robert Richter <robert.richter@amd.com>
*
* This is the core of the buffer management. Each
* CPU buffer is processed and entered into the
......@@ -268,18 +269,6 @@ lookup_dcookie(struct mm_struct *mm, unsigned long addr, off_t *offset)
return cookie;
}
static void increment_tail(struct oprofile_cpu_buffer *b)
{
unsigned long new_tail = b->tail_pos + 1;
rmb(); /* be sure fifo pointers are synchromized */
if (new_tail < b->buffer_size)
b->tail_pos = new_tail;
else
b->tail_pos = 0;
}
static unsigned long last_cookie = INVALID_COOKIE;
static void add_cpu_switch(int i)
......@@ -327,84 +316,73 @@ static void add_trace_begin(void)
add_event_entry(TRACE_BEGIN_CODE);
}
#ifdef CONFIG_OPROFILE_IBS
#define IBS_FETCH_CODE_SIZE 2
#define IBS_OP_CODE_SIZE 5
#define IBS_EIP(offset) \
(((struct op_sample *)&cpu_buf->buffer[(offset)])->eip)
#define IBS_EVENT(offset) \
(((struct op_sample *)&cpu_buf->buffer[(offset)])->event)
/*
* Add IBS fetch and op entries to event buffer
*/
static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
struct mm_struct *mm)
static void add_data(struct op_entry *entry, struct mm_struct *mm)
{
unsigned long rip;
int i, count;
unsigned long ibs_cookie = 0;
unsigned long code, pc, val;
unsigned long cookie;
off_t offset;
increment_tail(cpu_buf); /* move to RIP entry */
rip = IBS_EIP(cpu_buf->tail_pos);
#ifdef __LP64__
rip += IBS_EVENT(cpu_buf->tail_pos) << 32;
#endif
if (!op_cpu_buffer_get_data(entry, &code))
return;
if (!op_cpu_buffer_get_data(entry, &pc))
return;
if (!op_cpu_buffer_get_size(entry))
return;
if (mm) {
ibs_cookie = lookup_dcookie(mm, rip, &offset);
cookie = lookup_dcookie(mm, pc, &offset);
if (ibs_cookie == NO_COOKIE)
offset = rip;
if (ibs_cookie == INVALID_COOKIE) {
if (cookie == NO_COOKIE)
offset = pc;
if (cookie == INVALID_COOKIE) {
atomic_inc(&oprofile_stats.sample_lost_no_mapping);
offset = rip;
offset = pc;
}
if (ibs_cookie != last_cookie) {
add_cookie_switch(ibs_cookie);
last_cookie = ibs_cookie;
if (cookie != last_cookie) {
add_cookie_switch(cookie);
last_cookie = cookie;
}
} else
offset = rip;
offset = pc;
add_event_entry(ESCAPE_CODE);
add_event_entry(code);
add_event_entry(offset); /* Offset from Dcookie */
/* we send the Dcookie offset, but send the raw Linear Add also*/
add_event_entry(IBS_EIP(cpu_buf->tail_pos));
add_event_entry(IBS_EVENT(cpu_buf->tail_pos));
if (code == IBS_FETCH_CODE)
count = IBS_FETCH_CODE_SIZE; /*IBS FETCH is 2 int64s*/
else
count = IBS_OP_CODE_SIZE; /*IBS OP is 5 int64s*/
for (i = 0; i < count; i++) {
increment_tail(cpu_buf);
add_event_entry(IBS_EIP(cpu_buf->tail_pos));
add_event_entry(IBS_EVENT(cpu_buf->tail_pos));
}
while (op_cpu_buffer_get_data(entry, &val))
add_event_entry(val);
}
#endif
static void add_sample_entry(unsigned long offset, unsigned long event)
static inline void add_sample_entry(unsigned long offset, unsigned long event)
{
add_event_entry(offset);
add_event_entry(event);
}
static int add_us_sample(struct mm_struct *mm, struct op_sample *s)
/*
* Add a sample to the global event buffer. If possible the
* sample is converted into a persistent dentry/offset pair
* for later lookup from userspace. Return 0 on failure.
*/
static int
add_sample(struct mm_struct *mm, struct op_sample *s, int in_kernel)
{
unsigned long cookie;
off_t offset;
if (in_kernel) {
add_sample_entry(s->eip, s->event);
return 1;
}
/* add userspace sample */
if (!mm) {
atomic_inc(&oprofile_stats.sample_lost_no_mm);
return 0;
}
cookie = lookup_dcookie(mm, s->eip, &offset);
if (cookie == INVALID_COOKIE) {
......@@ -423,25 +401,6 @@ static int add_us_sample(struct mm_struct *mm, struct op_sample *s)
}
/* Add a sample to the global event buffer. If possible the
* sample is converted into a persistent dentry/offset pair
* for later lookup from userspace.
*/
static int
add_sample(struct mm_struct *mm, struct op_sample *s, int in_kernel)
{
if (in_kernel) {
add_sample_entry(s->eip, s->event);
return 1;
} else if (mm) {
return add_us_sample(mm, s);
} else {
atomic_inc(&oprofile_stats.sample_lost_no_mm);
}
return 0;
}
static void release_mm(struct mm_struct *mm)
{
if (!mm)
......@@ -466,33 +425,6 @@ static inline int is_code(unsigned long val)
}
/* "acquire" as many cpu buffer slots as we can */
static unsigned long get_slots(struct oprofile_cpu_buffer *b)
{
unsigned long head = b->head_pos;
unsigned long tail = b->tail_pos;
/*
* Subtle. This resets the persistent last_task
* and in_kernel values used for switching notes.
* BUT, there is a small window between reading
* head_pos, and this call, that means samples
* can appear at the new head position, but not
* be prefixed with the notes for switching
* kernel mode or a task switch. This small hole
* can lead to mis-attribution or samples where
* we don't know if it's in the kernel or not,
* at the start of an event buffer.
*/
cpu_buffer_reset(b);
if (head >= tail)
return head - tail;
return head + (b->buffer_size - tail);
}
/* Move tasks along towards death. Any tasks on dead_tasks
* will definitely have no remaining references in any
* CPU buffers at this point, because we use two lists,
......@@ -559,71 +491,72 @@ typedef enum {
*/
void sync_buffer(int cpu)
{
struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
struct mm_struct *mm = NULL;
struct mm_struct *oldmm;
unsigned long val;
struct task_struct *new;
unsigned long cookie = 0;
int in_kernel = 1;
sync_buffer_state state = sb_buffer_start;
#ifndef CONFIG_OPROFILE_IBS
unsigned int i;
unsigned long available;
#endif
unsigned long flags;
struct op_entry entry;
struct op_sample *sample;
mutex_lock(&buffer_mutex);
add_cpu_switch(cpu);
/* Remember, only we can modify tail_pos */
#ifndef CONFIG_OPROFILE_IBS
available = get_slots(cpu_buf);
op_cpu_buffer_reset(cpu);
available = op_cpu_buffer_entries(cpu);
for (i = 0; i < available; ++i) {
#else
while (get_slots(cpu_buf)) {
#endif
struct op_sample *s = &cpu_buf->buffer[cpu_buf->tail_pos];
sample = op_cpu_buffer_read_entry(&entry, cpu);
if (!sample)
break;
if (is_code(s->eip)) {
if (s->event <= CPU_IS_KERNEL) {
if (is_code(sample->eip)) {
flags = sample->event;
if (flags & TRACE_BEGIN) {
state = sb_bt_start;
add_trace_begin();
}
if (flags & KERNEL_CTX_SWITCH) {
/* kernel/userspace switch */
in_kernel = s->event;
in_kernel = flags & IS_KERNEL;
if (state == sb_buffer_start)
state = sb_sample_start;
add_kernel_ctx_switch(s->event);
} else if (s->event == CPU_TRACE_BEGIN) {
state = sb_bt_start;
add_trace_begin();
#ifdef CONFIG_OPROFILE_IBS
} else if (s->event == IBS_FETCH_BEGIN) {
state = sb_bt_start;
add_ibs_begin(cpu_buf, IBS_FETCH_CODE, mm);
} else if (s->event == IBS_OP_BEGIN) {
state = sb_bt_start;
add_ibs_begin(cpu_buf, IBS_OP_CODE, mm);
#endif
} else {
struct mm_struct *oldmm = mm;
add_kernel_ctx_switch(flags & IS_KERNEL);
}
if (flags & USER_CTX_SWITCH
&& op_cpu_buffer_get_data(&entry, &val)) {
/* userspace context switch */
new = (struct task_struct *)s->event;
new = (struct task_struct *)val;
oldmm = mm;
release_mm(oldmm);
mm = take_tasks_mm(new);
if (mm != oldmm)
cookie = get_exec_dcookie(mm);
add_user_ctx_switch(new, cookie);
}
} else if (state >= sb_bt_start &&
!add_sample(mm, s, in_kernel)) {
if (state == sb_bt_start) {
state = sb_bt_ignore;
atomic_inc(&oprofile_stats.bt_lost_no_mapping);
}
if (op_cpu_buffer_get_size(&entry))
add_data(&entry, mm);
continue;
}
increment_tail(cpu_buf);
if (state < sb_bt_start)
/* ignore sample */
continue;
if (add_sample(mm, sample, in_kernel))
continue;
/* ignore backtraces if failed to add a sample */
if (state == sb_bt_start) {
state = sb_bt_ignore;
atomic_inc(&oprofile_stats.bt_lost_no_mapping);
}
}
release_mm(mm);
......
drivers/oprofile/cpu_buffer.c
View file @ d2852b93
/**
* @file cpu_buffer.c
*
* @remark Copyright 2002 OProfile authors
* @remark Copyright 2002-2009 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
* @author Barry Kasindorf <barry.kasindorf@amd.com>
* @author Robert Richter <robert.richter@amd.com>
*
* Each CPU has a local buffer that stores PC value/event
* pairs. We also log context switches when we notice them.
......@@ -28,6 +29,25 @@
#include "buffer_sync.h"
#include "oprof.h"
#define OP_BUFFER_FLAGS 0
/*
* Read and write access is using spin locking. Thus, writing to the
* buffer by NMI handler (x86) could occur also during critical
* sections when reading the buffer. To avoid this, there are 2
* buffers for independent read and write access. Read access is in
* process context only, write access only in the NMI handler. If the
* read buffer runs empty, both buffers are swapped atomically. There
* is potentially a small window during swapping where the buffers are
* disabled and samples could be lost.
*
* Using 2 buffers is a little bit overhead, but the solution is clear
* and does not require changes in the ring buffer implementation. It
* can be changed to a single buffer solution when the ring buffer
* access is implemented as non-locking atomic code.
*/
static struct ring_buffer *op_ring_buffer_read;
static struct ring_buffer *op_ring_buffer_write;
DEFINE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
static void wq_sync_buffer(struct work_struct *work);
......@@ -35,19 +55,9 @@ static void wq_sync_buffer(struct work_struct *work);
#define DEFAULT_TIMER_EXPIRE (HZ / 10)
static int work_enabled;
void free_cpu_buffers(void)
{
int i;
for_each_possible_cpu(i) {
vfree(per_cpu(cpu_buffer, i).buffer);
per_cpu(cpu_buffer, i).buffer = NULL;
}
}
unsigned long oprofile_get_cpu_buffer_size(void)
{
return fs_cpu_buffer_size;
return oprofile_cpu_buffer_size;
}
void oprofile_cpu_buffer_inc_smpl_lost(void)
......@@ -58,26 +68,36 @@ void oprofile_cpu_buffer_inc_smpl_lost(void)
cpu_buf->sample_lost_overflow++;
}
void free_cpu_buffers(void)
{
if (op_ring_buffer_read)
ring_buffer_free(op_ring_buffer_read);
op_ring_buffer_read = NULL;
if (op_ring_buffer_write)
ring_buffer_free(op_ring_buffer_write);
op_ring_buffer_write = NULL;
}
int alloc_cpu_buffers(void)
{
int i;
unsigned long buffer_size = fs_cpu_buffer_size;
unsigned long buffer_size = oprofile_cpu_buffer_size;
op_ring_buffer_read = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
if (!op_ring_buffer_read)
goto fail;
op_ring_buffer_write = ring_buffer_alloc(buffer_size, OP_BUFFER_FLAGS);
if (!op_ring_buffer_write)
goto fail;
for_each_possible_cpu(i) {
struct oprofile_cpu_buffer *b = &per_cpu(cpu_buffer, i);
b->buffer = vmalloc_node(sizeof(struct op_sample) * buffer_size,
cpu_to_node(i));
if (!b->buffer)
goto fail;
b->last_task = NULL;
b->last_is_kernel = -1;
b->tracing = 0;
b->buffer_size = buffer_size;
b->tail_pos = 0;
b->head_pos = 0;
b->sample_received = 0;
b->sample_lost_overflow = 0;
b->backtrace_aborted = 0;
......@@ -124,73 +144,156 @@ void end_cpu_work(void)
flush_scheduled_work();
}
/* Resets the cpu buffer to a sane state. */
void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf)
/*
* This function prepares the cpu buffer to write a sample.
*
* Struct op_entry is used during operations on the ring buffer while
* struct op_sample contains the data that is stored in the ring
* buffer. Struct entry can be uninitialized. The function reserves a
* data array that is specified by size. Use
* op_cpu_buffer_write_commit() after preparing the sample. In case of
* errors a null pointer is returned, otherwise the pointer to the
* sample.
*
*/
struct op_sample
*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size)
{
/* reset these to invalid values; the next sample
* collected will populate the buffer with proper
* values to initialize the buffer
*/
cpu_buf->last_is_kernel = -1;
cpu_buf->last_task = NULL;
entry->event = ring_buffer_lock_reserve
(op_ring_buffer_write, sizeof(struct op_sample) +
size * sizeof(entry->sample->data[0]), &entry->irq_flags);
if (entry->event)
entry->sample = ring_buffer_event_data(entry->event);
else
entry->sample = NULL;
if (!entry->sample)
return NULL;
entry->size = size;
entry->data = entry->sample->data;
return entry->sample;
}
/* compute number of available slots in cpu_buffer queue */
static unsigned long nr_available_slots(struct oprofile_cpu_buffer const *b)
int op_cpu_buffer_write_commit(struct op_entry *entry)
{
unsigned long head = b->head_pos;
unsigned long tail = b->tail_pos;
return ring_buffer_unlock_commit(op_ring_buffer_write, entry->event,
entry->irq_flags);
}
if (tail > head)
return (tail - head) - 1;
struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu)
{
struct ring_buffer_event *e;
e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
if (e)
goto event;
if (ring_buffer_swap_cpu(op_ring_buffer_read,
op_ring_buffer_write,
cpu))
return NULL;
e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
if (e)
goto event;
return NULL;
event:
entry->event = e;
entry->sample = ring_buffer_event_data(e);
entry->size = (ring_buffer_event_length(e) - sizeof(struct op_sample))
/ sizeof(entry->sample->data[0]);
entry->data = entry->sample->data;
return entry->sample;
}
return tail + (b->buffer_size - head) - 1;
unsigned long op_cpu_buffer_entries(int cpu)
{
return ring_buffer_entries_cpu(op_ring_buffer_read, cpu)
+ ring_buffer_entries_cpu(op_ring_buffer_write, cpu);
}
static void increment_head(struct oprofile_cpu_buffer *b)
static int
op_add_code(struct oprofile_cpu_buffer *cpu_buf, unsigned long backtrace,
int is_kernel, struct task_struct *task)
{
unsigned long new_head = b->head_pos + 1;
struct op_entry entry;
struct op_sample *sample;
unsigned long flags;
int size;
flags = 0;
/* Ensure anything written to the slot before we
* increment is visible */
wmb();
if (backtrace)
flags |= TRACE_BEGIN;
/* notice a switch from user->kernel or vice versa */
is_kernel = !!is_kernel;
if (cpu_buf->last_is_kernel != is_kernel) {
cpu_buf->last_is_kernel = is_kernel;
flags |= KERNEL_CTX_SWITCH;
if (is_kernel)
flags |= IS_KERNEL;
}
/* notice a task switch */
if (cpu_buf->last_task != task) {
cpu_buf->last_task = task;
flags |= USER_CTX_SWITCH;
}
if (!flags)
/* nothing to do */
return 0;
if (new_head < b->buffer_size)
b->head_pos = new_head;
if (flags & USER_CTX_SWITCH)
size = 1;
else
b->head_pos = 0;
}
size = 0;
static inline void
add_sample(struct oprofile_cpu_buffer *cpu_buf,
unsigned long pc, unsigned long event)
{
struct op_sample *entry = &cpu_buf->buffer[cpu_buf->head_pos];
entry->eip = pc;
entry->event = event;
increment_head(cpu_buf);
sample = op_cpu_buffer_write_reserve(&entry, size);
if (!sample)
return -ENOMEM;
sample->eip = ESCAPE_CODE;
sample->event = flags;
if (size)
op_cpu_buffer_add_data(&entry, (unsigned long)task);
op_cpu_buffer_write_commit(&entry);
return 0;
}
static inline void
add_code(struct oprofile_cpu_buffer *buffer, unsigned long value)
static inline int
op_add_sample(struct oprofile_cpu_buffer *cpu_buf,
unsigned long pc, unsigned long event)
{
add_sample(buffer, ESCAPE_CODE, value);
struct op_entry entry;
struct op_sample *sample;
sample = op_cpu_buffer_write_reserve(&entry, 0);
if (!sample)
return -ENOMEM;
sample->eip = pc;
sample->event = event;
return op_cpu_buffer_write_commit(&entry);
}
/* This must be safe from any context. It's safe writing here
* because of the head/tail separation of the writer and reader
* of the CPU buffer.
/*
* This must be safe from any context.
*
* is_kernel is needed because on some architectures you cannot
* tell if you are in kernel or user space simply by looking at
* pc. We tag this in the buffer by generating kernel enter/exit
* events whenever is_kernel changes
*/
static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
int is_kernel, unsigned long event)
static int
log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
unsigned long backtrace, int is_kernel, unsigned long event)
{
struct task_struct *task;
cpu_buf->sample_received++;
if (pc == ESCAPE_CODE) {
......@@ -198,131 +301,115 @@ static int log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
return 0;
}
if (nr_available_slots(cpu_buf) < 3) {
cpu_buf->sample_lost_overflow++;
return 0;
}
is_kernel = !!is_kernel;
if (op_add_code(cpu_buf, backtrace, is_kernel, current))
goto fail;
task = current;
if (op_add_sample(cpu_buf, pc, event))
goto fail;
/* notice a switch from user->kernel or vice versa */
if (cpu_buf->last_is_kernel != is_kernel) {
cpu_buf->last_is_kernel = is_kernel;
add_code(cpu_buf, is_kernel);
}
/* notice a task switch */
if (cpu_buf->last_task != task) {
cpu_buf->last_task = task;
add_code(cpu_buf, (unsigned long)task);
}
add_sample(cpu_buf, pc, event);
return 1;
fail:
cpu_buf->sample_lost_overflow++;
return 0;
}
static int oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
static inline void oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
{
if (nr_available_slots(cpu_buf) < 4) {
cpu_buf->sample_lost_overflow++;
return 0;
}
add_code(cpu_buf, CPU_TRACE_BEGIN);
cpu_buf->tracing = 1;
return 1;
}
static void oprofile_end_trace(struct oprofile_cpu_buffer *cpu_buf)
static inline void oprofile_end_trace(struct oprofile_cpu_buffer *cpu_buf)
{
cpu_buf->tracing = 0;
}
void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
unsigned long event, int is_kernel)
static inline void
__oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
unsigned long event, int is_kernel)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
unsigned long backtrace = oprofile_backtrace_depth;
if (!backtrace_depth) {
log_sample(cpu_buf, pc, is_kernel, event);
/*
* if log_sample() fail we can't backtrace since we lost the
* source of this event
*/
if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event))
/* failed */
return;
}
if (!oprofile_begin_trace(cpu_buf))
if (!backtrace)
return;
/* if log_sample() fail we can't backtrace since we lost the source
* of this event */
if (log_sample(cpu_buf, pc, is_kernel, event))
oprofile_ops.backtrace(regs, backtrace_depth);
oprofile_begin_trace(cpu_buf);
oprofile_ops.backtrace(regs, backtrace);
oprofile_end_trace(cpu_buf);
}
void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
unsigned long event, int is_kernel)
{
__oprofile_add_ext_sample(pc, regs, event, is_kernel);
}
void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
{
int is_kernel = !user_mode(regs);
unsigned long pc = profile_pc(regs);
oprofile_add_ext_sample(pc, regs, event, is_kernel);
__oprofile_add_ext_sample(pc, regs, event, is_kernel);
}
#ifdef CONFIG_OPROFILE_IBS
#define MAX_IBS_SAMPLE_SIZE 14
void oprofile_add_ibs_sample(struct pt_regs *const regs,
unsigned int *const ibs_sample, int ibs_code)
/*
* Add samples with data to the ring buffer.
*
* Use oprofile_add_data(&entry, val) to add data and
* oprofile_write_commit(&entry) to commit the sample.
*/
void
oprofile_write_reserve(struct op_entry *entry, struct pt_regs * const regs,
unsigned long pc, int code, int size)
{
struct op_sample *sample;
int is_kernel = !user_mode(regs);
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
struct task_struct *task;
cpu_buf->sample_received++;
if (nr_available_slots(cpu_buf) < MAX_IBS_SAMPLE_SIZE) {
/* we can't backtrace since we lost the source of this event */
cpu_buf->sample_lost_overflow++;
return;
}
/* no backtraces for samples with data */
if (op_add_code(cpu_buf, 0, is_kernel, current))
goto fail;
/* notice a switch from user->kernel or vice versa */
if (cpu_buf->last_is_kernel != is_kernel) {
cpu_buf->last_is_kernel = is_kernel;
add_code(cpu_buf, is_kernel);
}
sample = op_cpu_buffer_write_reserve(entry, size + 2);
if (!sample)
goto fail;
sample->eip = ESCAPE_CODE;
sample->event = 0; /* no flags */
/* notice a task switch */
if (!is_kernel) {
task = current;
if (cpu_buf->last_task != task) {
cpu_buf->last_task = task;
add_code(cpu_buf, (unsigned long)task);
}
}
op_cpu_buffer_add_data(entry, code);
op_cpu_buffer_add_data(entry, pc);
add_code(cpu_buf, ibs_code);
add_sample(cpu_buf, ibs_sample[0], ibs_sample[1]);
add_sample(cpu_buf, ibs_sample[2], ibs_sample[3]);
add_sample(cpu_buf, ibs_sample[4], ibs_sample[5]);
return;
if (ibs_code == IBS_OP_BEGIN) {
add_sample(cpu_buf, ibs_sample[6], ibs_sample[7]);
add_sample(cpu_buf, ibs_sample[8], ibs_sample[9]);
add_sample(cpu_buf, ibs_sample[10], ibs_sample[11]);
}
fail:
cpu_buf->sample_lost_overflow++;
}
if (backtrace_depth)
oprofile_ops.backtrace(regs, backtrace_depth);
int oprofile_add_data(struct op_entry *entry, unsigned long val)
{
return op_cpu_buffer_add_data(entry, val);
}
#endif
int oprofile_write_commit(struct op_entry *entry)
{
return op_cpu_buffer_write_commit(entry);
}
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
{
struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(cpu_buffer);
log_sample(cpu_buf, pc, is_kernel, event);
log_sample(cpu_buf, pc, 0, is_kernel, event);
}
void oprofile_add_trace(unsigned long pc)
......@@ -332,21 +419,21 @@ void oprofile_add_trace(unsigned long pc)
if (!cpu_buf->tracing)
return;
if (nr_available_slots(cpu_buf) < 1) {
cpu_buf->tracing = 0;
cpu_buf->sample_lost_overflow++;
return;
}
/*
* broken frame can give an eip with the same value as an
* escape code, abort the trace if we get it
*/
if (pc == ESCAPE_CODE)
goto fail;
/* broken frame can give an eip with the same value as an escape code,
* abort the trace if we get it */
if (pc == ESCAPE_CODE) {
cpu_buf->tracing = 0;
cpu_buf->backtrace_aborted++;
return;
}
if (op_add_sample(cpu_buf, pc, 0))
goto fail;
add_sample(cpu_buf, pc, 0);
return;
fail:
cpu_buf->tracing = 0;
cpu_buf->backtrace_aborted++;
return;
}
/*
......
drivers/oprofile/cpu_buffer.h
View file @ d2852b93
/**
* @file cpu_buffer.h
*
* @remark Copyright 2002 OProfile authors
* @remark Copyright 2002-2009 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon <levon@movementarian.org>
* @author Robert Richter <robert.richter@amd.com>
*/
#ifndef OPROFILE_CPU_BUFFER_H
......@@ -15,6 +16,7 @@
#include <linux/workqueue.h>
#include <linux/cache.h>
#include <linux/sched.h>
#include <linux/ring_buffer.h>
struct task_struct;
......@@ -30,16 +32,16 @@ void end_cpu_work(void);
struct op_sample {
unsigned long eip;
unsigned long event;
unsigned long data[0];
};
struct op_entry;
struct oprofile_cpu_buffer {
volatile unsigned long head_pos;
volatile unsigned long tail_pos;
unsigned long buffer_size;
struct task_struct *last_task;
int last_is_kernel;
int tracing;
struct op_sample *buffer;
unsigned long sample_received;
unsigned long sample_lost_overflow;
unsigned long backtrace_aborted;
......@@ -50,12 +52,62 @@ struct oprofile_cpu_buffer {
DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);
/*
* Resets the cpu buffer to a sane state.
*
* reset these to invalid values; the next sample collected will
* populate the buffer with proper values to initialize the buffer
*/
static inline void op_cpu_buffer_reset(int cpu)
{
struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
cpu_buf->last_is_kernel = -1;
cpu_buf->last_task = NULL;
}
struct op_sample
*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
int op_cpu_buffer_write_commit(struct op_entry *entry);
struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu);
unsigned long op_cpu_buffer_entries(int cpu);
/* returns the remaining free size of data in the entry */
static inline
int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val)
{
if (!entry->size)
return 0;
*entry->data = val;
entry->size--;
entry->data++;
return entry->size;
}
/* returns the size of data in the entry */
static inline
int op_cpu_buffer_get_size(struct op_entry *entry)
{
return entry->size;
}
/* returns 0 if empty or the size of data including the current value */
static inline
int op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val)
{
int size = entry->size;
if (!size)
return 0;
*val = *entry->data;
entry->size--;
entry->data++;
return size;
}
/* transient events for the CPU buffer -> event buffer */
#define CPU_IS_KERNEL 1
#define CPU_TRACE_BEGIN 2
#define IBS_FETCH_BEGIN 3
#define IBS_OP_BEGIN 4
/* extra data flags */
#define KERNEL_CTX_SWITCH (1UL << 0)
#define IS_KERNEL (1UL << 1)
#define TRACE_BEGIN (1UL << 2)
#define USER_CTX_SWITCH (1UL << 3)
#endif /* OPROFILE_CPU_BUFFER_H */
drivers/oprofile/event_buffer.c
View file @ d2852b93
......@@ -73,8 +73,8 @@ int alloc_event_buffer(void)
unsigned long flags;
spin_lock_irqsave(&oprofilefs_lock, flags);
buffer_size = fs_buffer_size;
buffer_watershed = fs_buffer_watershed;
buffer_size = oprofile_buffer_size;
buffer_watershed = oprofile_buffer_watershed;
spin_unlock_irqrestore(&oprofilefs_lock, flags);
if (buffer_watershed >= buffer_size)
......
drivers/oprofile/oprof.c
View file @ d2852b93
......@@ -23,7 +23,7 @@
struct oprofile_operations oprofile_ops;
unsigned long oprofile_started;
unsigned long backtrace_depth;
unsigned long oprofile_backtrace_depth;
static unsigned long is_setup;
static DEFINE_MUTEX(start_mutex);
......@@ -172,7 +172,7 @@ int oprofile_set_backtrace(unsigned long val)
goto out;
}
backtrace_depth = val;
oprofile_backtrace_depth = val;
out:
mutex_unlock(&start_mutex);
......
drivers/oprofile/oprof.h
View file @ d2852b93
......@@ -21,12 +21,12 @@ void oprofile_stop(void);
struct oprofile_operations;
extern unsigned long fs_buffer_size;
extern unsigned long fs_cpu_buffer_size;
extern unsigned long fs_buffer_watershed;
extern unsigned long oprofile_buffer_size;
extern unsigned long oprofile_cpu_buffer_size;
extern unsigned long oprofile_buffer_watershed;
extern struct oprofile_operations oprofile_ops;
extern unsigned long oprofile_started;
extern unsigned long backtrace_depth;
extern unsigned long oprofile_backtrace_depth;
struct super_block;
struct dentry;
......
drivers/oprofile/oprofile_files.c
View file @ d2852b93
......@@ -14,13 +14,18 @@
#include "oprofile_stats.h"
#include "oprof.h"
unsigned long fs_buffer_size = 131072;
unsigned long fs_cpu_buffer_size = 8192;
unsigned long fs_buffer_watershed = 32768; /* FIXME: tune */
#define BUFFER_SIZE_DEFAULT 131072
#define CPU_BUFFER_SIZE_DEFAULT 8192
#define BUFFER_WATERSHED_DEFAULT 32768 /* FIXME: tune */
unsigned long oprofile_buffer_size;
unsigned long oprofile_cpu_buffer_size;
unsigned long oprofile_buffer_watershed;
static ssize_t depth_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
return oprofilefs_ulong_to_user(backtrace_depth, buf, count, offset);
return oprofilefs_ulong_to_user(oprofile_backtrace_depth, buf, count,
offset);
}
......@@ -120,12 +125,17 @@ static const struct file_operations dump_fops = {
void oprofile_create_files(struct super_block *sb, struct dentry *root)
{
/* reinitialize default values */
oprofile_buffer_size = BUFFER_SIZE_DEFAULT;
oprofile_cpu_buffer_size = CPU_BUFFER_SIZE_DEFAULT;
oprofile_buffer_watershed = BUFFER_WATERSHED_DEFAULT;
oprofilefs_create_file(sb, root, "enable", &enable_fops);
oprofilefs_create_file_perm(sb, root, "dump", &dump_fops, 0666);
oprofilefs_create_file(sb, root, "buffer", &event_buffer_fops);
oprofilefs_create_ulong(sb, root, "buffer_size", &fs_buffer_size);
oprofilefs_create_ulong(sb, root, "buffer_watershed", &fs_buffer_watershed);
oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &fs_cpu_buffer_size);
oprofilefs_create_ulong(sb, root, "buffer_size", &oprofile_buffer_size);
oprofilefs_create_ulong(sb, root, "buffer_watershed", &oprofile_buffer_watershed);
oprofilefs_create_ulong(sb, root, "cpu_buffer_size", &oprofile_cpu_buffer_size);
oprofilefs_create_file(sb, root, "cpu_type", &cpu_type_fops);
oprofilefs_create_file(sb, root, "backtrace_depth", &depth_fops);
oprofilefs_create_file(sb, root, "pointer_size", &pointer_size_fops);
......
include/linux/oprofile.h
View file @ d2852b93
......@@ -86,8 +86,7 @@ int oprofile_arch_init(struct oprofile_operations * ops);
void oprofile_arch_exit(void);
/**
* Add a sample. This may be called from any context. Pass
* smp_processor_id() as cpu.
* Add a sample. This may be called from any context.
*/
void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
......@@ -165,4 +164,22 @@ void oprofile_put_buff(unsigned long *buf, unsigned int start,
unsigned long oprofile_get_cpu_buffer_size(void);
void oprofile_cpu_buffer_inc_smpl_lost(void);
/* cpu buffer functions */
struct op_sample;
struct op_entry {
struct ring_buffer_event *event;
struct op_sample *sample;
unsigned long irq_flags;
unsigned long size;
unsigned long *data;
};
void oprofile_write_reserve(struct op_entry *entry,
struct pt_regs * const regs,
unsigned long pc, int code, int size);
int oprofile_add_data(struct op_entry *entry, unsigned long val);
int oprofile_write_commit(struct op_entry *entry);
#endif /* OPROFILE_H */
include/linux/ring_buffer.h
View file @ d2852b93
......@@ -116,6 +116,8 @@ void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_entries(struct ring_buffer *buffer);
unsigned long ring_buffer_overruns(struct ring_buffer *buffer);
unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu);
unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
u64 ring_buffer_time_stamp(int cpu);
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
......
kernel/trace/ring_buffer.c
View file @ d2852b93
......@@ -31,6 +31,7 @@ void tracing_on(void)
{
ring_buffers_off = 0;
}
EXPORT_SYMBOL_GPL(tracing_on);
/**
* tracing_off - turn off all tracing buffers
......@@ -44,6 +45,7 @@ void tracing_off(void)
{
ring_buffers_off = 1;
}
EXPORT_SYMBOL_GPL(tracing_off);
/* Up this if you want to test the TIME_EXTENTS and normalization */
#define DEBUG_SHIFT 0
......@@ -60,12 +62,14 @@ u64 ring_buffer_time_stamp(int cpu)
return time;
}
EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
{
/* Just stupid testing the normalize function and deltas */
*ts >>= DEBUG_SHIFT;
}
EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
#define RB_ALIGNMENT_SHIFT 2
......@@ -113,8 +117,15 @@ rb_event_length(struct ring_buffer_event *event)
*/
unsigned ring_buffer_event_length(struct ring_buffer_event *event)
{
return rb_event_length(event);
unsigned length = rb_event_length(event);
if (event->type != RINGBUF_TYPE_DATA)
return length;
length -= RB_EVNT_HDR_SIZE;
if (length > RB_MAX_SMALL_DATA + sizeof(event->array[0]))
length -= sizeof(event->array[0]);
return length;
}
EXPORT_SYMBOL_GPL(ring_buffer_event_length);
/* inline for ring buffer fast paths */
static inline void *
......@@ -136,6 +147,7 @@ void *ring_buffer_event_data(struct ring_buffer_event *event)
{
return rb_event_data(event);
}
EXPORT_SYMBOL_GPL(ring_buffer_event_data);
#define for_each_buffer_cpu(buffer, cpu) \
for_each_cpu_mask(cpu, buffer->cpumask)
......@@ -381,7 +393,7 @@ extern int ring_buffer_page_too_big(void);
/**
* ring_buffer_alloc - allocate a new ring_buffer
* @size: the size in bytes that is needed.
* @size: the size in bytes per cpu that is needed.
* @flags: attributes to set for the ring buffer.
*
* Currently the only flag that is available is the RB_FL_OVERWRITE
......@@ -444,6 +456,7 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
kfree(buffer);
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_alloc);
/**
* ring_buffer_free - free a ring buffer.
......@@ -459,6 +472,7 @@ ring_buffer_free(struct ring_buffer *buffer)
kfree(buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_free);
static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
......@@ -620,6 +634,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
mutex_unlock(&buffer->mutex);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(ring_buffer_resize);
static inline int rb_null_event(struct ring_buffer_event *event)
{
......@@ -1220,6 +1235,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
preempt_enable_notrace();
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
......@@ -1269,6 +1285,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
return 0;
}
EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);
/**
* ring_buffer_write - write data to the buffer without reserving
......@@ -1334,6 +1351,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
return ret;
}
EXPORT_SYMBOL_GPL(ring_buffer_write);
static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
{
......@@ -1360,6 +1378,7 @@ void ring_buffer_record_disable(struct ring_buffer *buffer)
{
atomic_inc(&buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_disable);
/**
* ring_buffer_record_enable - enable writes to the buffer
......@@ -1372,6 +1391,7 @@ void ring_buffer_record_enable(struct ring_buffer *buffer)
{
atomic_dec(&buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_enable);
/**
* ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
......@@ -1393,6 +1413,7 @@ void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
atomic_inc(&cpu_buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_disable_cpu);
/**
* ring_buffer_record_enable_cpu - enable writes to the buffer
......@@ -1412,6 +1433,7 @@ void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
atomic_dec(&cpu_buffer->record_disabled);
}
EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
/**
* ring_buffer_entries_cpu - get the number of entries in a cpu buffer
......@@ -1428,6 +1450,7 @@ unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->entries;
}
EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
/**
* ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
......@@ -1444,6 +1467,7 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->overrun;
}
EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
/**
* ring_buffer_entries - get the number of entries in a buffer
......@@ -1466,6 +1490,7 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)
return entries;
}
EXPORT_SYMBOL_GPL(ring_buffer_entries);
/**
* ring_buffer_overrun_cpu - get the number of overruns in buffer
......@@ -1488,6 +1513,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer)
return overruns;
}
EXPORT_SYMBOL_GPL(ring_buffer_overruns);
/**
* ring_buffer_iter_reset - reset an iterator
......@@ -1513,6 +1539,7 @@ void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
else
iter->read_stamp = iter->head_page->time_stamp;
}
EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);
/**
* ring_buffer_iter_empty - check if an iterator has no more to read
......@@ -1527,6 +1554,7 @@ int ring_buffer_iter_empty(struct ring_buffer_iter *iter)
return iter->head_page == cpu_buffer->commit_page &&
iter->head == rb_commit_index(cpu_buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_iter_empty);
static void
rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
......@@ -1797,6 +1825,7 @@ ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_peek);
/**
* ring_buffer_iter_peek - peek at the next event to be read
......@@ -1867,6 +1896,7 @@ ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
return NULL;
}
EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
/**
* ring_buffer_consume - return an event and consume it
......@@ -1894,6 +1924,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
return event;
}
EXPORT_SYMBOL_GPL(ring_buffer_consume);
/**
* ring_buffer_read_start - start a non consuming read of the buffer
......@@ -1934,6 +1965,7 @@ ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
return iter;
}
EXPORT_SYMBOL_GPL(ring_buffer_read_start);
/**
* ring_buffer_finish - finish reading the iterator of the buffer
......@@ -1950,6 +1982,7 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
atomic_dec(&cpu_buffer->record_disabled);
kfree(iter);
}
EXPORT_SYMBOL_GPL(ring_buffer_read_finish);
/**
* ring_buffer_read - read the next item in the ring buffer by the iterator
......@@ -1971,6 +2004,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
return event;
}
EXPORT_SYMBOL_GPL(ring_buffer_read);
/**
* ring_buffer_size - return the size of the ring buffer (in bytes)
......@@ -1980,6 +2014,7 @@ unsigned long ring_buffer_size(struct ring_buffer *buffer)
{
return BUF_PAGE_SIZE * buffer->pages;
}
EXPORT_SYMBOL_GPL(ring_buffer_size);
static void
rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
......@@ -2022,6 +2057,7 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
spin_unlock_irqrestore(&cpu_buffer->lock, flags);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
/**
* ring_buffer_reset - reset a ring buffer
......@@ -2034,6 +2070,7 @@ void ring_buffer_reset(struct ring_buffer *buffer)
for_each_buffer_cpu(buffer, cpu)
ring_buffer_reset_cpu(buffer, cpu);
}
EXPORT_SYMBOL_GPL(ring_buffer_reset);
/**
* rind_buffer_empty - is the ring buffer empty?
......@@ -2052,6 +2089,7 @@ int ring_buffer_empty(struct ring_buffer *buffer)
}
return 1;
}
EXPORT_SYMBOL_GPL(ring_buffer_empty);
/**
* ring_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?
......@@ -2068,6 +2106,7 @@ int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
cpu_buffer = buffer->buffers[cpu];
return rb_per_cpu_empty(cpu_buffer);
}
EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);
/**
* ring_buffer_swap_cpu - swap a CPU buffer between two ring buffers
......@@ -2117,6 +2156,7 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
return 0;
}
EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
static ssize_t
rb_simple_read(struct file *filp, char __user *ubuf,
......
kernel/trace/trace.c
View file @ d2852b93
......@@ -914,7 +914,7 @@ enum trace_file_type {
TRACE_FILE_LAT_FMT = 1,
};
static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
static void trace_iterator_increment(struct trace_iterator *iter)
{
/* Don't allow ftrace to trace into the ring buffers */
ftrace_disable_cpu();
......@@ -993,7 +993,7 @@ static void *find_next_entry_inc(struct trace_iterator *iter)
iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts);
if (iter->ent)
trace_iterator_increment(iter, iter->cpu);
trace_iterator_increment(iter);
return iter->ent ? iter : NULL;
}
......
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