- 23 Aug, 2007 40 commits
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Suresh Siddha authored
Was playing with sched_smt_power_savings/sched_mc_power_savings and found out that while the scheduler domains are reconstructed when sysfs settings change, rebalance_domains() can get triggered with null domain on other cpus, which is setting next_balance to jiffies + 60*HZ. Resulting in no idle/busy balancing for 60 seconds. Fix this. Signed-off-by:
Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Suresh Siddha authored
On a four package system with HT - HT load balancing optimizations were broken. For example, if two tasks end up running on two logical threads of one of the packages, scheduler is not able to pull one of the tasks to a completely idle package. In this scenario, for nice-0 tasks, imbalance calculated by scheduler will be 512 and find_busiest_queue() will return 0 (as each cpu's load is 1024 > imbalance and has only one task running). Similarly MC scheduler optimizations also get fixed with this patch. [ mingo@elte.hu: restored fair balancing by increasing the fuzz and adding it back to the power decision, without the /2 factor. ] Signed-off-by: -
Christian Borntraeger authored
Fix the accounting regression for CONFIG_VIRT_CPU_ACCOUNTING. It reverts parts of commit b27f03d4 by converting fs/proc/array.c back to cputime_t. The new functions task_utime and task_stime now return cputime_t instead of clock_t. If CONFIG_VIRT_CPU_ACCOUTING is set, task->utime and task->stime are returned directly instead of using sum_exec_runtime. Patch is tested on s390x with and without VIRT_CPU_ACCOUTING as well as on i386. [ mingo@elte.hu: cleanups, comments. ] Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Eric W. Biederman authored
There are two remaining gotchas: - The directories have impossible permissions (writeable). - The ctl_name for the kernel directory is inconsistent with everything else. It should be CTL_KERN. Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com> Signed-off-by:
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Ingo Molnar authored
construct a more or less wall-clock time out of sched_clock(), by using ACPI-idle's existing knowledge about how much time we spent idling. This allows the rq clock to work around TSC-stops-in-C2, TSC-gets-corrupted-in-C3 type of problems. ( Besides the scheduler's statistics this also benefits blktrace and printk-timestamps as well. ) Furthermore, the precise before-C2/C3-sleep and after-C2/C3-wakeup callbacks allow the scheduler to get out the most of the period where the CPU has a reliable TSC. This results in slightly more precise task statistics. the ACPI bits were acked by Len. Signed-off-by:
Len Brown <len.brown@intel.com>
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Mel Gorman authored
The NUMA layer only supports NUMA policies for the highest zone. When ZONE_MOVABLE is configured with kernelcore=, the the highest zone becomes ZONE_MOVABLE. The result is that policies are only applied to allocations like anonymous pages and page cache allocated from ZONE_MOVABLE when the zone is used. This patch applies policies to the two highest zones when the highest zone is ZONE_MOVABLE. As ZONE_MOVABLE consists of pages from the highest "real" zone, it's always functionally equivalent. The patch has been tested on a variety of machines both NUMA and non-NUMA covering x86, x86_64 and ppc64. No abnormal results were seen in kernbench, tbench, dbench or hackbench. It passes regression tests from the numactl package with and without kernelcore= once numactl tests are patched to wait for vmstat counters to update. akpm: this is the nasty hack to fix NUMA mempolicies in the presence of ZONE_MOVABLE and kernelcore= in 2.6.23. Christoph says "For .24 either merge the mobility or get the other solution that Mel is working on. That solution would only use a single zonelist per node and filter on the fly. That may help performance and also help to make memory policies work better." Signed-off-by:
Mel Gorman <mel@csn.ul.ie> Acked-by:
Lee Schermerhorn <lee.schermerhorn@hp.com> Tested-by:
Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Yoichi Yuasa authored
au1100fb_fb_blank() should come before au1100fb_setmode(). drivers/video/au1100fb.c: In function 'au1100fb_setmode': drivers/video/au1100fb.c:211: error: implicit declaration of function 'au1100fb_fb_blank' Signed-off-by:
Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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Andrew Morton authored
drivers/video/console/newport_con.c: In function `newport_console_init': drivers/video/console/newport_con.c:743: warning: return makes integer from pointer without a cast Although one wonders whether that should have been -ENODEV... Cc: "Antonino A. Daplas" <adaplas@pol.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by:
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Andrew Morton authored
In file included from drivers/video/console/newport_con.c:16: include/linux/selection.h:16: warning: "struct tty_struct" declared inside parameter list include/linux/selection.h:16: warning: its scope is only this definition or declaration, which is probably not what you want Signed-off-by:
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Stephen Rothwell authored
This is the correct fix according to Paul Mackerras and allows an allyesconfig on PPC64 to build. Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Mackerras <paulus@samba.org> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by:
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Mathieu Desnoyers authored
Xen i386 xen-head.S fix sections mixup xen-head.S does not come back to the data section, leaving the text section as current section. It causes problems with a slightly enhanced DEBUG_RODATA that supports CONFIG_HOTPLUG and bringing a CPU up after the text has been marked read-only: reference to early_gdt_descr causes a page fault. Updates: - It should be using pushsection/popsection. - Actually, the push/popsections around the ELFNOTEs are redundant; ELFNOTE() does its own push/popsection to put things into the appropriate .note* section anyway. Signed-off-by:
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by:
Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Andi Kleen <ak@suse.de> Signed-off-by:
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Oleg Nesterov authored
de_thread: if (atomic_read(&oldsighand->count) <= 1) BUG_ON(atomic_read(&sig->count) != 1); This is not safe without the rmb() in between. The results of two correctly ordered __exit_signal()->atomic_dec_and_test()'s could be seen out of order on our CPU. The same is true for the "thread_group_empty()" case, __unhash_process()'s changes could be seen before atomic_dec_and_test(&sig->count). On some platforms (including i386) atomic_read() doesn't provide even the compiler barrier, in that case these checks are simply racy. Remove these BUG_ON()'s. Alternatively, we can do something like BUG_ON( ({ smp_rmb(); atomic_read(&sig->count) != 1; }) ); Signed-off-by:Oleg Nesterov <oleg@tv-sign.ru> Acked-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by:
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David Brownell authored
Minor tweaks to rtc-max6902: make it hotplug correctly, and fix a few space-before-tab whitespace botches. This driver has no current in-tree users, so the hotplug fix changes the driver name. Signed-off-by:
David Brownell <dbrownell@users.sourceforge.net> Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by:
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Christoph Lameter authored
Print a big fat warning and do what is necessary to continue if a node is marked as up (meaning either node is online (upstream) or node has memory (Andrew's tree)) but allocations from the node do not succeed. Signed-off-by:
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Christoph Lameter authored
SLUB is using atomic_read() for variables declared atomic_long_t. Switch to atomic_long_read(). Signed-off-by:
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Miguel Ojeda authored
This one-liner patch fixes a bug in drivers/auxdisplay/cfag12864b.c At cfag12864b_init(), the driver tries to kalloc some memory in the variable cfag12864b_cache. Then, as usual, it checks if the call failed. However, it checks cfag12864b_buffer instead. This patch changes the "cfag12864b_buffer" to "cfag12864b_cache" so the correct variable is checked. Signed-off-by:
Miguel Ojeda <maxextreme@gmail.com> Signed-off-by:
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Olof Johansson authored
Add PCI IDs for the onchip UARTs on PA Semi PWRficient. Signed-off-by:
Olof Johansson <olof@lixom.net> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Ian Kent authored
Due to inconsistent locking in the VFS between calls to lookup and revalidate deadlock can occur in the automounter. The inconsistency is that the directory inode mutex is held for both lookup and revalidate calls when called via lookup_hash whereas it is held only for lookup during a path walk. Consequently, if the mutex is held during a call to revalidate autofs4 can't release the mutex to callback the daemon as it can't know whether it owns the mutex. This situation happens when a process tries to create a directory within an automount and a second process also tries to create the same directory between the lookup and the mkdir. Since the first process has dropped the mutex for the daemon callback, the second process takes it during revalidate leading to deadlock between the autofs daemon and the second process when the daemon tries to create the mount point directory. After spending quite a bit of time trying to resolve this on more than one occassion, using rather complex and ulgy approaches, it turns out that just delaying the hashing of the dentry until the create operation works fine. Signed-off-by:
Ian Kent <raven@themaw.net> Signed-off-by:
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Jeff Dike authored
The previous patch which limited the number of sectors in a single request to a COWed device was correct in concept, but the limit was implemented in the wrong place. By putting it in ubd_add, it covered the cases where the COWing was specified on the command line. However, when the command line only has the COW file specified, the fact that it's a COW file isn't known until it's opened, so the limit is missed in these cases. This patch moves the sector limit from ubd_add to ubd_open_dev. Signed-off-by:
Jeff Dike <jdike@linux.intel.com> Cc: <stable@kernel.org> Signed-off-by:
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NeilBrown authored
When a raid1 array is reshaped (number of drives changed), the list of devices is compacted, so that slots for missing devices are filled with working devices from later slots. This requires the "rd%d" symlinks in sysfs to be updated. Signed-off-by:
Neil Brown <neilb@suse.de> Signed-off-by:
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NeilBrown authored
Commit 17571284 was slightly bad. If an array has a write-intent bitmap, and you remove a drive, then readd it, only the changed parts should be resynced. However after the above commit, this only works if the array has not been shut down and restarted. This is because it sets 'fullsync' at little more often than it should. This patch is more careful. Signed-off-by:
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Evgeniy Polyakov authored
In case bus master driver provided bogus value as its private data, search can be incorrect. Problem found by Adrian Bunk. Signed-off-by:
Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Adam Litke authored
It seems a simple mistake was made when converting follow_hugetlb_page() over to the VM_FAULT flags bitmasks (in "mm: fault feedback #2", commit 83c54070). By using the wrong bitmask, hugetlb_fault() failures are not being recognized. This results in an infinite loop whenever follow_hugetlb_page is involved in a failed fault. Signed-off-by:
Adam Litke <agl@us.ibm.com> Acked-by:
Nick Piggin <npiggin@suse.de> Signed-off-by:
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Paul Fulghum authored
Get module reference on open() by generic HDLC to prevent module from unloading while interface is active. Signed-off-by:
Paul Fulghum <paulkf@microgate.com> Signed-off-by:
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Siddha, Suresh B authored
Skip calling cache_free_alien() when the platform is not numa capable. This will avoid cache misses that happen while accessing slabp (which is per page memory reference) to get nodeid. Instead use a global variable to skip the call, which is mostly likely to be present in the cache. This gives a 0.8% performance boost with the database oltp workload on a quad-core SMP platform and by any means the number is not small :) Signed-off-by:
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Mijo Safradin authored
trivial change: fix warning Signed-off-by:
Mijo Safradin <safradin@de.ibm.com> Acked-by:
Christian Krafft <krafft@de.ibm.com> Signed-off-by:
Corey Minyard <cminyard@mvista.com> Signed-off-by:
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Oleg Nesterov authored
With this patch any thread can dequeue its own private signals via signalfd, even if it was created by another sub-thread. To do so, we pass "current" to dequeue_signal() if the caller is from the same thread group. This also fixes the scheduling of posix timers broken by the previous patch. If the caller doesn't belong to this thread group, we can't handle __SI_TIMER case properly anyway. Perhaps we should forbid the cross-process signalfd usage and convert ctx->tsk to ctx->sighand. Signed-off-by:
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Oleg Nesterov authored
dequeue_signal: if (__SI_TIMER) { spin_unlock(&tsk->sighand->siglock); do_schedule_next_timer(info); spin_lock(&tsk->sighand->siglock); } Unless tsk == curent, this is absolutely unsafe: nothing prevents tsk from exiting. If signalfd was passed to another process, do_schedule_next_timer() is just wrong. Add yet another "tsk == current" check into dequeue_signal(). This patch fixes an oopsable bug, but breaks the scheduling of posix timers if the shared __SI_TIMER signal was fetched via signalfd attached to another sub-thread. Mostly fixed by the next patch. Signed-off-by: -
Oleg Nesterov authored
sys_timer_create() sets ->it_process and unlocks ->siglock, then checks tmr->it_sigev_notify to define if get_task_struct() is needed. We already passed ->it_id to the caller, another thread can delete this timer and free its memory in between. As a minimal fix, move this code under ->siglock, sys_timer_delete() takes it too before calling release_posix_timer(). A proper serialization would be to take ->it_lock, we add a partly initialized timer on posix_timers_id, not good. Signed-off-by:
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Thomas Gleixner authored
timer_delete does: lock_timer(); timer->it_process = NULL; unlock_timer(); release_posix_timer(); timer->it_process is checked in lock_timer() to prevent access to a timer, which is on the way to be deleted, but the check happens after idr_lock is dropped. This allows release_posix_timer() to delete the timer before the lock code can check the timer: CPU 0 CPU 1 lock_timer(); timer->it_process = NULL; unlock_timer(); lock_timer() spin_lock(idr_lock); timer = idr_find(); spin_lock(timer->lock); spin_unlock(idr_lock); release_posix_timer(); spin_lock(idr_lock); idr_remove(timer); spin_unlock(idr_lock); free_timer(timer); if (timer->......) Change the locking to prevent this. Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Geert Uytterhoeven authored
Introduce CONFIG_CHECK_SIGNATURE to control inclusion of check_signature() and avoid problems on platforms that don't have readb(). Let the few legacy (ISA || PCI || X86) drivers that need check_signature() select CONFIG_CHECK_SIGNATURE. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Geert Uytterhoeven authored
m68k/mac: Make mac_hid_mouse_emulate_buttons() declaration visible drivers/char/keyboard.c: In function 'kbd_keycode': drivers/char/keyboard.c:1142: error: implicit declaration of function 'mac_hid_mouse_emulate_buttons' The forward declaration of mac_hid_mouse_emulate_buttons() is not visible on m68k because it's hidden in the middle of a big #ifdef block. Move it to <linux/kbd_kern.h>, correct the type of the second parameter, and include <linux/kbd_kern.h> where needed. Signed-off-by:
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Geert Uytterhoeven authored
zorro: Make the sysfs `config' attribute read-only, as you cannot write to it (there's no .write function neither). Signed-off-by:
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Geert Uytterhoeven authored
m68k: Fix a few hickups in drivers/scsi/Kconfig Signed-off-by:
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Roman Zippel authored
Don't include RODATA into text segment as it includes the kallsyms data and can cause spurious link failures (layout differences can change the number of symbols in kallsyms, i.e. when a symbol is equal to _etext it's not included). Signed-off-by:
Roman Zippel <zippel@linux-m68k.org> Signed-off-by:
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Alan Cox authored
Add the needed constants and defines to activate the existing code. Signed-off-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Geert Uytterhoeven authored
m68k: Use _AC() instead of #ifdef __ASSEMBLY__ hackery when needed, remove hackery when unused. Signed-off-by:
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Johannes Berg authored
When suspend is ever implemented for pmu68k it really should follow the generic pm_ops concept and not mirror the platform-specific /dev/pmu device with ioctls on it. Hence, this patch removes the unused code there; should the implementers need it they can look at via-pmu.c and/or the history of the file. Signed-off-by:
Johannes Berg <johannes@sipsolutions.net> Signed-off-by:
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Roman Zippel authored
Remove an unnecessary m68k_memoffset export and initialization Signed-off-by:
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Geert Uytterhoeven authored
Kill a superfluous extern declaration Signed-off-by:
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