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* ntp: fix typo that makes sync_cmos_clock erraticDavid P. Reed2007-11-17
| | | | | | | | | | | | | | | | | | | | | | | | Fix a typo in ntp.c that has caused updating of the persistent (RTC) clock when synced to NTP to behave erratically. When debugging a freeze that arises on my AMD64 machines when I run the ntpd service, I added a number of printk's to monitor the sync_cmos_clock procedure. I discovered that it was not syncing to cmos RTC every 11 minutes as documented, but instead would keep trying every second for hours at a time. The reason turned out to be a typo in sync_cmos_clock, where it attempts to ensure that update_persistent_clock is called very close to 500 msec. after a 1 second boundary (required by the PC RTC's spec). That typo referred to "xtime" in one spot, rather than "now", which is derived from "xtime" but not equal to it. This makes the test erratic, creating a "coin-flip" that decides when update_persistent_clock is called - when it is called, which is rarely, it may be at any time during the one second period, rather than close to 500 msec, so the value written is needlessly incorrect, too. Signed-off-by: David P. Reed Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: ignore the sys_getcpu() tcache parameterIngo Molnar2007-11-17
| | | | | | | | | | | | | | | | | dont use the vgetcpu tcache - it's causing problems with tasks migrating, they'll see the old cache up to a jiffy after the migration, further increasing the costs of the migration. In the worst case they see a complete bogus information from the tcache, when a sys_getcpu() call "invalidated" the cache info by incrementing the jiffies _and_ the cpuid info in the cache and the following vdso_getcpu() call happens after vdso_jiffies have been incremented. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-schedLinus Torvalds2007-11-15
|\ | | | | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched: sched: reorder SCHED_FEAT_ bits sched: make sched_nr_latency static sched: remove activate_idle_task() sched: fix __set_task_cpu() SMP race sched: fix SCHED_FIFO tasks & FAIR_GROUP_SCHED sched: fix accounting of interrupts during guest execution on s390
| * sched: reorder SCHED_FEAT_ bitsIngo Molnar2007-11-15
| | | | | | | | | | | | | | reorder SCHED_FEAT_ bits so that the used ones come first. Makes tuning instructions easier. Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * sched: make sched_nr_latency staticAdrian Bunk2007-11-15
| | | | | | | | | | | | | | sched_nr_latency can now become static. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * sched: remove activate_idle_task()Dmitry Adamushko2007-11-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | cpu_down() code is ok wrt sched_idle_next() placing the 'idle' task not at the beginning of the queue. So get rid of activate_idle_task() and make use of activate_task() instead. It is the same as activate_task(), except for the update_rq_clock(rq) call that is redundant. Code size goes down: text data bss dec hex filename 47853 3934 336 52123 cb9b sched.o.before 47828 3934 336 52098 cb82 sched.o.after Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * sched: fix __set_task_cpu() SMP raceDmitry Adamushko2007-11-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Grant Wilson has reported rare SCHED_FAIR_USER crashes on his quad-core system, which crashes can only be explained via runqueue corruption. there is a narrow SMP race in __set_task_cpu(): after ->cpu is set up to a new value, task_rq_lock(p, ...) can be successfuly executed on another CPU. We must ensure that updates of per-task data have been completed by this moment. this bug has been hiding in the Linux scheduler for an eternity (we never had any explicit barrier for task->cpu in set_task_cpu() - so the bug was introduced in 2.5.1), but only became visible via set_task_cfs_rq() being accidentally put after the task->cpu update. It also probably needs a sufficiently out-of-order CPU to trigger. Reported-by: Grant Wilson <grant.wilson@zen.co.uk> Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * sched: fix SCHED_FIFO tasks & FAIR_GROUP_SCHEDOleg Nesterov2007-11-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Suppose that the SCHED_FIFO task does switch_uid(new_user); Now, p->se.cfs_rq and p->se.parent both point into the old user_struct->tg because sched_move_task() doesn't call set_task_cfs_rq() for !fair_sched_class case. Suppose that old user_struct/task_group is freed/reused, and the task does sched_setscheduler(SCHED_NORMAL); __setscheduler() sets fair_sched_class, but doesn't update ->se.cfs_rq/parent which point to the freed memory. This means that check_preempt_wakeup() doing while (!is_same_group(se, pse)) { se = parent_entity(se); pse = parent_entity(pse); } may OOPS in a similar way if rq->curr or p did something like above. Perhaps we need something like the patch below, note that __setscheduler() can't do set_task_cfs_rq(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * sched: fix accounting of interrupts during guest execution on s390Christian Borntraeger2007-11-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the scheduler checks for PF_VCPU to decide if this timeslice has to be accounted as guest time. On s390 host interrupts are not disabled during guest execution. This causes theses interrupts to be accounted as guest time if CONFIG_VIRT_CPU_ACCOUNTING is set. Solution is to check if an interrupt triggered account_system_time. As the tick is timer interrupt based, we have to subtract hardirq_offset. I tested the patch on s390 with CONFIG_VIRT_CPU_ACCOUNTING and on x86_64. Seems to work. CC: Avi Kivity <avi@qumranet.com> CC: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | wait_task_stopped: Check p->exit_state instead of TASK_TRACEDRoland McGrath2007-11-15
|/ | | | | | | | | | | | | | | | The original meaning of the old test (p->state > TASK_STOPPED) was "not dead", since it was before TASK_TRACED existed and before the state/exit_state split. It was a wrong correction in commit 14bf01bb0599c89fc7f426d20353b76e12555308 to make this test for TASK_TRACED instead. It should have been changed when TASK_TRACED was introducted and again when exit_state was introduced. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Alexey Dobriyan <adobriyan@sw.ru> Cc: Kees Cook <kees@ubuntu.com> Acked-by: Scott James Remnant <scott@ubuntu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'master' of ↵Linus Torvalds2007-11-14
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 * 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: [NET]: rt_check_expire() can take a long time, add a cond_resched() [ISDN] sc: Really, really fix warning [ISDN] sc: Fix sndpkt to have the correct number of arguments [TCP] FRTO: Clear frto_highmark only after process_frto that uses it [NET]: Remove notifier block from chain when register_netdevice_notifier fails [FS_ENET]: Fix module build. [TCP]: Make sure write_queue_from does not begin with NULL ptr [TCP]: Fix size calculation in sk_stream_alloc_pskb [S2IO]: Fixed memory leak when MSI-X vector allocation fails [BONDING]: Fix resource use after free [SYSCTL]: Fix warning for token-ring from sysctl checker [NET] random : secure_tcp_sequence_number should not assume CONFIG_KTIME_SCALAR [IWLWIFI]: Not correctly dealing with hotunplug. [TCP] FRTO: Plug potential LOST-bit leak [TCP] FRTO: Limit snd_cwnd if TCP was application limited [E1000]: Fix schedule while atomic when called from mii-tool. [NETX]: Fix build failure added by 2.6.24 statistics cleanup. [EP93xx_ETH]: Build fix after 2.6.24 NAPI changes. [PKT_SCHED]: Check subqueue status before calling hard_start_xmit
| * [SYSCTL]: Fix warning for token-ring from sysctl checkerOlof Johansson2007-11-14
| | | | | | | | | | | | | | | | | | As seen when booting ppc64_defconfig: sysctl table check failed: /net/token-ring .3.14 procname does not match binary path procname Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* | kernel/taskstats.c: fix bogus nlmsg_free()Adrian Bunk2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | We'd better not nlmsg_free on a pointer containing an undefined value (and without having anything allocated). Spotted by the Coverity checker. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: Balbir Singh <balbir@linux.vnet.ibm> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | hibernate: fix lockdep reportJohannes Berg2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Lockdep reports a circular locking dependency in the hibernate code because - during system boot hibernate code (from an initcall) locks pm_mutex and then a sysfs buffer mutex via name_to_dev_t - during regular operation hibernate code locks pm_mutex under a sysfs buffer mutex because it's called from sysfs methods. The deadlock can never happen because during initcall invocation nothing can write to sysfs yet. This removes the lockdep report by marking the initcall locking as being in a different class. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Alan Stern <stern@rowland.harvard.edu> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | __do_IRQ does not check IRQ_DISABLED when IRQ_PER_CPU is setRuss Anderson2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In __do_IRQ(), the normal case is that IRQ_DISABLED is checked and if set the handler (handle_IRQ_event()) is not called. Earlier in __do_IRQ(), if IRQ_PER_CPU is set the code does not check IRQ_DISABLED and calls the handler even though IRQ_DISABLED is set. This behavior seems unintentional. One user encountering this behavior is the CPE handler (in arch/ia64/kernel/mca.c). When the CPE handler encounters too many CPEs (such as a solid single bit error), it sets up a polling timer and disables the CPE interrupt (to avoid excessive overhead logging the stream of single bit errors). disable_irq_nosync() is called which sets IRQ_DISABLED. The IRQ_PER_CPU flag was previously set (in ia64_mca_late_init()). The net result is the CPE handler gets called even though it is marked disabled. If the behavior of not checking IRQ_DISABLED when IRQ_PER_CPU is set is intentional, it would be worthy of a comment describing the intended behavior. disable_irq_nosync() does call chip->disable() to provide a chipset specifiec interface for disabling the interrupt, which avoids this issue when used. Signed-off-by: Russ Anderson <rja@sgi.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | pidns: Place under CONFIG_EXPERIMENTALEric W. Biederman2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is my trivial patch to swat innumerable little bugs with a single blow. After some intensive review (my apologies for not having gotten to this sooner) what we have looks like a good base to build on with the current pid namespace code but it is not complete, and it is still much to simple to find issues where the kernel does the wrong thing outside of the initial pid namespace. Until the dust settles and we are certain we have the ABI and the implementation is as correct as humanly possible let's keep process ID namespaces behind CONFIG_EXPERIMENTAL. Allowing us the option of fixing any ABI or other bugs we find as long as they are minor. Allowing users of the kernel to avoid those bugs simply by ensuring their kernel does not have support for multiple pid namespaces. [akpm@linux-foundation.org: coding-style cleanups] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: Adrian Bunk <bunk@kernel.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Kir Kolyshkin <kir@swsoft.com> Cc: Kirill Korotaev <dev@sw.ru> Cc: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | fix param_sysfs_builtin name length checkJan Kiszka2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit faf8c714f4508207a9c81cc94dafc76ed6680b44 caused a regression: parameter names longer than MAX_KBUILD_MODNAME will now be rejected, although we just need to keep the module name part that short. This patch restores the old behaviour while still avoiding that memchr is called with its length parameter larger than the total string length. Signed-off-by: Jan Kiszka <jan.kiszka@web.de> Cc: Dave Young <hidave.darkstar@gmail.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Linux Kernel Markers: fix marker mutex not taken upon module loadMathieu Desnoyers2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upon module load, we must take the markers mutex. It implies that the marker mutex must be nested inside the module mutex. It implies changing the nesting order : now the marker mutex nests inside the module mutex. Make the necessary changes to reverse the order in which the mutexes are taken. Includes some cleanup from Dave Hansen <haveblue@us.ibm.com>. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | revert "Task Control Groups: example CPU accounting subsystem"Andrew Morton2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Revert 62d0df64065e7c135d0002f069444fbdfc64768f. This was originally intended as a simple initial example of how to create a control groups subsystem; it wasn't intended for mainline, but I didn't make this clear enough to Andrew. The CFS cgroup subsystem now has better functionality for the per-cgroup usage accounting (based directly on CFS stats) than the "usage" status file in this patch, and the "load" status file is rather simplistic - although having a per-cgroup load average report would be a useful feature, I don't believe this patch actually provides it. If it gets into the final 2.6.24 we'd probably have to support this interface for ever. Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Add IORESOUCE_BUSY flag for System RAMYasunori Goto2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | i386 and x86-64 registers System RAM as IORESOURCE_MEM | IORESOURCE_BUSY. But ia64 registers it as IORESOURCE_MEM only. In addition, memory hotplug code registers new memory as IORESOURCE_MEM too. This difference causes a failure of memory unplug of x86-64. This patch fixes it. This patch adds IORESOURCE_BUSY to avoid potential overlap mapping by PCI device. Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Cc: Luck, Tony" <tony.luck@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Improve cgroup printksDiego Calleja2007-11-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When I boot with the 'quiet' parameter, I see on the screen: [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 39.036026] Initializing cgroup subsys cpuacct [ 39.036080] Initializing cgroup subsys debug [ 39.036118] Initializing cgroup subsys ns This patch lowers the priority of those messages, adds a "cgroup: " prefix to another couple of printks and kills the useless reference to the source file. Signed-off-by: Diego Calleja <diegocg@gmail.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | sysctl: check length at deprecated_sysctl_warningTetsuo Handa2007-11-14
|/ | | | | | | | | Original patch assumed args->nlen < CTL_MAXNAME, but it can be false. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sigwait eats blocked default-ignore signalsRoland McGrath2007-11-12
| | | | | | | | | | | | | | | | | While a signal is blocked, it must be posted even if its action is SIG_IGN or is SIG_DFL with the default action to ignore. This works right most of the time, but is broken when a sigwait (rt_sigtimedwait) is in progress. This changes the early-discard check to respect real_blocked. ~blocked is the set to check for "should wake up now", but ~(blocked|real_blocked) is the set for "blocked" semantics as defined by POSIX. This fixes bugzilla entry 9347, see http://bugzilla.kernel.org/show_bug.cgi?id=9347 Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [FUTEX] Fix address computation in compat code.David Miller2007-11-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | compat_exit_robust_list() computes a pointer to the futex entry in userspace as follows: (void __user *)entry + futex_offset 'entry' is a 'struct robust_list __user *', and 'futex_offset' is a 'compat_long_t' (typically a 's32'). Things explode if the 32-bit sign bit is set in futex_offset. Type promotion sign extends futex_offset to a 64-bit value before adding it to 'entry'. This triggered a problem on sparc64 running 32-bit applications which would lock up a cpu looping forever in the fault handling for the userspace load in handle_futex_death(). Compat userspace runs with address masking (wherein the cpu zeros out the top 32-bits of every effective address given to a memory operation instruction) so the sparc64 fault handler accounts for this by zero'ing out the top 32-bits of the fault address too. Since the kernel properly uses the compat_uptr interfaces, kernel side accesses to compat userspace work too since they will only use addresses with the top 32-bit clear. Because of this compat futex layer bug we get into the following loop when executing the get_user() load near the top of handle_futex_death(): 1) load from address '0xfffffffff7f16bd8', FAULT 2) fault handler clears upper 32-bits, processes fault for address '0xf7f16bd8' which succeeds 3) goto #1 I want to thank Bernd Zeimetz, Josip Rodin, and Fabio Massimo Di Nitto for their tireless efforts helping me track down this bug. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* sched: proper prototype for kernel/sched.c:migration_init()Adrian Bunk2007-11-09
| | | | | | | | | | | | This patch adds a proper prototype for migration_init() in include/linux/sched.h Since there's no point in always returning 0 to a caller that doesn't check the return value it also changes the function to return void. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: avoid large irq-latencies in smp-balancingPeter Zijlstra2007-11-09
| | | | | | | | | | | | | SMP balancing is done with IRQs disabled and can iterate the full rq. When rqs are large this can cause large irq-latencies. Limit the nr of iterations on each run. This fixes a scheduling latency regression reported by the -rt folks. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Steven Rostedt <rostedt@goodmis.org> Tested-by: Gregory Haskins <ghaskins@novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: fix copy_namespace() <-> sched_fork() dependency in do_forkSrivatsa Vaddagiri2007-11-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Sukadev Bhattiprolu reported a kernel crash with control groups. There are couple of problems discovered by Suka's test: - The test requires the cgroup filesystem to be mounted with atleast the cpu and ns options (i.e both namespace and cpu controllers are active in the same hierarchy). # mkdir /dev/cpuctl # mount -t cgroup -ocpu,ns none cpuctl (or simply) # mount -t cgroup none cpuctl -> Will activate all controllers in same hierarchy. - The test invokes clone() with CLONE_NEWNS set. This causes a a new child to be created, also a new group (do_fork->copy_namespaces->ns_cgroup_clone-> cgroup_clone) and the child is attached to the new group (cgroup_clone-> attach_task->sched_move_task). At this point in time, the child's scheduler related fields are uninitialized (including its on_rq field, which it has inherited from parent). As a result sched_move_task thinks its on runqueue, when it isn't. As a solution to this problem, I moved sched_fork() call, which initializes scheduler related fields on a new task, before copy_namespaces(). I am not sure though whether moving up will cause other side-effects. Do you see any issue? - The second problem exposed by this test is that task_new_fair() assumes that parent and child will be part of the same group (which needn't be as this test shows). As a result, cfs_rq->curr can be NULL for the child. The solution is to test for curr pointer being NULL in task_new_fair(). With the patch below, I could run ns_exec() fine w/o a crash. Reported-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up the wakeup preempt check, #2Ingo Molnar2007-11-09
| | | | | | | | | | | clean up the preemption check to not use unnecessary 64-bit variables. This improves code size: text data bss dec hex filename 44227 3326 36 47589 b9e5 sched.o.before 44201 3326 36 47563 b9cb sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: clean up the wakeup preempt checkIngo Molnar2007-11-09
| | | | | | | | | | clean up the wakeup preemption check. No code changed: text data bss dec hex filename 44227 3326 36 47589 b9e5 sched.o.before 44227 3326 36 47589 b9e5 sched.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: wakeup preemption fixIngo Molnar2007-11-09
| | | | | | | | | wakeup preemption fix: do not make it dependent on p->prio. Preemption purely depends on ->vruntime. This improves preemption in mixed-nice-level workloads. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: remove PREEMPT_RESTRICTIngo Molnar2007-11-09
| | | | | | | remove PREEMPT_RESTRICT. (this is a separate commit so that any regression related to the removal itself is bisectable) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: turn off PREEMPT_RESTRICTIngo Molnar2007-11-09
| | | | | | | | | | | | | PREEMPT_RESTRICT was a method aimed at reducing the amount of wakeup related preemption. It has a disadvantage though, it can prevent legitimate wakeups if a task is 'unlucky' to be hit too early by a tick that clears peer_preempt. Now that the wakeup preemption has been cleaned up we dont seem to have excessive preemptions anymore, so this feature can be turned off. (and removed in the next patch) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: cleanup, use NSEC_PER_MSEC and NSEC_PER_SECEric Dumazet2007-11-09
| | | | | | | | | | | | | | | | | 1) hardcoded 1000000000 value is used five times in places where NSEC_PER_SEC might be more readable. 2) A conversion from nsec to msec uses the hardcoded 1000000 value, which is a candidate for NSEC_PER_MSEC. no code changed: text data bss dec hex filename 44359 3326 36 47721 ba69 sched.o.before 44359 3326 36 47721 ba69 sched.o.after Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: reintroduce SMP tunings againIngo Molnar2007-11-09
| | | | | | | | | | | | | | | | | | | Yanmin Zhang reported an aim7 regression and bisected it down to: | commit 38ad464d410dadceda1563f36bdb0be7fe4c8938 | Author: Ingo Molnar <mingo@elte.hu> | Date: Mon Oct 15 17:00:02 2007 +0200 | | sched: uniform tunings | | use the same defaults on both UP and SMP. fix this by reintroducing similar SMP tunings again. This resolves the regression. (also update the comments to match the ilog2(nr_cpus) tuning effect) Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: restore deterministic CPU accounting on powerpcPaul Mackerras2007-11-09
| | | | | | | | | | | | | | | | | | | | | | | | | | Since powerpc started using CONFIG_GENERIC_CLOCKEVENTS, the deterministic CPU accounting (CONFIG_VIRT_CPU_ACCOUNTING) has been broken on powerpc, because we end up counting user time twice: once in timer_interrupt() and once in update_process_times(). This fixes the problem by pulling the code in update_process_times that updates utime and stime into a separate function called account_process_tick. If CONFIG_VIRT_CPU_ACCOUNTING is not defined, there is a version of account_process_tick in kernel/timer.c that simply accounts a whole tick to either utime or stime as before. If CONFIG_VIRT_CPU_ACCOUNTING is defined, then arch code gets to implement account_process_tick. This also lets us simplify the s390 code a bit; it means that the s390 timer interrupt can now call update_process_times even when CONFIG_VIRT_CPU_ACCOUNTING is turned on, and can just implement a suitable account_process_tick(). account_process_tick() now takes the task_struct * as an argument. Tested both with and without CONFIG_VIRT_CPU_ACCOUNTING. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: fix delay accounting regressionBalbir Singh2007-11-09
| | | | | | | | | | | | | Fix the delay accounting regression introduced by commit 75d4ef16a6aa84f708188bada182315f80aab6fa. rq no longer has sched_info data associated with it. task_struct sched_info structure is used by delay accounting to provide back statistics to user space. also remove direct use of sched_clock() (which is not a valid thing to do anymore) and use rq->clock instead. Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: reintroduce the sched_min_granularity tunablePeter Zijlstra2007-11-09
| | | | | | | | | | | | | | | we lost the sched_min_granularity tunable to a clever optimization that uses the sched_latency/min_granularity ratio - but the ratio is quite unintuitive to users and can also crash the kernel if the ratio is set to 0. So reintroduce the min_granularity tunable, while keeping the ratio maintained internally. no functionality changed. [ mingo@elte.hu: some fixlets. ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: documentation: place_entity() commentsPeter Zijlstra2007-11-09
| | | | | | | Add a few comments to place_entity(). No code changed. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* sched: fix vslicePeter Zijlstra2007-11-09
| | | | | | | | | | | vslice was missing a factor NICE_0_LOAD, as weight is in weight*NICE_0_LOAD units. the effect of this bug was larger initial slices and thus latency-noisier forks. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* time: fix inconsistent function names in commentsLi Zefan2007-11-05
| | | | | | | | Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Dump stack during sysctl registration failureAlexey Dobriyan2007-11-05
| | | | | | | | | | Let's make immediately obvious from where sysctl comes from and messages itself more noticeable. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* kernel/futex.c: make 3 functions staticAdrian Bunk2007-11-05
| | | | | | | | | | The following functions can now become static again: - get_futex_key() - get_futex_key_refs() - drop_futex_key_refs() Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Merge branch 'v2.6.24-rc1-lockdep' of ↵Linus Torvalds2007-11-03
|\ | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-lockdep * 'v2.6.24-rc1-lockdep' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-lockdep: lockdep: fix a typo in the __lock_acquire comment sched: fix unconditional irq lock lockdep: fixup irq tracing
| * lockdep: fix a typo in the __lock_acquire commentGautham R Shenoy2007-10-28
| | | | | | | | | | | | | | | | Fix a typo in the __lock_acquire comment. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * sched: fix unconditional irq lockPeter Zijlstra2007-10-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Lockdep noticed that this lock can also be taken from hardirq context, and can thus not unconditionally disable/enable irqs. WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on() [show_trace_log_lvl+26/48] show_trace_log_lvl+0x1a/0x30 [show_trace+18/32] show_trace+0x12/0x20 [dump_stack+22/32] dump_stack+0x16/0x20 [trace_hardirqs_on+405/416] trace_hardirqs_on+0x195/0x1a0 [_read_unlock_irq+34/48] _read_unlock_irq+0x22/0x30 [sched_debug_show+2615/4224] sched_debug_show+0xa37/0x1080 [show_state_filter+326/368] show_state_filter+0x146/0x170 [sysrq_handle_showstate+10/16] sysrq_handle_showstate+0xa/0x10 [__handle_sysrq+123/288] __handle_sysrq+0x7b/0x120 [handle_sysrq+40/64] handle_sysrq+0x28/0x40 [kbd_event+1045/1680] kbd_event+0x415/0x690 [input_pass_event+206/208] input_pass_event+0xce/0xd0 [input_handle_event+170/928] input_handle_event+0xaa/0x3a0 [input_event+95/112] input_event+0x5f/0x70 [atkbd_interrupt+434/1456] atkbd_interrupt+0x1b2/0x5b0 [serio_interrupt+59/128] serio_interrupt+0x3b/0x80 [i8042_interrupt+263/576] i8042_interrupt+0x107/0x240 [handle_IRQ_event+40/96] handle_IRQ_event+0x28/0x60 [handle_edge_irq+175/320] handle_edge_irq+0xaf/0x140 [do_IRQ+64/128] do_IRQ+0x40/0x80 [common_interrupt+46/52] common_interrupt+0x2e/0x34 Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | [COMPAT]: Fix build on COMPAT platforms when CONFIG_NET is disabled.David S. Miller2007-10-31
| | | | | | | | | | | | Add some missing cond_syscall() entries for this case. Signed-off-by: David S. Miller <davem@davemloft.net>
* | Freezer: do not allow freezing processes to clear TIF_SIGPENDINGRafael J. Wysocki2007-10-30
| | | | | | | | | | | | | | | | | | | | | | | | Do not allow processes to clear their TIF_SIGPENDING if TIF_FREEZE is set, so that they will not race with the freezer (like mysqld does, for example). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Nigel Cunningham <nigel@suspend2.net> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | sched: fix /proc/<PID>/stat stime/utime monotonicity, part 2Balbir Singh2007-10-29
| | | | | | | | | | | | | | | | | | Extend Peter's patch to fix accounting issues, by keeping stime monotonic too. Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Tested-by: Frans Pop <elendil@planet.nl>
* | sched: fix style in kernel/sched.cIngo Molnar2007-10-29
| | | | | | | | | | | | fallout of recent commits: small coding style fixes. Signed-off-by: Ingo Molnar <mingo@elte.hu>
* | sched: fix style of swap() macro in kernel/sched_fair.cIngo Molnar2007-10-29
| | | | | | | | | | | | | | | | | | fix style of swap() macro in kernel/sched_fair.c. ( this macro should eventually move to a general header, as ext3 uses a similar construct too. ) Signed-off-by: Ingo Molnar <mingo@elte.hu>
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