Peter Zijlstra
5d18023294
sched: Fix load avg vs cpu-hotplug ...
Rabik and Paul reported two different issues related to the same few
lines of code.
Rabik's issue is that the nr_uninterruptible migration code is wrong in
that he sees artifacts due to this (Rabik please do expand in more
detail).
Paul's issue is that this code as it stands relies on us using
stop_machine() for unplug, we all would like to remove this assumption
so that eventually we can remove this stop_machine() usage altogether.
The only reason we'd have to migrate nr_uninterruptible is so that we
could use for_each_online_cpu() loops in favour of
for_each_possible_cpu() loops, however since nr_uninterruptible() is the
only such loop and its using possible lets not bother at all.
The problem Rabik sees is (probably) caused by the fact that by
migrating nr_uninterruptible we screw rq->calc_load_active for both rqs
involved.
So don't bother with fancy migration schemes (meaning we now have to
keep using for_each_possible_cpu()) and instead fold any nr_active delta
after we migrate all tasks away to make sure we don't have any skewed
nr_active accounting.
[ paulmck: Move call to calc_load_migration to CPU_DEAD to avoid
miscounting noted by Rakib. ]
Reported-by: Rakib Mullick <rakib.mullick@gmail.com>
Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
2012-09-23 07:43:56 -07:00
kernel/debug: Make use of KGDB_REASON_NMI
2012-07-31 08:16:43 -05:00
perf/trace: Add ability to set a target task for events
2012-07-31 17:02:05 +02:00
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2012-08-03 10:56:44 -07:00
Revert "NMI watchdog: fix for lockup detector breakage on resume"
2012-08-08 20:49:45 +02:00
sched: Fix load avg vs cpu-hotplug
2012-09-23 07:43:56 -07:00
time: Move ktime_t overflow checking into timespec_valid_strict
2012-09-01 10:24:48 -07:00
tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1
2012-08-17 15:19:46 -04:00
Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-01-08 12:19:57 -08:00
[SCSI] async: make async_synchronize_full() flush all work regardless of domain
2012-07-20 09:07:37 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-08-01 10:26:23 -07:00
audit: remove AUDIT_SETUP_CONTEXT as it isn't used
2012-01-17 16:16:57 -05:00
audit: clean up refcounting in audit-tree
2012-08-15 12:55:22 +02:00
get rid of kern_path_parent()
2012-07-14 16:35:02 +04:00
audit: allow interfield comparison in audit rules
2012-01-17 16:17:01 -05:00
seccomp: remove duplicated failure logging
2012-04-14 11:13:20 +10:00
userns: Teach inode_capable to understand inodes whose uids map to other namespaces.
2012-05-15 14:59:24 -07:00
Merge branch 'for-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2012-07-24 17:47:44 -07:00
cgroup: convert all non-memcg controllers to the new cftype interface
2012-04-01 12:09:55 -07:00
new helper: sigsuspend()
2012-05-21 23:52:30 -04:00
mm/hotplug: correctly setup fallback zonelists when creating new pgdat
2012-07-31 18:42:44 -07:00
kernel/cpu_pm.c: fix various typos
2012-05-31 17:49:27 -07:00
cpusets: Remove/update outdated comments
2012-07-24 13:53:28 +02:00
keys: kill task_struct->replacement_session_keyring
2012-05-23 22:11:41 -04:00
Remove all #inclusions of asm/system.h
2012-03-28 18:30:03 +01:00
posix_types.h: Cleanup stale __NFDBITS and related definitions
2012-07-26 13:36:43 -07:00
extable: Skip sorting if sorted at build time.
2012-04-19 15:06:55 -07:00
uprobes: Fix mmap_region()'s mm->mm_rb corruption if uprobe_mmap() fails
2012-08-21 11:48:12 +02:00
PM / Freezer: Remove references to TIF_FREEZE in comments
2012-03-04 23:08:54 +01:00
futex: Forbid uaddr == uaddr2 in futex_wait_requeue_pi()
2012-07-24 16:02:57 +02:00
futex: Mark get_robust_list as deprecated
2012-03-29 11:37:17 +02:00
userns: Convert in_group_p and in_egroup_p to use kgid_t
2012-05-03 03:29:33 -07:00
hrtimer: Update hrtimer base offsets each hrtimer_interrupt
2012-07-11 23:34:39 +02:00
hung task debugging: Inject NMI when hung and going to panic
2012-04-25 12:39:25 +02:00
irq_work: fix compile failure on tile from missing include
2012-04-13 13:15:16 -04:00
itimer: Use printk_once instead of WARN_ONCE
2012-04-10 11:00:30 +02:00
static keys: Inline the static_key_enabled() function
2012-02-28 20:01:08 +01:00
vsprintf: fix %ps on non symbols when using kallsyms
2012-05-29 16:22:32 -07:00
syscalls, x86: add __NR_kcmp syscall
2012-05-31 17:49:32 -07:00
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
kdump: append newline to the last lien of vmcoreinfo note
2012-07-30 17:25:20 -07:00
[media] kernel:kfifo: export __kfifo_max_r symbol
2012-04-11 18:24:37 -03:00
kmod: avoid deadlock from recursive kmod call
2012-07-30 17:25:20 -07:00
kprobes: return proper error code from register_kprobe()
2012-03-05 15:49:42 -08:00
kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed
2012-07-22 10:15:28 -07:00
brlocks/lglocks: turn into functions
2012-05-29 23:28:41 -04:00
lockdep: Add CPU-idle/offline warning to lockdep-RCU splat
2012-02-21 09:06:06 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-06-01 10:34:35 -07:00
Guard check in module loader against integer overflow
2012-05-23 22:28:53 +09:30
sched/rt: Use schedule_preempt_disabled()
2012-03-01 10:28:03 +01:00
padata: Fix cpu hotplug
2012-03-29 19:52:46 +08:00
panic: fix a possible deadlock in panic()
2012-07-30 17:25:13 -07:00
params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)
2012-05-04 17:28:18 -07:00
mm: add a low limit to alloc_large_system_hash
2012-05-24 00:28:21 -04:00
pidns: guarantee that the pidns init will be the last pidns process reaped
2012-06-20 14:39:36 -07:00
printk: Fix calculation of length used to discard records
2012-08-12 21:25:50 +03:00
userns: Convert ptrace, kill, set_priority permission checks to work with kuids and kgids
2012-05-03 03:28:51 -07:00
rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit()
2012-02-21 09:06:12 -08:00
rcu: Consolidate tree/tiny __rcu_read_{,un}lock() implementations
2012-07-02 12:34:23 -07:00
rcu: Fix rcu_is_cpu_idle() #ifdef in TINY_RCU
2012-07-02 12:34:25 -07:00
rcu: Fix code-style issues involving "else"
2012-07-06 06:01:48 -07:00
rcu: Fix broken strings in RCU's source code.
2012-07-06 06:01:49 -07:00
rcu: Disallow callback registry on offline CPUs
2012-09-23 07:43:55 -07:00
rcu: Remove _rcu_barrier() dependency on __stop_machine()
2012-09-23 07:43:55 -07:00
rcu: Fix code-style issues involving "else"
2012-07-06 06:01:48 -07:00
rcu: Remove _rcu_barrier() dependency on __stop_machine()
2012-09-23 07:43:55 -07:00
splice: fix racy pipe->buffers uses
2012-06-13 21:16:42 +02:00
rescounters: add res_counter_uncharge_until()
2012-05-29 16:22:27 -07:00
resource: make sure requested range is included in the root range
2012-07-30 17:25:21 -07:00
Remove all #inclusions of asm/system.h
2012-03-28 18:30:03 +01:00
seccomp: fix build warnings when there is no CONFIG_SECCOMP_FILTER
2012-04-18 12:24:52 +10:00
semaphore: fix improper comment reference to mutex
2012-04-05 17:15:55 -07:00
signal: make sure we don't get stopped with pending task_work
2012-07-22 23:57:54 +04:00
smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]()
2012-06-05 17:27:14 +02:00
smpboot, idle: Fix comment mismatch over idle_threads_init()
2012-05-24 22:58:08 +02:00
smpboot: Remove leftover declaration
2012-06-11 15:07:52 +02:00
mm: allow PF_MEMALLOC from softirq context
2012-07-31 18:42:45 -07:00
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
rcu: Implement per-domain single-threaded call_srcu() state machine
2012-04-30 10:48:25 -07:00
kernel/sys.c: avoid argv_free(NULL)
2012-07-30 17:25:13 -07:00
syscalls, x86: add __NR_kcmp syscall
2012-05-31 17:49:32 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-08-01 10:26:23 -07:00
mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads
2012-07-31 18:42:40 -07:00
task_work: add a scheduling point in task_work_run()
2012-08-21 09:11:44 -07:00
taskstats: check nla_reserve() return
2012-07-30 17:25:21 -07:00
time: Remove bogus comments
2012-03-15 18:17:55 -07:00
alpha: take a bunch of syscalls into osf_sys.c
2012-08-19 08:41:19 -07:00
static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]()
2012-02-24 10:05:59 +01:00
userns: Convert setting and getting uid and gid system calls to use kuid and kgid
2012-05-03 03:28:41 -07:00
userns: Silence silly gcc warning.
2012-05-19 15:44:40 -06:00
userns: Store uid and gid values in struct cred with kuid_t and kgid_t types
2012-05-03 03:28:38 -07:00
userns: Use cred->user_ns instead of cred->user->user_ns
2012-04-07 16:55:51 -07:00
Revert "NMI watchdog: fix for lockup detector breakage on resume"
2012-08-08 20:49:45 +02:00
workqueue: fix spurious CPU locality WARN from process_one_work()
2012-07-22 10:16:34 -07:00
5d18023294