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  1. 12 8月, 2008 23 次提交
  3. 11 8月, 2008 17 次提交
    • D
      sched, cpu hotplug: fix set_cpus_allowed() use in hotplug callbacks · 279ef6bb
      由 Dmitry Adamushko 提交于 
      Mark Langsdorf reported:

> One of my co-workers noticed that the powernow-k8
> driver no longer restarts when a CPU core is
> hot-disabled and then hot-enabled on AMD quad-core
> systems.
>
> The following comands work fine on 2.6.26 and fail
> on 2.6.27-rc1:
>
> echo 0 > /sys/devices/system/cpu/cpu3/online
> echo 1 > /sys/devices/system/cpu/cpu3/online
> find /sys -name cpufreq
>
> For 2.6.26, the find will return a cpufreq
> directory for each processor.  In 2.6.27-rc1,
> the cpu3 directory is missing.
>
> After digging through the code, the following
> logic is failing when the core is hot-enabled
> at runtime.  The code works during the boot
> sequence.
>
>       cpumask_t = current->cpus_allowed;
>       set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
>       if (smp_processor_id() != cpu)
>               return -ENODEV;

So set the CPU active before calling the CPU_ONLINE notifier chain,
there are a handful of notifiers that use set_cpus_allowed().

This fix also solves the problem with x86-microcode. I've sent
alternative patches for microcode, but as this "rely on
set_cpus_allowed_ptr() being workable in cpu-hotplug(CPU_ONLINE, ...)"
assumption seems to be more broad than what we thought, perhaps this fix
should be applied.

With this patch we define that by the moment CPU_ONLINE is being sent,
a 'cpu' is online and ready for tasks to be migrated onto it.
Signed-off-by: NDmitry Adamushko <dmitry.adamushko@gmail.com>
Reported-by: NMark Langsdorf <mark.langsdorf@amd.com>
Tested-by: NMark Langsdorf <mark.langsdorf@amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      279ef6bb
    • I
      lockdep: increase MAX_LOCKDEP_KEYS · e5f363e3
      由 Ingo Molnar 提交于 
      certain configs produce:

 [   70.076229] BUG: MAX_LOCKDEP_KEYS too low!
 [   70.080230] turning off the locking correctness validator.

tune them up.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      e5f363e3
    • N
      generic-ipi: fix stack and rcu interaction bug in smp_call_function_mask() · cc7a486c
      由 Nick Piggin 提交于 
      * Venki Pallipadi <venkatesh.pallipadi@intel.com> wrote:

> Found a OOPS on a big SMP box during an overnight reboot test with
> upstream git.
>
> Suresh and I looked at the oops and looks like the root cause is in
> generic_smp_call_function_interrupt() and smp_call_function_mask() with
> wait parameter.
>
> The actual oops looked like
>
> [   11.277260] BUG: unable to handle kernel paging request at ffff8802ffffffff
> [   11.277815] IP: [<ffff8802ffffffff>] 0xffff8802ffffffff
> [   11.278155] PGD 202063 PUD 0
> [   11.278576] Oops: 0010 [1] SMP
> [   11.279006] CPU 5
> [   11.279336] Modules linked in:
> [   11.279752] Pid: 0, comm: swapper Not tainted 2.6.27-rc2-00020-g685d87f7 #290
> [   11.280039] RIP: 0010:[<ffff8802ffffffff>]  [<ffff8802ffffffff>] 0xffff8802ffffffff
> [   11.280692] RSP: 0018:ffff88027f1f7f70  EFLAGS: 00010086
> [   11.280976] RAX: 00000000ffffffff RBX: 0000000000000000 RCX: 0000000000000000
> [   11.281264] RDX: 0000000000004f4e RSI: 0000000000000001 RDI: 0000000000000000
> [   11.281624] RBP: ffff88027f1f7f98 R08: 0000000000000001 R09: ffffffff802509af
> [   11.281925] R10: ffff8800280c2780 R11: 0000000000000000 R12: ffff88027f097d48
> [   11.282214] R13: ffff88027f097d70 R14: 0000000000000005 R15: ffff88027e571000
> [   11.282502] FS:  0000000000000000(0000) GS:ffff88027f1c3340(0000) knlGS:0000000000000000
> [   11.283096] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> [   11.283382] CR2: ffff8802ffffffff CR3: 0000000000201000 CR4: 00000000000006e0
> [   11.283760] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [   11.284048] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [   11.284337] Process swapper (pid: 0, threadinfo ffff88027f1f2000, task ffff88027f1f0640)
> [   11.284936] Stack:  ffffffff80250963 0000000000000212 0000000000ee8c78 0000000000ee8a66
> [   11.285802]  ffff88027e571550 ffff88027f1f7fa8 ffffffff8021adb5 ffff88027f1f3e40
> [   11.286599]  ffffffff8020bdd6 ffff88027f1f3e40 <EOI>  ffff88027f1f3ef8 0000000000000000
> [   11.287120] Call Trace:
> [   11.287768]  <IRQ>  [<ffffffff80250963>] ? generic_smp_call_function_interrupt+0x61/0x12c
> [   11.288354]  [<ffffffff8021adb5>] smp_call_function_interrupt+0x17/0x27
> [   11.288744]  [<ffffffff8020bdd6>] call_function_interrupt+0x66/0x70
> [   11.289030]  <EOI>  [<ffffffff8024ab3b>] ? clockevents_notify+0x19/0x73
> [   11.289380]  [<ffffffff803b9b75>] ? acpi_idle_enter_simple+0x18b/0x1fa
> [   11.289760]  [<ffffffff803b9b6b>] ? acpi_idle_enter_simple+0x181/0x1fa
> [   11.290051]  [<ffffffff8053aeca>] ? cpuidle_idle_call+0x70/0xa2
> [   11.290338]  [<ffffffff80209f61>] ? cpu_idle+0x5f/0x7d
> [   11.290723]  [<ffffffff8060224a>] ? start_secondary+0x14d/0x152
> [   11.291010]
> [   11.291287]
> [   11.291654] Code:  Bad RIP value.
> [   11.292041] RIP  [<ffff8802ffffffff>] 0xffff8802ffffffff
> [   11.292380]  RSP <ffff88027f1f7f70>
> [   11.292741] CR2: ffff8802ffffffff
> [   11.310951] ---[ end trace 137c54d525305f1c ]---
>
> The problem is with the following sequence of events:
>
> - CPU A calls smp_call_function_mask() for CPU B with wait parameter
> - CPU A sets up the call_function_data on the stack and does an rcu add to
>   call_function_queue
> - CPU A waits until the WAIT flag is cleared
> - CPU B gets the call function interrupt and starts going through the
>   call_function_queue
> - CPU C also gets some other call function interrupt and starts going through
>   the call_function_queue
> - CPU C, which is also going through the call_function_queue, starts referencing
>   CPU A's stack, as that element is still in call_function_queue
> - CPU B finishes the function call that CPU A set up and as there are no other
>   references to it, rcu deletes the call_function_data (which was from CPU A
>   stack)
> - CPU B sees the wait flag and just clears the flag (no call_rcu to free)
> - CPU A which was waiting on the flag continues executing and the stack
>   contents change
>
> - CPU C is still in rcu_read section accessing the CPU A's stack sees
>   inconsistent call_funation_data and can try to execute
>   function with some random pointer, causing stack corruption for A
>   (by clearing the bits in mask field) and oops.

Nice debugging work.

I'd suggest something like the attached (boot tested) patch as the simple
fix for now.

I expect the benefits from the less synchronized, multiple-in-flight-data
global queue will still outweigh the costs of dynamic allocations. But
if worst comes to worst then we just go back to a globally synchronous
one-at-a-time implementation, but that would be pretty sad!
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      cc7a486c
    • M
      sched: fix mysql+oltp regression · 77ae6513
      由 Mike Galbraith 提交于 
      Defer commit 6d299f1b to the next release.

Testing of the tip/sched/clock tree revealed a mysql+oltp regression
which bisection eventually traced back to this commit in mainline.

Pertinent test results:  Three run sysbench averages, throughput units
in read/write requests/sec.

clients         1     2     4     8    16    32    64
6e0534f2      9646 17876 34774 33868 32230 30767 29441
2.6.26.1     9112 17936 34652 33383 31929 30665 29232
6d299f1b      9112 14637 28370 33339 32038 30762 29204

Note: subsequent commits hide the majority of this regression until you
apply the clock fixes, at which time it reemerges at full magnitude.

We cannot see anything bad about the change itself so we defer it to the
next release until this problem is fully analysed.
Signed-off-by: NMike Galbraith <efault@gmx.de>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      77ae6513
    • I
      Merge branch 'linus' into sched/urgent · 251a169c
      由 Ingo Molnar 提交于
      251a169c
    • P
      powerpc: Remove include/linux/harrier_defs.h · 13fa00a8
      由 Paul Mackerras 提交于 
      It was only used by code in arch/ppc, and arch/ppc is gone, so remove
the unused harrier_defs.h as well.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
      13fa00a8
    • P
      lockdep: fix overflow in the hlock shrinkage code · b42e737e
      由 Peter Zijlstra 提交于 
      There is a overflow by 1 case in the new shrunken hlock code.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      b42e737e
    • E
      x86_64: restore the proper NR_IRQS define so larger systems work. · 3c7569b2
      由 Eric W. Biederman 提交于 
      As pointed out and tracked by Yinghai Lu <yhlu.kernel@gmail.com>:

 Dhaval Giani got:
 kernel BUG at arch/x86/kernel/io_apic_64.c:357!
 invalid opcode: 0000 [1] SMP
 CPU 24
 ...

his system (x3950) has 8 ioapic, irq > 256

This was caused by:

       commit 9b7dc567
       Author: Thomas Gleixner <tglx@linutronix.de>
       Date:   Fri May 2 20:10:09 2008 +0200

          x86: unify interrupt vector defines

          The interrupt vector defines are copied 4 times around with minimal
          differences. Move them all into asm-x86/irq_vectors.h

It appears that Thomas did not notice that x86_64 does something
completely different when he merge irq_vectors.h

We can solve this for 2.6.27 by simply reintroducing the old heuristic
for setting NR_IRQS on x86_64 to a usable value, which trivially removes
the regression.

Long term it would be nice to harmonize the handling of ioapic interrupts
of x86_32 and x86_64 so we don't have this kind of confusion.

Dhaval Giani <dhaval@linux.vnet.ibm.com> tested an earlier version of
this patch by YH which confirms simply increasing NR_IRQS fixes the
problem.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Acked-by: NYinghai Lu <yhlu.kernel@gmail.com>
Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: Mike Travis <travis@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3c7569b2
    • E
      x86: Restore proper vector locking during cpu hotplug · d388e5fd
      由 Eric W. Biederman 提交于 
      Having cpu_online_map change during assign_irq_vector can result
in some really nasty and weird things happening.  The one that
bit me last time was accessing non existent per cpu memory for non
existent cpus.

This locking was removed in a sloppy x86_64 and x86_32 merge patch.

Guys can we please try and avoid subtly breaking x86 when we are
merging files together?
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      d388e5fd
    • I
      lockdep: rename map_[acquire|release]() => lock_map_[acquire|release]() · 3295f0ef
      由 Ingo Molnar 提交于 
      the names were too generic:

 drivers/uio/uio.c:87: error: expected identifier or '(' before 'do'
 drivers/uio/uio.c:87: error: expected identifier or '(' before 'while'
 drivers/uio/uio.c:113: error: 'map_release' undeclared here (not in a function)
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3295f0ef
    • R
      lockdep: handle chains involving classes defined in modules · 8bfe0298
      由 Rabin Vincent 提交于 
      Solve this by marking the classes as unused and not printing information
about the unused classes.
Reported-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: NRabin Vincent <rabin@rab.in>
Acked-by: NHuang Ying <ying.huang@intel.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8bfe0298
    • P
      mm: fix mm_take_all_locks() locking order · 7cd5a02f
      由 Peter Zijlstra 提交于 
      Lockdep spotted:

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.27-rc1 #270
-------------------------------------------------------
qemu-kvm/2033 is trying to acquire lock:
 (&inode->i_data.i_mmap_lock){----}, at: [<ffffffff802996cc>] mm_take_all_locks+0xc2/0xea

but task is already holding lock:
 (&anon_vma->lock){----}, at: [<ffffffff8029967a>] mm_take_all_locks+0x70/0xea

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (&anon_vma->lock){----}:
       [<ffffffff8025cd37>] __lock_acquire+0x11be/0x14d2
       [<ffffffff8025d0a9>] lock_acquire+0x5e/0x7a
       [<ffffffff804c655b>] _spin_lock+0x3b/0x47
       [<ffffffff8029a2ef>] vma_adjust+0x200/0x444
       [<ffffffff8029a662>] split_vma+0x12f/0x146
       [<ffffffff8029bc60>] mprotect_fixup+0x13c/0x536
       [<ffffffff8029c203>] sys_mprotect+0x1a9/0x21e
       [<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b
       [<ffffffffffffffff>] 0xffffffffffffffff

-> #0 (&inode->i_data.i_mmap_lock){----}:
       [<ffffffff8025ca54>] __lock_acquire+0xedb/0x14d2
       [<ffffffff8025d397>] lock_release_non_nested+0x1c2/0x219
       [<ffffffff8025d515>] lock_release+0x127/0x14a
       [<ffffffff804c6403>] _spin_unlock+0x1e/0x50
       [<ffffffff802995d9>] mm_drop_all_locks+0x7f/0xb0
       [<ffffffff802a965d>] do_mmu_notifier_register+0xe2/0x112
       [<ffffffff802a96a8>] mmu_notifier_register+0xe/0x10
       [<ffffffffa0043b6b>] kvm_dev_ioctl+0x11e/0x287 [kvm]
       [<ffffffff802bd0ca>] vfs_ioctl+0x2a/0x78
       [<ffffffff802bd36f>] do_vfs_ioctl+0x257/0x274
       [<ffffffff802bd3e1>] sys_ioctl+0x55/0x78
       [<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b
       [<ffffffffffffffff>] 0xffffffffffffffff

other info that might help us debug this:

5 locks held by qemu-kvm/2033:
 #0:  (&mm->mmap_sem){----}, at: [<ffffffff802a95d0>] do_mmu_notifier_register+0x55/0x112
 #1:  (mm_all_locks_mutex){--..}, at: [<ffffffff8029963e>] mm_take_all_locks+0x34/0xea
 #2:  (&anon_vma->lock){----}, at: [<ffffffff8029967a>] mm_take_all_locks+0x70/0xea
 #3:  (&anon_vma->lock){----}, at: [<ffffffff8029967a>] mm_take_all_locks+0x70/0xea
 #4:  (&anon_vma->lock){----}, at: [<ffffffff8029967a>] mm_take_all_locks+0x70/0xea

stack backtrace:
Pid: 2033, comm: qemu-kvm Not tainted 2.6.27-rc1 #270

Call Trace:
 [<ffffffff8025b7c7>] print_circular_bug_tail+0xb8/0xc3
 [<ffffffff8025ca54>] __lock_acquire+0xedb/0x14d2
 [<ffffffff80259bb1>] ? add_lock_to_list+0x7e/0xad
 [<ffffffff8029967a>] ? mm_take_all_locks+0x70/0xea
 [<ffffffff8029967a>] ? mm_take_all_locks+0x70/0xea
 [<ffffffff8025d397>] lock_release_non_nested+0x1c2/0x219
 [<ffffffff802996cc>] ? mm_take_all_locks+0xc2/0xea
 [<ffffffff802996cc>] ? mm_take_all_locks+0xc2/0xea
 [<ffffffff8025b202>] ? trace_hardirqs_on_caller+0x4d/0x115
 [<ffffffff802995d9>] ? mm_drop_all_locks+0x7f/0xb0
 [<ffffffff8025d515>] lock_release+0x127/0x14a
 [<ffffffff804c6403>] _spin_unlock+0x1e/0x50
 [<ffffffff802995d9>] mm_drop_all_locks+0x7f/0xb0
 [<ffffffff802a965d>] do_mmu_notifier_register+0xe2/0x112
 [<ffffffff802a96a8>] mmu_notifier_register+0xe/0x10
 [<ffffffffa0043b6b>] kvm_dev_ioctl+0x11e/0x287 [kvm]
 [<ffffffff8033f9f2>] ? file_has_perm+0x83/0x8e
 [<ffffffff802bd0ca>] vfs_ioctl+0x2a/0x78
 [<ffffffff802bd36f>] do_vfs_ioctl+0x257/0x274
 [<ffffffff802bd3e1>] sys_ioctl+0x55/0x78
 [<ffffffff8020c0db>] system_call_fastpath+0x16/0x1b

Which the locking hierarchy in mm/rmap.c confirms as valid.

Fix this by first taking all the mapping->i_mmap_lock instances and then
take all anon_vma->lock instances.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      7cd5a02f
    • P
      lockdep: annotate mm_take_all_locks() · 454ed842
      由 Peter Zijlstra 提交于 
      The nesting is correct due to holding mmap_sem, use the new annotation
to annotate this.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      454ed842
    • P
      lockdep: spin_lock_nest_lock() · b7d39aff
      由 Peter Zijlstra 提交于 
      Expose the new lock protection lock.

This can be used to annotate places where we take multiple locks of the
same class and avoid deadlocks by always taking another (top-level) lock
first.

NOTE: we're still bound to the MAX_LOCK_DEPTH (48) limit.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      b7d39aff
    • P
      lockdep: lock protection locks · 7531e2f3
      由 Peter Zijlstra 提交于 
      On Fri, 2008-08-01 at 16:26 -0700, Linus Torvalds wrote:

> On Fri, 1 Aug 2008, David Miller wrote:
> >
> > Taking more than a few locks of the same class at once is bad
> > news and it's better to find an alternative method.
>
> It's not always wrong.
>
> If you can guarantee that anybody that takes more than one lock of a
> particular class will always take a single top-level lock _first_, then
> that's all good. You can obviously screw up and take the same lock _twice_
> (which will deadlock), but at least you cannot get into ABBA situations.
>
> So maybe the right thing to do is to just teach lockdep about "lock
> protection locks". That would have solved the multi-queue issues for
> networking too - all the actual network drivers would still have taken
> just their single queue lock, but the one case that needs to take all of
> them would have taken a separate top-level lock first.
>
> Never mind that the multi-queue locks were always taken in the same order:
> it's never wrong to just have some top-level serialization, and anybody
> who needs to take <n> locks might as well do <n+1>, because they sure as
> hell aren't going to be on _any_ fastpaths.
>
> So the simplest solution really sounds like just teaching lockdep about
> that one special case. It's not "nesting" exactly, although it's obviously
> related to it.

Do as Linus suggested. The lock protection lock is called nest_lock.

Note that we still have the MAX_LOCK_DEPTH (48) limit to consider, so anything
that spills that it still up shit creek.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      7531e2f3
    • P
      lockdep: map_acquire · 4f3e7524
      由 Peter Zijlstra 提交于 
      Most the free-standing lock_acquire() usages look remarkably similar, sweep
them into a new helper.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      4f3e7524
    • D
      lockdep: shrink held_lock structure · f82b217e
      由 Dave Jones 提交于 
      struct held_lock {
        u64                        prev_chain_key;       /*     0     8 */
        struct lock_class *        class;                /*     8     8 */
        long unsigned int          acquire_ip;           /*    16     8 */
        struct lockdep_map *       instance;             /*    24     8 */
        int                        irq_context;          /*    32     4 */
        int                        trylock;              /*    36     4 */
        int                        read;                 /*    40     4 */
        int                        check;                /*    44     4 */
        int                        hardirqs_off;         /*    48     4 */

        /* size: 56, cachelines: 1 */
        /* padding: 4 */
        /* last cacheline: 56 bytes */
};

struct held_lock {
        u64                        prev_chain_key;       /*     0     8 */
        long unsigned int          acquire_ip;           /*     8     8 */
        struct lockdep_map *       instance;             /*    16     8 */
        unsigned int               class_idx:11;         /*    24:21  4 */
        unsigned int               irq_context:2;        /*    24:19  4 */
        unsigned int               trylock:1;            /*    24:18  4 */
        unsigned int               read:2;               /*    24:16  4 */
        unsigned int               check:2;              /*    24:14  4 */
        unsigned int               hardirqs_off:1;       /*    24:13  4 */

        /* size: 32, cachelines: 1 */
        /* padding: 4 */
        /* bit_padding: 13 bits */
        /* last cacheline: 32 bytes */
};

[mingo@elte.hu: shrunk hlock->class too]
[peterz@infradead.org: fixup bit sizes]
Signed-off-by: NDave Jones <davej@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
      f82b217e