Re: [PATCH 3/3] mm: page allocator: Drain per-cpu lists afterdirect reclaim allocation fails

From: Dave Chinner
Date: Mon Sep 06 2010 - 00:04:16 EST

Next message: Stephen Rothwell: "linux-next: Tree for September 6"
Previous message: Eric Miao: "Re: [PATCH] ARM: pxa27x_keypad: added a comment to explainclear_wakeup_event callback"
In reply to: Dave Chinner: "Re: [PATCH 3/3] mm: page allocator: Drain per-cpu lists afterdirect reclaim allocation fails"
Next in thread: Mel Gorman: "Re: [PATCH 3/3] mm: page allocator: Drain per-cpu lists afterdirect reclaim allocation fails"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Sun, Sep 05, 2010 at 09:45:54PM +0800, Wu Fengguang wrote:
> [restoring CC list]
>
> On Sun, Sep 05, 2010 at 09:14:47PM +0800, Dave Chinner wrote:
> > On Sun, Sep 05, 2010 at 02:05:39PM +0800, Wu Fengguang wrote:
> > > On Sun, Sep 05, 2010 at 10:15:55AM +0800, Dave Chinner wrote:
> > > > On Sun, Sep 05, 2010 at 09:54:00AM +0800, Wu Fengguang wrote:
> > > > > Dave, could you post (publicly) the kconfig and /proc/vmstat?
> > > > >
> > > > > I'd like to check if you have swap or memory compaction enabled..
> > > >
> > > > Swap is enabled - it has 512MB of swap space:
> > > >
> > > > $ free
> > > > total used free shared buffers cached
> > > > Mem: 4054304 100928 3953376 0 4096 43108
> > > > -/+ buffers/cache: 53724 4000580
> > > > Swap: 497976 0 497976
> > >
> > > It looks swap is not used at all.
> >
> > It isn't 30s after boot, abut I haven't checked after a livelock.
>
> That's fine. I see in your fs_mark-wedge-1.png that there are no
> read/write IO at all when CPUs are 100% busy. So there should be no
> swap IO at "livelock" time.
>
> > > > And memory compaction is not enabled:
> > > >
> > > > $ grep COMPACT .config
> > > > # CONFIG_COMPACTION is not set
>
> Memory compaction is not likely the cause too. It will only kick in for
> order > 3 allocations.
>
> > > >
> > > > The .config is pretty much a 'make defconfig' and then enabling XFS and
> > > > whatever debug I need (e.g. locking, memleak, etc).
> > >
> > > Thanks! The problem seems hard to debug -- you cannot login at all
> > > when it is doing lock contentions, so cannot get sysrq call traces.
> >
> > Well, I don't know whether it is lock contention at all. The sets of
> > traces I have got previously have shown backtraces on all CPUs in
> > direct reclaim with several in draining queues, but no apparent lock
> > contention.
>
> That's interesting. Do you still have the full backtraces?

Just saw one when testing some new code with CONFIG_XFS_DEBUG
enabled. The act of running 'echo t > /proc/sysrq-trigger' seems to
have got the machine unstuck, so I'm not sure if the traces are
completely representative of the livelock state. however, here are
the fs_mark processes:

[ 596.628086] fs_mark R running task 0 2373 2163 0x00000008
[ 596.628086] 0000000000000000 ffffffff81bb8610 00000000000008fc 0000000000000002
[ 596.628086] 0000000000000000 0000000000000296 0000000000000297 ffffffffffffff10
[ 596.628086] ffffffff810b48c2 0000000000000010 0000000000000202 ffff880116b61798
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff810b48c2>] ? smp_call_function_many+0x1a2/0x210
[ 596.628086] [<ffffffff810b48a5>] ? smp_call_function_many+0x185/0x210
[ 596.628086] [<ffffffff81109ff0>] ? drain_local_pages+0x0/0x20
[ 596.628086] [<ffffffff810b4952>] ? smp_call_function+0x22/0x30
[ 596.628086] [<ffffffff81084934>] ? on_each_cpu+0x24/0x50
[ 596.628086] [<ffffffff81108a8c>] ? drain_all_pages+0x1c/0x20
[ 596.628086] [<ffffffff81108fad>] ? __alloc_pages_nodemask+0x42d/0x700
[ 596.628086] [<ffffffff8113d0f2>] ? kmem_getpages+0x62/0x160
[ 596.628086] [<ffffffff8113dce6>] ? fallback_alloc+0x196/0x240
[ 596.628086] [<ffffffff8113da68>] ? ____cache_alloc_node+0x98/0x180
[ 596.628086] [<ffffffff8113e643>] ? __kmalloc+0x193/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] ? kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff812fac80>] ? xfs_log_commit_cil+0x500/0x590
[ 596.628086] [<ffffffff81310943>] ? kmem_zalloc+0x33/0x50
[ 596.628086] [<ffffffff813082d6>] ? _xfs_trans_commit+0x156/0x2f0
[ 596.628086] [<ffffffff8130d50e>] ? xfs_create+0x58e/0x700
[ 596.628086] [<ffffffff8131c587>] ? xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] ? xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] ? vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] ? do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] ? do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2374 2163 0x00000000
[ 596.628086] 0000000000000000 0000000000000002 ffff88011ad619b0 ffff88011fc050c0
[ 596.628086] ffff88011ad619e8 ffffffff8113dce6 ffff88011fc028c0 ffff88011fc02900
[ 596.628086] ffff88011ad619e8 0000025000000000 ffff880100001c08 0000001000000000
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff8113dce6>] ? fallback_alloc+0x196/0x240
[ 596.628086] [<ffffffff8113da68>] ? ____cache_alloc_node+0x98/0x180
[ 596.628086] [<ffffffff8113e643>] ? __kmalloc+0x193/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] ? kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff812fac80>] ? xfs_log_commit_cil+0x500/0x590
[ 596.628086] [<ffffffff81310943>] ? kmem_zalloc+0x33/0x50
[ 596.628086] [<ffffffff813082d6>] ? _xfs_trans_commit+0x156/0x2f0
[ 596.628086] [<ffffffff8130d50e>] ? xfs_create+0x58e/0x700
[ 596.628086] [<ffffffff8131c587>] ? xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] ? xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] ? vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] ? do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] ? do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2375 2163 0x00000000
[ 596.628086] ffff8801198f96f8 ffff880100000000 0000000000000001 0000000000000002
[ 596.628086] ffff8801198f9708 ffffffff8110758a 0000000001320122 0000000000000002
[ 596.628086] ffff8801198f8000 ffff880100000000 0000000000000007 0000000000000250
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff8110758a>] ? zone_watermark_ok+0x2a/0xf0
[ 596.628086] [<ffffffff8103694e>] ? apic_timer_interrupt+0xe/0x20
[ 596.628086] [<ffffffff810b48c6>] ? smp_call_function_many+0x1a6/0x210
[ 596.628086] [<ffffffff810b48a5>] ? smp_call_function_many+0x185/0x210
[ 596.628086] [<ffffffff81109ff0>] ? drain_local_pages+0x0/0x20
[ 596.628086] [<ffffffff810b4952>] ? smp_call_function+0x22/0x30
[ 596.628086] [<ffffffff81084934>] ? on_each_cpu+0x24/0x50
[ 596.628086] [<ffffffff81108a8c>] ? drain_all_pages+0x1c/0x20
[ 596.628086] [<ffffffff81108fad>] ? __alloc_pages_nodemask+0x42d/0x700
[ 596.628086] [<ffffffff8113d0f2>] ? kmem_getpages+0x62/0x160
[ 596.628086] [<ffffffff8113dce6>] ? fallback_alloc+0x196/0x240
[ 596.628086] [<ffffffff8113da68>] ? ____cache_alloc_node+0x98/0x180
[ 596.628086] [<ffffffff8113e643>] ? __kmalloc+0x193/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] ? kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff812fac80>] ? xfs_log_commit_cil+0x500/0x590
[ 596.628086] [<ffffffff81310943>] ? kmem_zalloc+0x33/0x50
[ 596.628086] [<ffffffff813082d6>] ? _xfs_trans_commit+0x156/0x2f0
[ 596.628086] [<ffffffff8130d50e>] ? xfs_create+0x58e/0x700
[ 596.628086] [<ffffffff8131c587>] ? xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] ? xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] ? vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] ? do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] ? do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2376 2163 0x00000000
[ 596.628086] ffff88011d303708 ffffffff8110758a 0000000001320122 0000000000000002
[ 596.628086] ffff88011d302000 ffff880100000000 0000000000000007 0000000000000250
[ 596.628086] ffffffff8103694e ffff88011d3037d8 ffff88011c9808f8 0000000000000001
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff8110758a>] ? zone_watermark_ok+0x2a/0xf0
[ 596.628086] [<ffffffff8103694e>] ? apic_timer_interrupt+0xe/0x20
[ 596.628086] [<ffffffff810b48c2>] ? smp_call_function_many+0x1a2/0x210
[ 596.628086] [<ffffffff810b48a5>] ? smp_call_function_many+0x185/0x210
[ 596.628086] [<ffffffff81109ff0>] ? drain_local_pages+0x0/0x20
[ 596.628086] [<ffffffff810b4952>] ? smp_call_function+0x22/0x30
[ 596.628086] [<ffffffff81084934>] ? on_each_cpu+0x24/0x50
[ 596.628086] [<ffffffff81108a8c>] ? drain_all_pages+0x1c/0x20
[ 596.628086] [<ffffffff81108fad>] ? __alloc_pages_nodemask+0x42d/0x700
[ 596.628086] [<ffffffff8113d0f2>] ? kmem_getpages+0x62/0x160
[ 596.628086] [<ffffffff8113dce6>] ? fallback_alloc+0x196/0x240
[ 596.628086] [<ffffffff8113da68>] ? ____cache_alloc_node+0x98/0x180
[ 596.628086] [<ffffffff8113e643>] ? __kmalloc+0x193/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] ? kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff812fac80>] ? xfs_log_commit_cil+0x500/0x590
[ 596.628086] [<ffffffff81310943>] ? kmem_zalloc+0x33/0x50
[ 596.628086] [<ffffffff813082d6>] ? _xfs_trans_commit+0x156/0x2f0
[ 596.628086] [<ffffffff8130d50e>] ? xfs_create+0x58e/0x700
[ 596.628086] [<ffffffff8131c587>] ? xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] ? xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] ? vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] ? do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] ? do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2377 2163 0x00000008
[ 596.628086] 0000000000000000 ffff880103dd9528 ffffffff813f2deb 000000000000003f
[ 596.628086] ffff88011c9806e0 ffff880103dd95a4 ffff880103dd9518 ffffffff813fd98e
[ 596.628086] ffff880103dd95a4 ffff88011ce51800 ffff880103dd9528 ffffffff8180722e
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff813f2deb>] ? radix_tree_gang_lookup_tag+0x8b/0x100
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8180722e>] ? _raw_spin_unlock+0xe/0x10
[ 596.628086] [<ffffffff8131f318>] ? xfs_inode_ag_iter_next_pag+0x108/0x110
[ 596.628086] [<ffffffff8132018c>] ? xfs_reclaim_inode_shrink+0x4c/0x90
[ 596.628086] [<ffffffff81119d02>] ? zone_nr_free_pages+0xa2/0xc0
[ 596.628086] [<ffffffff8110758a>] ? zone_watermark_ok+0x2a/0xf0
[ 596.628086] [<ffffffff8103694e>] ? apic_timer_interrupt+0xe/0x20
[ 596.628086] [<ffffffff810b48c2>] ? smp_call_function_many+0x1a2/0x210
[ 596.628086] [<ffffffff810b48a5>] ? smp_call_function_many+0x185/0x210
[ 596.628086] [<ffffffff81109ff0>] ? drain_local_pages+0x0/0x20
[ 596.628086] [<ffffffff810b4952>] ? smp_call_function+0x22/0x30
[ 596.628086] [<ffffffff81084934>] ? on_each_cpu+0x24/0x50
[ 596.628086] [<ffffffff81108a8c>] ? drain_all_pages+0x1c/0x20
[ 596.628086] [<ffffffff81108fad>] ? __alloc_pages_nodemask+0x42d/0x700
[ 596.628086] [<ffffffff8113d0f2>] ? kmem_getpages+0x62/0x160
[ 596.628086] [<ffffffff8113dce6>] ? fallback_alloc+0x196/0x240
[ 596.628086] [<ffffffff8113da68>] ? ____cache_alloc_node+0x98/0x180
[ 596.628086] [<ffffffff8113e643>] ? __kmalloc+0x193/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] ? kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff812fac80>] ? xfs_log_commit_cil+0x500/0x590
[ 596.628086] [<ffffffff81310943>] ? kmem_zalloc+0x33/0x50
[ 596.628086] [<ffffffff813082d6>] ? _xfs_trans_commit+0x156/0x2f0
[ 596.628086] [<ffffffff8130b2f9>] ? xfs_dir_ialloc+0x139/0x340
[ 596.628086] [<ffffffff812f9cc7>] ? xfs_log_reserve+0x167/0x1e0
[ 596.628086] [<ffffffff8130d35c>] ? xfs_create+0x3dc/0x700
[ 596.628086] [<ffffffff8131c587>] ? xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] ? xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] ? vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] ? do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] ? do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2378 2163 0x00000000
[ 596.628086] ffff880103d53a78 0000000000000086 ffff8800a3fc6cc0 0000000000000caf
[ 596.628086] ffff880103d53a18 00000000000135c0 ffff88011f119040 00000000000135c0
[ 596.628086] ffff88011f1193a8 ffff880103d53fd8 ffff88011f1193b0 ffff880103d53fd8
[ 596.628086] Call Trace8f/0xe0
[ 596.628086] [<ffffffff810773ca>] __cond_resched+0x2a/0x40
[ 596.628086] [<ffffffff8113e4f8>] ? __kmalloc+0x48/0x230
[ 596.628086] [<ffffffff81804d90>] _cond_resched+0x30/0x40
[ 596.628086] [<ffffffff8113e5e1>] __kmalloc+0x131/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff81306b75>] xfs_trans_alloc_log_vecs+0xa5/0xe0
[ 596.628086] [<ffffffff813082b8>] _xfs_trans_commit+0x138/0x2f0
[ 596.628086] [<ffffffff8130d50e>] xfs_create+0x58e/0x700
[ 596.628086] [<ffffffff8131c587>] xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2379 2163 0x00000000
[ 596.628086] ffff88011f0ddd80 ffff880103da5eb8 000001b600008243 ffff88008652ca80
[ 596.628086] ffffffff8115f8fa 00007fff71ba9370 ffff880000000005 ffff88011e35cb80
[ 596.628086] ffff880076835ed0 ffff880103da5f18 0000000000000005 ffff88006d30b000
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b
[ 596.628086] fs_mark R running task 0 2380 2163 0x00000000
[ 596.628086] 00000000000008fc 0000000000000001 0000000000000000 0000000000000296
[ 596.628086] 0000000000000293 ffffffffffffff10 ffffffff810b48c2 0000000000000010
[ 596.628086] 0000000000000202 ffff880103c05798 0000000000000018 ffffffff810b48a5
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff810b48c2>] ? smp_call_function_many+0x1a2/0x210
[ 596.628086] [<ffffffff810b48a5>] ? smp_call_function_many+0x185/0x210
[ 596.628086] [<ffffffff81109ff0>] ? drain_local_pages+0x0/0x20
[ 596.628086] [<ffffffff810b4952>] ? smp_call_function+0x22/0x30
[ 596.628086] [<ffffffff81084934>] ? on_each_cpu+0x24/0x50
[ 596.628086] [<ffffffff81108a8c>] ? drain_all_pages+0x1c/0x20
[ 596.628086] [<ffffffff81108fad>] ? __alloc_pages_nodemask+0x42d/0x700
[ 596.628086] [<ffffffff8113d0f2>] ? kmem_getpages+0x62/0x160
[ 596.628086] [<ffffffff8113dce6>] ? fallback_alloc+0x196/0x240
[ 596.628086] [<ffffffff8113da68>] ? ____cache_alloc_node+0x98/0x180
[ 596.628086] [<ffffffff8113e643>] ? __kmalloc+0x193/0x230
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131083f>] ? kmem_alloc+0x8f/0xe0
[ 596.628086] [<ffffffff8131092e>] ? kmem_zalloc+0x1e/0x50
[ 596.628086] [<ffffffff812fac80>] ? xfs_log_commit_cil+0x500/0x590
[ 596.628086] [<ffffffff81310943>] ? kmem_zalloc+0x33/0x50
[ 596.628086] [<ffffffff813082d6>] ? _xfs_trans_commit+0x156/0x2f0
[ 596.628086] [<ffffffff8130d50e>] ? xfs_create+0x58e/0x700
[ 596.628086] [<ffffffff8131c587>] ? xfs_vn_mknod+0xa7/0x1c0
[ 596.628086] [<ffffffff8131c6d0>] ? xfs_vn_create+0x10/0x20
[ 596.628086] [<ffffffff81151f48>] ? vfs_create+0xb8/0xf0
[ 596.628086] [<ffffffff8115273c>] ? do_last+0x4dc/0x5d0
[ 596.628086] [<ffffffff81154937>] ? do_filp_open+0x207/0x5e0
[ 596.628086] [<ffffffff8115b7bc>] ? d_lookup+0x3c/0x60
[ 596.628086] [<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[ 596.628086] [<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[ 596.628086] [<ffffffff8115f8fa>] ? alloc_fd+0xfa/0x140
[ 596.628086] [<ffffffff811448a5>] ? do_sys_open+0x65/0x130
[ 596.628086] [<ffffffff811449b0>] ? sys_open+0x20/0x30
[ 596.628086] [<ffffffff81036032>] ? system_call_fastpath+0x16/0x1b

and the kswapd thread:

[ 596.628086] kswapd0 R running task 0 547 2 0x00000000
[ 596.628086] ffff88011e78fbc0 0000000000000046 0000000000000000 ffffffff8103694e
[ 596.628086] ffff88011e78fbf0 00000000000135c0 ffff88011f17c040 00000000000135c0
[ 596.628086] ffff88011f17c3a8 ffff88011e78ffd8 ffff88011f17c3b0 ffff88011e78ffd8
[ 596.628086] Call Trace:
[ 596.628086] [<ffffffff8103694e>] ? apic_timer_interrupt+0xe/0x20
[ 596.628086] [<ffffffff8103694e>] ? apic_timer_interrupt+0xe/0x20
[ 596.628086] [<ffffffff810773ca>] __cond_resched+0x2a/0x40
[ 596.628086] [<ffffffff81077422>] __cond_resched_lock+0x42/0x60
[ 596.628086] [<ffffffff811593a0>] __shrink_dcache_sb+0xf0/0x380
[ 596.628086] [<ffffffff811597c6>] shrink_dcache_memory+0x176/0x200
[ 596.628086] [<ffffffff81110bf4>] shrink_slab+0x124/0x180
[ 596.628086] [<ffffffff811125d2>] balance_pgdat+0x2e2/0x540
[ 596.628086] [<ffffffff8111295d>] kswapd+0x12d/0x390
[ 596.628086] [<ffffffff8109e8c0>] ? autoremove_wake_function+0x0/0x40
[ 596.628086] [<ffffffff81112830>] ? kswapd+0x0/0x390
[ 596.628086] [<ffffffff8109e396>] kthread+0x96/0xa0
[ 596.628086] [<ffffffff81036da4>] kernel_thread_helper+0x4/0x10
[ 596.628086] [<ffffffff8109e300>] ? kthread+0x0/0xa0
[ 596.628086] [<ffffffff81036da0>] ? kernel_thread_helper+0x0/0x10

I just went to grab the CAL counters, and found the system in
another livelock. This time I managed to start the sysrq-trigger
dump while the livelock was in progress - I basÑcally got one shot
at a command before everything stopped responding. Now I'm waiting
for the livelock to pass.... 5min.... the fs_mark workload
has stopped (ctrl-c finally responded), still livelocked....
10min.... 15min.... 20min.... OK, back now.

Interesting - all the fs_mark processes are in D state waiting on IO
completion processing. And the only running processes are the
kworker threads, which are all processing either vmstat updates
(3 CPUs):

kworker/6:1 R running task 0 376 2 0x00000000
ffff88011f255cf0 0000000000000046 ffff88011f255c90 ffffffff813fda34
ffff88003c969588 00000000000135c0 ffff88011f27c7f0 00000000000135c0
ffff88011f27cb58 ffff88011f255fd8 ffff88011f27cb60 ffff88011f255fd8
Call Trace:
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff810773ca>] __cond_resched+0x2a/0x40
[<ffffffff81804d90>] _cond_resched+0x30/0x40
[<ffffffff8111ab12>] refresh_cpu_vm_stats+0xc2/0x160
[<ffffffff8111abb0>] ? vmstat_update+0x0/0x40
[<ffffffff8111abc6>] vmstat_update+0x16/0x40
[<ffffffff810978a0>] process_one_work+0x130/0x470
[<ffffffff81099e72>] worker_thread+0x172/0x3f0
[<ffffffff81099d00>] ? worker_thread+0x0/0x3f0
[<ffffffff8109e396>] kthread+0x96/0xa0
[<ffffffff81036da4>] kernel_thread_helper+0x4/0x10
[<ffffffff8109e300>] ? kthread+0x0/0xa0
[<ffffffff81036da0>] ? kernel_thread_helper+0x0/0x10

Or doing inode IO completion processing:

kworker/7:1 R running task 0 377 2 0x00000000
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] ffffffffffffff10 0000000000000001 ffffffffffffff10 ffffffff813f8062
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] 0000000000000010 0000000000000202 ffff88011f0ffc80 ffffffff813f8067
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] 00000000000ac613 ffff88011ba08280 00000000871803d0 0000000000000001
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] Call Trace:
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813f8062>] ? delay_tsc+0x22/0x80
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813f808a>] ? delay_tsc+0x4a/0x80
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813f7fdf>] ? __delay+0xf/0x20
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813fdb03>] ? do_raw_spin_lock+0x123/0x160
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff818072be>] ? _raw_spin_lock+0xe/0x10
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff812f0244>] ? xfs_iflush_done+0x84/0xb0
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813157c0>] ? xfs_buf_iodone_work+0x0/0x100
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff812cee54>] ? xfs_buf_do_callbacks+0x54/0x70
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff812cf0c0>] ? xfs_buf_iodone_callbacks+0x1a0/0x2a0
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813157c0>] ? xfs_buf_iodone_work+0x0/0x100
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff81315805>] ? xfs_buf_iodone_work+0x45/0x100
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff813157c0>] ? xfs_buf_iodone_work+0x0/0x100
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff810978a0>] ? process_one_work+0x130/0x470
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff81099e72>] ? worker_thread+0x172/0x3f0
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff81099d00>] ? worker_thread+0x0/0x3f0
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff8109e396>] ? kthread+0x96/0xa0
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff81036da4>] ? kernel_thread_helper+0x4/0x10
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff8109e300>] ? kthread+0x0/0xa0
Sep 6 13:20:47 test-4 kernel: [ 2114.056017] [<ffffffff81036da0>] ? kernel_thread_helper+0x0/0x10

It looks like there is spinlock contention occurring here on the xfs
AIL lock, so I'll need to look into this further. A second set of
traces I got during the livelock also showed this:

fs_mark R running task 0 2713 1 0x00000004
ffff88011851b518 ffffffff81804669 ffff88011851b4d8 ffff880100000700
0000000000000000 00000000000135c0 ffff88011f05b7f0 00000000000135c0
ffff88011f05bb58 ffff88011851bfd8 ffff88011f05bb60 ffff88011851bfd8
Call Trace:
[<ffffffff81804669>] ? schedule+0x3c9/0x9f0
[<ffffffff81805235>] schedule_timeout+0x1d5/0x2a0
[<ffffffff81119d02>] ? zone_nr_free_pages+0xa2/0xc0
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff8110758a>] ? zone_watermark_ok+0x2a/0xf0
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff81807275>] ? _raw_spin_lock_irq+0x15/0x20
[<ffffffff81806638>] __down+0x78/0xb0
[<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[<ffffffff8180722e>] ? _raw_spin_unlock+0xe/0x10
[<ffffffff8113d8e6>] cache_alloc_refill+0x1c6/0x2b0
[<ffffffff813fda34>] do_raw_spin_lock+0x54/0x160
[<ffffffff812e9672>] ? xfs_iext_bno_to_irec+0xb2/0x100
[<ffffffff811022ce>] ? find_get_page+0x1e/0xa0
[<ffffffff81103dd7>] ? find_lock_page+0x37/0x80
[<ffffffff8110438f>] ? find_or_create_page+0x3f/0xb0
[<ffffffff811025e7>] ? unlock_page+0x27/0x30
[<ffffffff81315167>] ? _xfs_buf_lookup_pages+0x297/0x370
[<ffffffff813f808a>] ? delay_tsc+0x4a/0x80
[<ffffffff813f7fdf>] ? __delay+0xf/0x20
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[<ffffffff8180722e>] ? _raw_spin_unlock+0xe/0x10
[<ffffffff81109e69>] ? free_pcppages_bulk+0x369/0x400
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[<ffffffff8180722e>] ? _raw_spin_unlock+0xe/0x10
[<ffffffff81109e69>] ? free_pcppages_bulk+0x369/0x400
[<ffffffff8110a508>] ? __pagevec_free+0x58/0xb0
[<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[<ffffffff810af53c>] ? debug_mutex_add_waiter+0x2c/0x70
[<ffffffff81805d70>] ? __mutex_lock_slowpath+0x1e0/0x280
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff8180722e>] ? _raw_spin_unlock+0xe/0x10
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff810fdac2>] ? perf_event_exit_task+0x32/0x160
[<ffffffff813fd772>] ? do_raw_write_lock+0x42/0xa0
[<ffffffff81807015>] ? _raw_write_lock_irq+0x15/0x20
[<ffffffff81082315>] ? do_exit+0x195/0x7c0
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff81082991>] ? do_group_exit+0x51/0xc0
[<ffffffff81092d8c>] ? get_signal_to_deliver+0x27c/0x430
[<ffffffff810352b5>] ? do_signal+0x75/0x7c0
[<ffffffff8105fc58>] ? pvclock_clocksource_read+0x58/0xd0
[<ffffffff813fda34>] ? do_raw_spin_lock+0x54/0x160
[<ffffffff813fd98e>] ? do_raw_spin_unlock+0x5e/0xb0
[<ffffffff8180722e>] ? _raw_spin_unlock+0xe/0x10
[<ffffffff81035a65>] ? do_notify_resume+0x65/0x90
[<ffffffff81036283>] ? int_signal+0x12/0x17

Because I tried to ctrl-c the fs_mark workload. All those lock
traces on the stack aren't related to XFS, so I'm wondering exactly
where they have come from....

Finally, /proc/interrupts shows:

CAL: 12156 12039 12676 12478 12919 12177 12767 12460 Function call interrupts

Which shows that this wasn't an IPI storm that caused this
particular livelock.

Cheers,

Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Next message: Stephen Rothwell: "linux-next: Tree for September 6"
Previous message: Eric Miao: "Re: [PATCH] ARM: pxa27x_keypad: added a comment to explainclear_wakeup_event callback"
In reply to: Dave Chinner: "Re: [PATCH 3/3] mm: page allocator: Drain per-cpu lists afterdirect reclaim allocation fails"
Next in thread: Mel Gorman: "Re: [PATCH 3/3] mm: page allocator: Drain per-cpu lists afterdirect reclaim allocation fails"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]