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Date: Mon, 6 Sep 2010 14:02:43 +1000 From: Dave Chinner <david@...morbit.com> To: Wu Fengguang <fengguang.wu@...el.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mel@....ul.ie>, Linux Kernel List <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Minchan Kim <minchan.kim@...il.com>, Christoph Lameter <cl@...ux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, David Rientjes <rientjes@...gle.com> Subject: Re: [PATCH 3/3] mm: page allocator: Drain per-cpu lists after direct reclaim allocation fails 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 basŃ–cally 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@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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