On Mon, Sep 06, 2010 at 02:02:43PM +1000, Dave Chinner wrote:
> 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.
sysrq-trigger would alter the timing of at least one of the direct
reclaimers. It's vaguely possible this was enough of a backoff to allow
further progress.
> 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
This looks like an order-0 allocation. The "Drain per-cpu lists after
direct reclaim allocation fails" avoids calling drain_all_pages() for a
number of cases but introduces a case where it's called for order-0
pages. The intention was to avoid allocations failing just because of
the lists but maybe it's happening too often.
I include a patch at the very end of this mail that might relieve this.
> [ 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
>
Many do seem to either be calling drain_all_pages or have done it
recently enough to see sharpnel from it in the backtrace.
> 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 bas??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.
Very interesting, maybe they are all stuck in congestion_wait() this
time? There are a few sources where that is possible.
> 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.
>
No, but it's possible we got stuck somewhere like too_many_isolated() or
in congestion_wait. One thing at a time though, would you mind testing
the following patch? I haven't tested this *at all* but it should reduce
the number of times drain_all_pages() are called further while not
eliminating them entirely.
I expect to make a start soon on trying to reproduce the problem with fs_mark
but I'm waiting on a machine to free up so it could be a while.
==== CUT HERE ====
mm: page allocator: Reduce the instances where drain_all_pages() is called
When a page allocation fails after direct reclaim, the per-cpu lists are
drained and another attempt made to allocate. On very large systems,
this can cause IPI storms. This patch restores old behaviour to call
drain_all_pages() after direct reclaim fails only for high-order
allocations. It's still the case that an allocation can fail because the
necessary pages are pinned in the per-cpu list. After this patch, the
lists are only drained as a last-resort before calling the OOM killer.
Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
---
mm/page_alloc.c | 21 ++++++++++++++++++---
1 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 750e1dc..0599cf7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1737,6 +1737,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
int migratetype)
{
struct page *page;
+ bool drained = false;
/* Acquire the OOM killer lock for the zones in zonelist */
if (!try_set_zonelist_oom(zonelist, gfp_mask)) {
@@ -1744,6 +1745,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
return NULL;
}
+retry:
/*
* Go through the zonelist yet one more time, keep very high watermark
* here, this is only to catch a parallel oom killing, we must fail if
@@ -1773,6 +1775,18 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
if (gfp_mask & __GFP_THISNODE)
goto out;
}
+
+ /*
+ * If an allocation failed, it could be because pages are pinned on
+ * the per-cpu lists. Before resorting to the OOM killer, try
+ * draining
+ */
+ if (!drained) {
+ drain_all_pages();
+ drained = true;
+ goto retry;
+ }
+
/* Exhausted what can be done so it's blamo time */
out_of_memory(zonelist, gfp_mask, order, nodemask);
@@ -1876,10 +1890,11 @@ retry:
migratetype);
/*
- * If an allocation failed after direct reclaim, it could be because
- * pages are pinned on the per-cpu lists. Drain them and try again
+ * If a high-order allocation failed after direct reclaim, it could
+ * be because pages are pinned on the per-cpu lists. Drain them once
+ * and try again
*/
- if (!page && !drained) {
+ if (!page && !drained && order != 0) {
drain_all_pages();
drained = true;
goto retry;
--
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