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SubjectRe: [2.6.37-rc1, OOM] virtblk: OOM in do_virtblk_request()
Rusty, Michael,

any comments? I think Dave's observation is correct, and the lack of
a mempool for allocations in the virtio stack is a no-go for virtio_blk.

On Fri, Nov 05, 2010 at 12:30:03PM +1100, Dave Chinner wrote:
> Folks,
>
> Running an IO test with lots of concurrent metadata modifications
> and IO under memory pressure, I hit this OOM report:
>
> [ 367.866979] xfsbufd/vdb: page allocation failure. order:0, mode:0x20
> [ 367.868030] Pid: 2145, comm: xfsbufd/vdb Not tainted 2.6.36-dgc+ #634
> [ 367.868030] Call Trace:
> [ 367.868030] [<ffffffff811204ee>] __alloc_pages_nodemask+0x65e/0x760
> [ 367.868030] [<ffffffff811585f2>] kmem_getpages+0x62/0x160
> [ 367.868030] [<ffffffff8115960f>] fallback_alloc+0x18f/0x270
> [ 367.868030] [<ffffffff8115939b>] ____cache_alloc_node+0x9b/0x180
> [ 367.868030] [<ffffffff811592bc>] ? cache_alloc_refill+0x21c/0x260
> [ 367.868030] [<ffffffff8115999b>] __kmalloc+0x1cb/0x240
> [ 367.868030] [<ffffffff8172b891>] ? virtqueue_add_buf_gfp+0x221/0x410
> [ 367.868030] [<ffffffff8172b891>] virtqueue_add_buf_gfp+0x221/0x410
> [ 367.868030] [<ffffffff81696771>] ? blk_rq_map_sg+0x81/0x2d0
> [ 367.868030] [<ffffffff81888333>] do_virtblk_request+0x1f3/0x400
> [ 367.868030] [<ffffffff8168ef1a>] __generic_unplug_device+0x3a/0x50
> [ 367.868030] [<ffffffff8168b1ee>] elv_insert+0x8e/0x1b0
> [ 367.868030] [<ffffffff8168b35a>] __elv_add_request+0x4a/0x90
> [ 367.868030] [<ffffffff81691cf0>] __make_request+0x120/0x500
> [ 367.868030] [<ffffffff81159c44>] ? kmem_cache_alloc+0xb4/0x1e0
> [ 367.868030] [<ffffffff8168fb16>] generic_make_request+0x266/0x550
> [ 367.868030] [<ffffffff8111b985>] ? mempool_alloc_slab+0x15/0x20
> [ 367.868030] [<ffffffff814a9989>] ? xfs_buf_delwri_split+0x1a9/0x1c0
> [ 367.868030] [<ffffffff81063779>] ? kvm_clock_read+0x19/0x20
> [ 367.868030] [<ffffffff8168fe65>] submit_bio+0x65/0xe0
> [ 367.868030] [<ffffffff814a915c>] _xfs_buf_ioapply+0x18c/0x360
> [ 367.868030] [<ffffffff814ababd>] ? xfs_bdstrat_cb+0x5d/0xb0
> [ 367.868030] [<ffffffff814ab62f>] xfs_buf_iorequest+0x4f/0xd0
> [ 367.868030] [<ffffffff814ababd>] xfs_bdstrat_cb+0x5d/0xb0
> [ 367.868030] [<ffffffff814abe5f>] xfsbufd+0x10f/0x190
> [ 367.868030] [<ffffffff814abd50>] ? xfsbufd+0x0/0x190
> [ 367.868030] [<ffffffff810a6f16>] kthread+0xa6/0xb0
> [ 367.868030] [<ffffffff8103ae64>] kernel_thread_helper+0x4/0x10
> [ 367.868030] [<ffffffff81b10f90>] ? restore_args+0x0/0x30
> [ 367.868030] [<ffffffff810a6e70>] ? kthread+0x0/0xb0
> [ 367.868030] [<ffffffff8103ae60>] ? kernel_thread_helper+0x0/0x10
> [ 367.868030] Mem-Info:
> [ 367.868030] Node 0 DMA per-cpu:
> [ 367.868030] CPU 0: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 1: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 2: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 3: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 4: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 5: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 6: hi: 0, btch: 1 usd: 0
> [ 367.868030] CPU 7: hi: 0, btch: 1 usd: 0
> [ 367.868030] Node 0 DMA32 per-cpu:
> [ 367.868030] CPU 0: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 1: hi: 186, btch: 31 usd: 23
> [ 367.868030] CPU 2: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 3: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 4: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 5: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 6: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 7: hi: 186, btch: 31 usd: 0
> [ 367.868030] Node 0 Normal per-cpu:
> [ 367.868030] CPU 0: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 1: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 2: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 3: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 4: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 5: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 6: hi: 186, btch: 31 usd: 0
> [ 367.868030] CPU 7: hi: 186, btch: 31 usd: 0
> [ 367.868030] active_anon:19790 inactive_anon:4264 isolated_anon:0
> [ 367.868030] active_file:19793 inactive_file:36538 isolated_file:32
> [ 367.868030] unevictable:0 dirty:0 writeback:0 unstable:0
> [ 367.868030] free:0 slab_reclaimable:795356 slab_unreclaimable:118472
> [ 367.868030] mapped:180 shmem:22 pagetables:523 bounce:0
> [ 367.868030] Node 0 DMA free:0kB min:28kB low:32kB high:40kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:14804kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15684kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:4kB slab_unreclaimable:1024kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:1828 all_unreclaimable? no
> [ 367.868030] lowmem_reserve[]: 0 3512 4017 4017
> [ 367.868030] Node 0 DMA32 free:0kB min:7076kB low:8844kB high:10612kB active_anon:77920kB inactive_anon:15648kB active_file:65824kB inactive_file:109788kB unevictable:0kB isolated(anon):0kB isolated(file):128kB present:3596500kB mlocked:0kB dirty:0kB writeback:0kB mapped:236kB shmem:0kB slab_reclaimable:2866144kB slab_unreclaimable:409596kB kernel_stack:80kB pagetables:372kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:26652 all_unreclaimable? no
> [ 367.868030] lowmem_reserve[]: 0 0 505 505
> [ 367.868030] Node 0 Normal free:0kB min:1016kB low:1268kB high:1524kB active_anon:1240kB inactive_anon:1408kB active_file:13348kB inactive_file:21560kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:517120kB mlocked:0kB dirty:0kB writeback:0kB mapped:484kB shmem:88kB slab_reclaimable:315276kB slab_unreclaimable:63268kB kernel_stack:1176kB pagetables:1720kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:5375 all_unreclaimable? no
> [ 367.868030] lowmem_reserve[]: 0 0 0 0
> [ 367.868030] Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
> [ 367.868030] Node 0 DMA32: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
> [ 367.868030] Node 0 Normal: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
> [ 367.868030] 56938 total pagecache pages
> [ 367.868030] 388 pages in swap cache
> [ 367.868030] Swap cache stats: add 16495, delete 16107, find 524/722
> [ 367.868030] Free swap = 443928kB
> [ 367.868030] Total swap = 497976kB
> [ 367.868030] 1048560 pages RAM
> [ 367.868030] 41977 pages reserved
> [ 367.868030] 51560 pages shared
> [ 367.868030] 949431 pages non-shared
>
> Basically, the system is _completely_ out of free pages, and failing
> allocations in the XFS metadata writeback path that could free up
> memory.
>
> I note that the code path in question in the virtio driver is doing
> GFP_ATOMIC allocations for the indirect ring structures. However,
> these allocations are not backed by a mempool and hence the system
> OOMs rather than makes slow progress. Shouldn't this path be using a
> mempool?
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@fromorbit.com
> --
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