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SubjectRe: Found the commit that causes the OOMs
On Mon, Jun 29, 2009 at 11:00:26PM +0800, Minchan Kim wrote:
> On Mon, Jun 29, 2009 at 11:21 PM, David Howells<dhowells@redhat.com> wrote:
> > Wu Fengguang <fengguang.wu@intel.com> wrote:
> >
> >> Sorry! This one compiles OK:
> >
> > Sadly that doesn't seem to work either:
> >
> > msgctl11 invoked oom-killer: gfp_mask=0x200da, order=0, oom_adj=0
> > msgctl11 cpuset=/ mems_allowed=0
> > Pid: 30858, comm: msgctl11 Not tainted 2.6.31-rc1-cachefs #146
> > Call Trace:
> >  [<ffffffff8107207e>] ? oom_kill_process.clone.0+0xa9/0x245
> >  [<ffffffff81072345>] ? __out_of_memory+0x12b/0x142
> >  [<ffffffff810723c6>] ? out_of_memory+0x6a/0x94
> >  [<ffffffff81074a90>] ? __alloc_pages_nodemask+0x42e/0x51d
> >  [<ffffffff81080843>] ? do_wp_page+0x2c6/0x5f5
> >  [<ffffffff810820c1>] ? handle_mm_fault+0x5dd/0x62f
> >  [<ffffffff81022c32>] ? do_page_fault+0x1f8/0x20d
> >  [<ffffffff812e069f>] ? page_fault+0x1f/0x30
> > Mem-Info:
> > DMA per-cpu:
> > CPU    0: hi:    0, btch:   1 usd:   0
> > CPU    1: hi:    0, btch:   1 usd:   0
> > DMA32 per-cpu:
> > CPU    0: hi:  186, btch:  31 usd:  38
> > CPU    1: hi:  186, btch:  31 usd: 106
> > Active_anon:75040 active_file:0 inactive_anon:2031
> >  inactive_file:0 unevictable:0 dirty:0 writeback:0 unstable:0
> >  free:1951 slab:41499 mapped:301 pagetables:60674 bounce:0
> > DMA free:3932kB min:60kB low:72kB high:88kB active_anon:2868kB inactive_anon:384kB active_file:0kB inactive_file:0kB unevictable:0kB present:15364kB pages_scanned:0 all_unreclaimable? no
> > lowmem_reserve[]: 0 968 968 968
> > DMA32 free:3872kB min:3948kB low:4932kB high:5920kB active_anon:297292kB inactive_anon:7740kB active_file:0kB inactive_file:0kB unevictable:0kB present:992032kB pages_scanned:0 all_unreclaimable? no
> > lowmem_reserve[]: 0 0 0 0
> > DMA: 7*4kB 0*8kB 0*16kB 0*32kB 1*64kB 0*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 3932kB
> > DMA32: 500*4kB 2*8kB 0*16kB 0*32kB 1*64kB 0*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 3872kB
> > 1928 total pagecache pages
> > 0 pages in swap cache
> > Swap cache stats: add 0, delete 0, find 0/0
> > Free swap  = 0kB
> > Total swap = 0kB
> > 255744 pages RAM
> > 5589 pages reserved
> > 238251 pages shared
> > 216210 pages non-shared
> > Out of memory: kill process 25221 (msgctl11) score 130560 or a child
> > Killed process 26379 (msgctl11)
>
> Totally, I can't understand this situation.
> Now, this page allocation is order zero and It is just likely GFP_HIGHUSER.
> So it's unlikely interrupt context.
>
> Buddy already has enough fallback DMA32, I think.
> Why kernel can't allocate page for order 0 ?
> Is it allocator bug ?

Yes this time the OOM order/flags are much different from all previous OOMs.

btw, I found that msgctl11 is pretty good at making a lot of SUnreclaim and PageTables pages:

before during 1 during 2 after

MemTotal: 3931880 kB MemTotal: 3931880 kB MemTotal: 3931880 kB MemTotal: 3931880 kB
MemFree: 985944 kB MemFree: 1489364 kB MemFree: 2069184 kB MemFree: 2853900 kB
Buffers: 41704 kB Buffers: 16080 kB Buffers: 16104 kB Buffers: 16200 kB
Cached: 1899740 kB Cached: 126780 kB Cached: 129092 kB Cached: 130552 kB
SwapCached: 0 kB SwapCached: 0 kB SwapCached: 0 kB SwapCached: 0 kB
Active: 402420 kB Active: 812320 kB Active: 643868 kB Active: 354880 kB
Inactive: 2325644 kB Inactive: 576732 kB Inactive: 578792 kB Inactive: 579640 kB
Active(anon): 333720 kB Active(anon): 781264 kB Active(anon): 612632 kB Active(anon): 323448 kB
Inactive(anon): 470764 kB Inactive(anon): 482792 kB Inactive(anon): 482680 kB Inactive(anon): 482268 kB
Active(file): 68700 kB Active(file): 31056 kB Active(file): 31236 kB Active(file): 31432 kB
Inactive(file): 1854880 kB Inactive(file): 93940 kB Inactive(file): 96112 kB Inactive(file): 97372 kB
Unevictable: 4 kB Unevictable: 4 kB Unevictable: 4 kB Unevictable: 4 kB
Mlocked: 4 kB Mlocked: 4 kB Mlocked: 4 kB Mlocked: 4 kB
SwapTotal: 0 kB SwapTotal: 0 kB SwapTotal: 0 kB SwapTotal: 0 kB
SwapFree: 0 kB SwapFree: 0 kB SwapFree: 0 kB SwapFree: 0 kB
Dirty: 996 kB Dirty: 536 kB Dirty: 1348 kB Dirty: 212 kB
Writeback: 0 kB Writeback: 0 kB Writeback: 0 kB Writeback: 0 kB
AnonPages: 786772 kB AnonPages: 1246280 kB AnonPages: 1077352 kB AnonPages: 787856 kB
Mapped: 53504 kB Mapped: 50420 kB Mapped: 50668 kB Mapped: 50716 kB
Slab: 159340 kB Slab: 339708 kB Slab: 227164 kB Slab: 85272 kB
SReclaimable: 125152 kB SReclaimable: 49188 kB SReclaimable: 48944 kB SReclaimable: 48508 kB
SUnreclaim: 34188 kB SUnreclaim: 290520 kB SUnreclaim: 178220 kB SUnreclaim: 36764 kB
PageTables: 17068 kB PageTables: 363716 kB PageTables: 204336 kB PageTables: 16620 kB
NFS_Unstable: 0 kB NFS_Unstable: 0 kB NFS_Unstable: 0 kB NFS_Unstable: 0 kB
Bounce: 0 kB Bounce: 0 kB Bounce: 0 kB Bounce: 0 kB
WritebackTmp: 0 kB WritebackTmp: 0 kB WritebackTmp: 0 kB WritebackTmp: 0 kB
CommitLimit: 1965940 kB CommitLimit: 1965940 kB CommitLimit: 1965940 kB CommitLimit: 1965940 kB
Committed_AS: 1130516 kB Committed_AS: 79437584 kB Committed_AS: 43472636 kB Committed_AS: 1122240 kB
VmallocTotal: 34359738367 kB VmallocTotal: 34359738367 kB VmallocTotal: 34359738367 kB VmallocTotal: 34359738367 kB
VmallocUsed: 91504 kB VmallocUsed: 91504 kB VmallocUsed: 91504 kB VmallocUsed: 91504 kB
VmallocChunk: 34359582075 kB VmallocChunk: 34359582075 kB VmallocChunk: 34359582075 kB VmallocChunk: 34359582075 kB
HugePages_Total: 0 HugePages_Total: 0 HugePages_Total: 0 HugePages_Total: 0
HugePages_Free: 0 HugePages_Free: 0 HugePages_Free: 0 HugePages_Free: 0
HugePages_Rsvd: 0 HugePages_Rsvd: 0 HugePages_Rsvd: 0 HugePages_Rsvd: 0
HugePages_Surp: 0 HugePages_Surp: 0 HugePages_Surp: 0 HugePages_Surp: 0
Hugepagesize: 2048 kB Hugepagesize: 2048 kB Hugepagesize: 2048 kB Hugepagesize: 2048 kB
DirectMap4k: 6848 kB DirectMap4k: 6848 kB DirectMap4k: 6848 kB DirectMap4k: 6848 kB
DirectMap2M: 4120576 kB DirectMap2M: 4120576 kB DirectMap2M: 4120576 kB DirectMap2M: 4120576 kB


My kernel is 2.6.30.

Thanks,
Fengguang

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