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SubjectRe: [PATCH] mm: count only reclaimable lru pages
Date
> On Thu, 16 Jul 2009, David Howells wrote:
>
> > Rik van Riel <riel@redhat.com> wrote:
> >
> > > It's part of a series of patches, including the three posted by Kosaki-san
> > > last night (to track the number of isolated pages) and the patch I posted
> > > last night (to throttle reclaim when too many pages are isolated).
> >
> > Okay; Rik gave me a tarball of those patches, which I applied and re-ran the
> > test. The first run of msgctl11 produced lots of:
> >
> > [root@andromeda ltp]# while ./testcases/bin/msgctl11; do :; done
>
> I applied the series of patches on 2.6.31-rc3 and run
>
> while ./testcases/bin/msgctl11; do :; done
>
> four times, only got one OOM kill in the first round and the system is
> quite responsive all the time.
>
> # while ./testcases/bin/msgctl11; do :; done
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 0 WARN : Fork failure in first child of child group 1587
> msgctl11 0 WARN : Fork failure in first child of child group 1586
> ..snip...........
> msgctl11 1 FAIL : Child exit status = 4
>
> # while ./testcases/bin/msgctl11; do :; done
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 0 WARN : Fork failure in first child of child group 1573
> msgctl11 0 WARN : Fork failure in first child of child group 1524
> ...............snip.....
> msgctl11 1 FAIL : Child exit status = 4
>
> # while ./testcases/bin/msgctl11; do :; done
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 0 WARN : Fork failure in first child of child group 1050
> msgctl11 0 WARN : Fork failure in first child of child group 795
> msgctl11 1 FAIL : Child exit status = 4
>
> # while ./testcases/bin/msgctl11; do :; done
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16303 pids
> msgctl11 1 PASS : msgctl11 ran successfully!
> msgctl11 0 INFO : Using upto 16301 pids
> msgctl11 0 WARN : Fork failure in first child of child group 1346
> msgctl11 0 WARN : Fork failure in first child of child group 924
> ...........snip........
> msgctl11 1 FAIL : Child exit status = 4
>
>
> Vincent Li
> Biomedical Research Center
> University of British Columbia
>
> ---
> kernel: [ 735.507878] msgctl11 invoked oom-killer: gfp_mask=0x84d0, order=0, oom_adj=0

GFP_KERNEL | __GFP_REPEAT __GFP_ZERO


> kernel: [ 735.507884] msgctl11 cpuset=/ mems_allowed=0
> kernel: [ 735.507888] Pid: 20631, comm: msgctl11 Not tainted 2.6.31-rc3-custom #1
> kernel: [ 735.507891] Call Trace:
> kernel: [ 735.507900] [<c01ad781>] oom_kill_process+0x161/0x280
> kernel: [ 735.507905] [<c01adcd3>] ? select_bad_process+0x63/0xd0
> kernel: [ 735.507909] [<c01add8e>] __out_of_memory+0x4e/0xb0
> kernel: [ 735.507913] [<c01ade42>] out_of_memory+0x52/0xa0
> kernel: [ 735.507917] [<c01b0b07>] __alloc_pages_nodemask+0x4d7/0x4f0
> kernel: [ 735.507922] [<c01b0b77>] __get_free_pages+0x17/0x30
> kernel: [ 735.507927] [<c012baa6>] pgd_alloc+0x36/0x250
> kernel: [ 735.507932] [<c01f4ad3>] ? dup_fd+0x23/0x340
> kernel: [ 735.507936] [<c01422f7>] ? dup_mm+0x47/0x350
> kernel: [ 735.507939] [<c0141dd9>] mm_init+0xa9/0xe0
> kernel: [ 735.507943] [<c0142329>] dup_mm+0x79/0x350
> kernel: [ 735.507947] [<c01ffe22>] ? copy_fs_struct+0x22/0x90
> kernel: [ 735.507951] [<c01432d5>] ? copy_process+0xc75/0x1070
> kernel: [ 735.507955] [<c0143090>] copy_process+0xa30/0x1070
> kernel: [ 735.507959] [<c054b204>] ? schedule+0x494/0xa80
> kernel: [ 735.507963] [<c014373f>] do_fork+0x6f/0x330
> kernel: [ 735.507968] [<c014fdce>] ? recalc_sigpending+0xe/0x40
> kernel: [ 735.507972] [<c0107716>] sys_clone+0x36/0x40
> kernel: [ 735.507976] [<c0108dd4>] sysenter_do_call+0x12/0x28
> kernel: [ 735.507979] Mem-Info:
> kernel: [ 735.507981] DMA per-cpu:
> kernel: [ 735.507983] CPU 0: hi: 0, btch: 1 usd: 0
> kernel: [ 735.507986] CPU 1: hi: 0, btch: 1 usd: 0
> kernel: [ 735.507988] Normal per-cpu:
> kernel: [ 735.507990] CPU 0: hi: 186, btch: 31 usd: 17
> kernel: [ 735.507993] CPU 1: hi: 186, btch: 31 usd: 180
> kernel: [ 735.507994] HighMem per-cpu:
> kernel: [ 735.507997] CPU 0: hi: 42, btch: 7 usd: 22
> kernel: [ 735.507999] CPU 1: hi: 42, btch: 7 usd: 0
> kernel: [ 735.508008] active_anon:82389 inactive_anon:2043 isolated_anon:32
> kernel: [ 735.508009] active_file:2201 inactive_file:5773 isolated_file:31
> kernel: [ 735.508010] unevictable:0 dirty:4 writeback:0 unstable:0 buffer:19
> kernel: [ 735.508011] free:1825 slab_reclaimable:655 slab_unreclaimable:19679
> kernel: [ 735.508012] mapped:1309 shmem:113 pagetables:66757 bounce:0

a lot free pages. but...

> kernel: [ 735.508020] DMA free:3520kB min:64kB low:80kB high:96kB active_anon:2240kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15832kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:132kB kernel_stack:120kB pagetables:2436kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> kernel: [ 735.508026] lowmem_reserve[]: 0 867 998 998
> kernel: [ 735.508035] Normal free:3632kB min:3732kB low:4664kB high:5596kB active_anon:269136kB inactive_anon:0kB active_file:56kB inactive_file:20kB unevictable:0kB isolated(anon):128kB isolated(file):124kB present:887976kB mlocked:0kB dirty:0kB writeback:0kB mapped:4kB shmem:0kB slab_reclaimable:2620kB slab_unreclaimable:78584kB kernel_stack:77328kB pagetables:227972kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:222 all_unreclaimable? no
> kernel: [ 735.508042] lowmem_reserve[]: 0 0 1052 1052

DMA and Normal zone doesn't have enough free pages.

> kernel: [ 735.508051] HighMem free:148kB min:128kB low:268kB high:408kB active_anon:58180kB inactive_anon:8172kB active_file:8748kB inactive_file:23072kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:134688kB mlocked:0kB dirty:16kB writeback:0kB mapped:5232kB shmem:452kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:36620kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> kernel: [ 735.508057] lowmem_reserve[]: 0 0 0 0

HighMem zone only have enough free pages and reclaimable file cache pages.


> kernel: [ 735.508061] DMA: 8*4kB 2*8kB 2*16kB 2*32kB 1*64kB 0*128kB 1*256kB 2*512kB 0*1024kB 1*2048kB 0*4096kB = 3536kB
> kernel: [ 735.508073] Normal: 142*4kB 1*8kB 1*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3664kB
> kernel: [ 735.508084] HighMem: 2*4kB 10*8kB 2*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 120kB
> kernel: [ 735.508095] 8102 total pagecache pages
> kernel: [ 735.508097] 0 pages in swap cache
> kernel: [ 735.508099] Swap cache stats: add 0, delete 0, find 0/0
> kernel: [ 735.508101] Free swap = 0kB
> kernel: [ 735.508103] Total swap = 0kB
> kernel: [ 735.510778] 261775 pages RAM
> kernel: [ 735.510780] 33938 pages HighMem
> kernel: [ 735.510782] 21851 pages reserved
> kernel: [ 735.510784] 279954 pages shared
> kernel: [ 735.510786] 216034 pages non-shared
> kernel: [ 735.510789] Out of memory: kill process 14702 (msgctl11) score 96635 or a child
> kernel: [ 735.510793] Killed process 17847 (msgctl11)







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