Hi,
Mem01 test case sometimes trigger OOM Killer,
# ./mem01
mem01 0 INFO : Free Mem: 952 Mb
mem01 0 INFO : Free Swap: 1971 Mb
mem01 0 INFO : Total Free: 2924 Mb
mem01 0 INFO : Total Tested: 2924 Mb
mem01 0 INFO : touching 2924MB of malloc'ed memory (linear)
Killed
automount invoked oom-killer: gfp_mask=0x201d2, order=0, oomkilladj=0
Call Trace:
[<ffffffff800c394f>] out_of_memory+0x8e/0x2f5
[<ffffffff8000f2f0>] __alloc_pages+0x245/0x2ce
[<ffffffff80012bf5>] __do_page_cache_readahead+0x95/0x1d9
[<ffffffff80063a04>] __wait_on_bit_lock+0x5b/0x66
[<ffffffff880fbd4d>] :dm_mod:dm_any_congested+0x38/0x3f
[<ffffffff80013594>] filemap_nopage+0x148/0x322
[<ffffffff80008863>] __handle_mm_fault+0x1f8/0xe5c
[<ffffffff80066b9a>] do_page_fault+0x4cb/0x830
[<ffffffff80030eea>] do_fork+0x145/0x1be
[<ffffffff8005dde9>] error_exit+0x0/0x84
Node 0 DMA per-cpu:
cpu 0 hot: high 0, batch 1 used:0
cpu 0 cold: high 0, batch 1 used:0
cpu 1 hot: high 0, batch 1 used:0
cpu 1 cold: high 0, batch 1 used:0
Node 0 DMA32 per-cpu:
cpu 0 hot: high 186, batch 31 used:34
cpu 0 cold: high 62, batch 15 used:53
cpu 1 hot: high 186, batch 31 used:17
cpu 1 cold: high 62, batch 15 used:30
Node 0 Normal per-cpu: empty
Node 0 HighMem per-cpu: empty
Free pages: 6084kB (0kB HighMem)
Active:127104 inactive:116973 dirty:0 writeback:0 unstable:0 free:1521
slab:4974 mapped-file:947 mapped-anon:243109 pagetables:2182
Node 0 DMA free:2128kB min:40kB low:48kB high:60kB active:0kB inactive:0kB
present:10724kB pages_scanned:0 all_unreclaimable? yes
lowmem_reserve[]: 0 993 993 993
Node 0 DMA32 free:3956kB min:4012kB low:5012kB high:6016kB active:508416kB
inactive:467764kB present:1017832kB pages_scanned:6950044 all_unreclaimable? yes
lowmem_reserve[]: 0 0 0 0
Node 0 Normal free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB
present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
Node 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB
present:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 4*4kB 4*8kB 2*16kB 4*32kB 4*64kB 1*128kB 2*256kB 0*512kB 1*1024kB
0*2048kB 0*4096kB = 2128kB
Node 0 DMA32: 1*4kB 0*8kB 3*16kB 2*32kB 0*64kB 0*128kB 1*256kB 1*512kB 1*1024kB
1*2048kB 0*4096kB = 3956kB
Node 0 Normal: empty
Node 0 HighMem: empty
1275 pagecache pages
Swap cache: add 5848546, delete 5848271, find 244250/247093, race 1+1
Free swap = 0kB
Total swap = 2064376kB
Out of memory: Killed process 31159 (mem01).
As the result, the test failed with a non-error code. This patch
reduces the chance of OOM Killer by always reserving 16MB memory. It
is a trade-off between not testing all available memory and dealing
with false failure (extra work to waive the failure in automated
environment and clean up unexpected test leftovers). I prefer the
formal.
Signed-off-by: CAI Qian <[EMAIL PROTECTED]>
--- testcases/kernel/mem/mem/mem01.c.orig 2008-12-11 18:50:46.113160106
+0800
+++ testcases/kernel/mem/mem/mem01.c 2008-12-11 18:53:53.723135288 +0800
@@ -228,6 +228,8 @@
res = (unsigned long long)3*1024*1024*1024;
#endif
+ /* Always reserve 16MB memory to avoid OOM Killer.*/
+ res -= 16*1024*1024;
tst_resm(TINFO, "Total Tested:\t%llu Mb", res/1024/1024);
return (size_t)res;
}
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