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Subjectout_of_memory() heuristic broken for different mem configurations


Hi people,

While testing 2.4.14 VM on the 16GB machine testbox I've been able to
make the OOM killer not trigger correctly. The same usual workload: lots
of fillmem processes.

Looking at out_of_memory() I've found out that we will only kill a task if
we happen to call out_of_memory() ten times in one second.

That is completly variable on the system load: Taking into account that we
have we lots of processes inside try_to_free_pages() and the LRU list is
insanely HUGE (almost all pages were on the inactive list), I think this
"ten times in one second" just does not work.

Well, yes, its seems to be just a wrong magic number for this
setup/workload.

Linus, any suggestion to "fix" that ?

/proc tunable (eeek) ?


vmstat output:

13 7 2 3812816 2884 228 7648 42 28454 58 28430 295 1070 0 70 30
10 12 2 3880664 2640 204 7644 24 27754 28 27766 277 14650 0 92 8
17 5 1 3943404 2964 228 7656 22 31258 38 31276 303 10067 0 80 20
18 3 1 3998948 2708 220 7652 32 19434 46 19422 224 857 0 83 17

(end of swap)

23 1 1 4032960 2892 232 7648 16 24246 22 24252 235 997 0 72 28
22 1 1 4032960 2872 232 7648 0 0 0 0 106 13 0 99 0
23 0 2 4032960 2764 232 7648 0 0 0 0 116 11 0 100 0
21 0 1 4032960 2856 232 7648 0 0 0 0 122 45 0 100 0
21 0 1 4032960 2848 232 7648 0 0 0 0 117 21 0 100 0
21 0 1 4032960 2588 232 7648 38 0 38 0 118 41 0 100 0
21 0 1 4032960 2584 232 7648 0 0 0 0 123 10 0 100 0


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