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SubjectRe: scheduler went mad?

On Thu, 12 Apr 2001, Rik van Riel wrote:
> On Thu, 12 Apr 2001, Szabolcs Szakacsits wrote:
> > I still feel a bit unconfortable about processes looping forever in
> > __alloc_pages and because of this oom_killer also can't be moved to
> > page fault handler where I think its place should be. I'm using the
> > patch below.
> It's BROKEN. This means that if you have one task using up
> all memory and you're waiting for the OOM kill of that task
> to have effect, your syslogd, etc... will have their allocations
> fail and will die.

You mean without dropping out_of_memory() test in kswapd and calling
oom_kill() in page fault [i.e. without additional patch]? Yes, you're
competely true but I have the patch [see example below, 'm1' is the bad
guy] just didn't have time to extensively test it and don't know whether
there is side efffects getting rid of this infinite looping in
__alloc_pages() but locked up processes apparently don't make people
very happy ;)

Szaka

Out of Memory: Killed process 830 (m1), saved process 696 (httpd)
procs memory swap io system
r b w swpd free buff cache si so bi bo in cs
6 0 0 0 9492 100 1496 0 0 1386 2 2904 3877
5 0 0 0 7812 104 1788 0 0 289 0 689 22
5 0 0 0 6248 104 1788 0 0 0 0 108 19
5 0 0 0 4748 108 1840 0 0 56 0 219 21
5 0 0 0 3268 108 1868 0 0 28 0 165 23
5 0 1 0 1864 76 1868 0 0 0 5 120 61
5 0 1 0 1432 76 1252 0 0 0 0 108 1130
5 0 1 0 1236 80 796 0 0 65 0 246 4588
5 0 1 0 1236 80 668 0 0 0 0 110 8869
6 0 1 0 948 112 696 0 0 805 0 1814 8231
Out of Memory: Killed process 858 (m1), saved process 811 (vmstat)
5 0 1 0 924 152 444 0 0 1153 0 2731 18231
4 0 1 0 1720 148 828 0 0 750 3 1711 1876
5 0 1 0 1156 148 760 0 0 290 0 723 1967
4 0 1 0 1152 132 664 0 0 70 0 277 7249
4 0 1 0 1140 144 560 0 0 54 0 238 7942
4 0 1 0 1140 144 460 0 0 32 0 212 7521
Out of Memory: Killed process 834 (m1), saved process 418 (identd)

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