Re: [PATCH] temporarily disable swap token on memory pressure

[Zwane Mwaikambo <zwane@arm.linux.org.uk>]

On Fri, 25 Nov 2005, Rik van Riel wrote:

> Some users (hi Zwane) have seen a problem when running a workload
> that eats nearly all of physical memory - th system does an OOM
> kill, even when there is still a lot of swap free.
> 
> I suspect the problem is that that big task is holding the swap
> token, and the VM has a very hard time finding any other page in
> the system that is swappable.  
> 
> Instead of ignoring the swap token when sc->priority reaches 0,
> we could simply take the swap token away from the memory hog and
> make sure we don't give it back to the memory hog for a few seconds.
> 
> This patch is untested, since I have not reproduced Zwane's problem
> on my system.  I would like to see test results from anybody who is
> running into this problem.
> 
> This patch is against today's git head.

Very nice! With this patch my job actually completed.

MemTotal:      2049180 kB
MemFree:         15592 kB
Buffers:          1516 kB
Cached:          62972 kB
SwapCached:     190512 kB
Active:        1626228 kB
Inactive:       361288 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2049180 kB
LowFree:         15592 kB
SwapTotal:     3228760 kB
SwapFree:      2555688 kB
Dirty:               0 kB
Writeback:           0 kB
Mapped:        1824108 kB
Slab:            27392 kB
CommitLimit:   4253348 kB
Committed_AS:  2472188 kB
PageTables:       6688 kB
VmallocTotal: 34359738367 kB
VmallocUsed:    263796 kB
VmallocChunk: 34359474119 kB

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