Re: [PATCH] RFC: vmscan: add min_filelist_kbytes sysctl for protectingthe working set

From: Rik van Riel
Date: Wed Nov 03 2010 - 07:42:33 EST


On 11/02/2010 11:03 PM, Minchan Kim wrote:

It could.
But time based approach would be same, IMHO.
First of all, I don't want long latency of direct reclaim process.
It could affect response of foreground process directly.

If VM limits the number of pages reclaimed per second, direct reclaim
process's latency will be affected. so we should avoid throttling in
direct reclaim path. Agree?

The idea would be to not throttle the processes trying to
reclaim page cache pages, but to only reclaim anonymous
pages when the page cache pages are low (and occasionally
a few page cache pages, say 128 a second).

If too many reclaimers come in when the page cache is
low and no swap is available, we will OOM kill instead
of stalling.

After all, the entire point of this patch would be to
avoid minutes-long latencies in triggering the OOM
killer.

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