Messages in this thread | | | Date | Mon, 05 Mar 2012 08:49:20 -0500 | From | Rik van Riel <> | Subject | Re: [RFC][PATCH] avoid swapping out with swappiness==0 |
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On 03/02/2012 12:36 PM, Satoru Moriya wrote: > Sometimes we'd like to avoid swapping out anonymous memory > in particular, avoid swapping out pages of important process or > process groups while there is a reasonable amount of pagecache > on RAM so that we can satisfy our customers' requirements. > > OTOH, we can control how aggressive the kernel will swap memory pages > with /proc/sys/vm/swappiness for global and > /sys/fs/cgroup/memory/memory.swappiness for each memcg. > > But with current reclaim implementation, the kernel may swap out > even if we set swappiness==0 and there is pagecache on RAM. > > This patch changes the behavior with swappiness==0. If we set > swappiness==0, the kernel does not swap out completely > (for global reclaim until the amount of free pages and filebacked > pages in a zone has been reduced to something very very small > (nr_free + nr_filebacked< high watermark)). > > Any comments are welcome.
My mind is now rested by doing a nice 10 mile hike :)
> Signed-off-by: Satoru Moriya<satoru.moriya@hds.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
-- All rights reversed
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