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    SubjectRe: [RFC][PATCH] avoid swapping out with swappiness==0
    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<>

    Reviewed-by: Rik van Riel <>

    All rights reversed

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      Last update: 2012-03-05 14:53    [W:0.021 / U:14.252 seconds]
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