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<redacted>

Reviewed-by: Rik van Riel <redacted>

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