On Sun 01-05-11 15:06:02, KOSAKI Motohiro wrote:

quoted

On Mon 25-04-11 18:28:49, KAMEZAWA Hiroyuki wrote:

quoted

There are two watermarks added per-memcg including "high_wmark" and "low_wmark".
The per-memcg kswapd is invoked when the memcg's memory usage(usage_in_bytes)
is higher than the low_wmark. Then the kswapd thread starts to reclaim pages
until the usage is lower than the high_wmark.

I have mentioned this during Ying's patchsets already, but do we really
want to have this confusing naming? High and low watermarks have
opposite semantic for zones.

Can you please clarify this? I feel it is not opposite semantics.

In the global reclaim low watermark represents the point when we _start_
background reclaim while high watermark is the _stopper_. Watermarks are
based on the free memory while this proposal makes it based on the used
memory.
I understand that the result is same in the end but it is really
confusing because you have to switch your mindset from free to used and
from under the limit to above the limit.
-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic

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