lkml.org 
[lkml]   [2010]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH 1/7] memcg: sc.nr_to_reclaim should be initialized
Date
> >> 1. How far does this push pages (in terms of when limit is hit)?
> >
> > 32 pages per mem_cgroup_shrink_node_zone().
> >
> > That said, the algorithm is here.
> >
> > 1. call mem_cgroup_largest_soft_limit_node()
> >   calculate largest cgroup
> > 2. call mem_cgroup_shrink_node_zone() and shrink 32 pages
> > 3. goto 1 if limit is still exceed.
> >
> > If it's not your intention, can you please your intended algorithm?
>
> We set it to 0, since we care only about a single page reclaim on
> hitting the limit. IIRC, in the past we saw an excessive pushback on
> reclaiming SWAP_CLUSTER_MAX pages, just wanted to check if you are
> seeing the same behaviour even now after your changes.

Actually, we have 32 pages reclaim batch size. (see nr_scan_try_batch() and related functions)
thus <32 value doesn't works as your intended.

But, If you run your test again, and (if there is) report any bugs. I'm very glad and fix it soon.

Thanks.



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2010-07-25 11:51    [W:0.186 / U:0.564 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site