Re: [PATCH V2 0/5] memcg softlimit reclaim rework

[Hillf Danton <dhillf@gmail.com>]

On Thu, Apr 12, 2012 at 5:56 AM, Ying Han <yinghan@google.com> wrote:
> The "soft_limit" was introduced in memcg to support over-committing the
> memory resource on the host. Each cgroup configures its "hard_limit" where
> it will be throttled or OOM killed by going over the limit. However, the
> cgroup can go above the "soft_limit" as long as there is no system-wide
> memory contention. So, the "soft_limit" is the kernel mechanism for
> re-distributng system spare memory among cgroups.
>
s/re-distributng/re-distributing/

> This patch reworks the softlimit reclaim by hooking it into the new global
> reclaim scheme. So the global reclaim path including direct reclaim and
> background reclaim will respect the memcg softlimit.
>
> Note:
> 1. the new implementation of softlimit reclaim is rather simple and first
> step for further optimizations. there is no memory pressure balancing between
> memcgs for each zone, and that is something we would like to add as follow-ups.
>
> 2. this patch is slightly different from the last one posted from Johannes,
>
For those who want to see posts by Johannes, add links please.

> where his patch is closer to the reverted implementation by doing hierarchical
> reclaim for each selected memcg. However, that is not expected behavior from
> user perspective. Considering the following example:
>

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>