Re: [PATCH] mm: disallow direct reclaim page writeback

[KAMEZAWA Hiroyuki]

On Fri, 16 Apr 2010 10:13:39 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
 
> Hmm. Then, if memoy cgroup is filled by dirty pages, it can't kick writeback
> and has to wait for someone else's writeback ?
> 
> How long this will take ?
> # mount -t cgroup none /cgroup -o memory
> # mkdir /cgroup/A
> # echo 20M > /cgroup/A/memory.limit_in_bytes
> # echo $$ > /cgroup/A/tasks
> # dd if=/dev/zero of=./tmpfile bs=4096 count=1000000
> 
> Can memcg ask writeback thread to "Wake Up Now! and Write this out!" effectively ?
> 

Hmm.. I saw an oom-kill while testing several cases but performance itself
seems not to be far different with or without patch.
But I'm unhappy with oom-kill, so some tweak for memcg will be necessary
if we'll go with this.

Thanks,
-Kame

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