Messages in this thread Patch in this message | | | Date | Tue, 27 Dec 2011 21:33:04 +0800 | Subject | Re: Kswapd in 3.2.0-rc5 is a CPU hog | From | Hillf Danton <> |
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On Tue, Dec 27, 2011 at 8:20 AM, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote: > On Mon, 26 Dec 2011 20:35:46 +0800 > Hillf Danton <dhillf@gmail.com> wrote: > >> On Sun, Dec 25, 2011 at 6:21 PM, Nikolay S. <nowhere@hakkenden.ath.cx> wrote: >> > >> > Uhm.., is this patch against 3.2-rc4? I can not apply it. There's no >> > mem_cgroup_lru_del_list(), but void mem_cgroup_del_lru_list(). Should I >> > place changes there? >> > >> > And also, -rc7 is here. May the problem be addressed as part of some >> > ongoing work? Is there any reason to try -rc7 (the problem requires >> > several days of uptime to become obvious)? >> > >> >> Sorry, Nikolay, it is not based on the -next, nor on the -rc5(I assumed it was). >> The following is based on -next, and if you want to test -rc5, please >> grep MEM_CGROUP_ZSTAT mm/memcontrol.c and change it. >> >> Best regard >> > > Hmm ? memcg is used ? Why do you consider this will be a help ? >
Hi Kame
Please see the livelock at https://lkml.org/lkml/2011/12/23/222
and if it is related to the hog here, please check if the following is in right direction.
Thanks Hillf ---
--- a/mm/memcontrol.c Mon Dec 26 20:34:38 2011 +++ b/mm/memcontrol.c Tue Dec 27 20:05:12 2011 @@ -3637,6 +3637,7 @@ static int mem_cgroup_force_empty_list(s list = &mz->lruvec.lists[lru];
loop = MEM_CGROUP_ZSTAT(mz, lru); + WARN_ON((long)loop < 0); /* give some margin against EBUSY etc...*/ loop += 256; busy = NULL;
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