Messages in this thread | | | Date | Wed, 20 Oct 2010 23:35:15 +0900 | From | Minchan Kim <> | Subject | Re: [PATCH v2][memcg+dirtylimit] Fix overwriting global vm dirty limit setting by memcg (Re: [PATCH v3 00/11] memcg: per cgroup dirty page accounting |
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On Wed, Oct 20, 2010 at 02:02:55PM +0900, KAMEZAWA Hiroyuki wrote: > Fixed one here. > == > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > Now, at calculating dirty limit, vm_dirty_param() is called. > This function returns dirty-limit related parameters considering > memory cgroup settings. > > Now, assume that vm_dirty_bytes=100M (global dirty limit) and > memory cgroup has 1G of pages and 40 dirty_ratio, dirtyable memory is > 500MB. > > In this case, global_dirty_limits will consider dirty_limt as > 500 *0.4 = 200MB. This is bad...memory cgroup is not back door. > > This patch limits the return value of vm_dirty_param() considring > global settings. > > Changelog: > - fixed an argument "mem" int to u64 > - fixed to use global available memory to cap memcg's value. > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
It should have written this on Documentation. "memcg dirty limit can't exceed global dirty limit"
-- Kind regards, Minchan Kim
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