Re: [BUGFIX][PATCH 1/4] memcg: fix limit estimation at reclaim for hugepage

From: Minchan Kim
Date: Fri Jan 28 2011 - 03:04:22 EST

Hi Kame,

On Fri, Jan 28, 2011 at 1:58 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> How about this ?
> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Current memory cgroup's code tends to assume page_size == PAGE_SIZE
> and arrangement for THP is not enough yet.
> This is one of fixes for supporing THP. This adds
> mem_cgroup_check_margin() and checks whether there are required amount of
> free resource after memory reclaim. By this, THP page allocation
> can know whether it really succeeded or not and avoid infinite-loop
> and hangup.
> Total fixes for do_charge()/reclaim memory will follow this patch.

If this patch is only related to THP, I think patch order isn't good.
Before applying [2/4], huge page allocation will retry without
reclaiming and loop forever by below part.

@@ -1854,9 +1858,6 @@ static int __mem_cgroup_do_charge(struct
} else
mem_over_limit = mem_cgroup_from_res_counter(fail_res, res);

- if (csize > PAGE_SIZE) /* change csize and retry */
- return CHARGE_RETRY;
if (!(gfp_mask & __GFP_WAIT))

Am I missing something?

Kind regards,
Minchan Kim
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