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SubjectRe: [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim
On 06/15/2010 08:17 PM, KAMEZAWA Hiroyuki wrote:
> On Tue, 15 Jun 2010 15:16:01 +0100
> Mel Gorman<mel@csn.ul.ie> wrote:

>> But in turn, where is mem_cgroup_hierarchical_reclaim called from direct
>> reclaim? It appears to be only called from the fault path or as a result
>> of the memcg changing size.
>>
> yes. It's only called from
> - page fault
> - add_to_page_cache()
>
> I think we'll see no stack problem. Now, memcg doesn't wakeup kswapd for
> reclaiming memory, it needs direct writeback.

Of course, a memcg page fault could still be triggered
from copy_to_user or copy_from_user, with a fairly
arbitrary stack frame above...

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