Re: [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim

From: Rik van Riel
Date: Tue Jun 15 2010 - 20:32:35 EST

On 06/15/2010 08:17 PM, KAMEZAWA Hiroyuki wrote:
On Tue, 15 Jun 2010 15:16:01 +0100
Mel Gorman<mel@xxxxxxxxx> 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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