On Wed, Jun 08, 2011 at 09:15:46PM -0400, Rik van Riel wrote:

On 06/02/2011 08:59 AM, Hiroyuki Kamezawa wrote:

quoted

It seems your current series is a mixture of 2 works as
"re-desgin of softlimit" and "removal of global LRU".
I don't understand why you need 2 works at once.

That seems pretty obvious.

With the global LRU gone, the only way to reclaim
pages in a global fashion (because the zone is low
on memory), is to reclaim from all the memcgs in
the zone.

That is correct.

Doing that requires that the softlimit stuff is
changed, and not only the biggest offender is
attacked.

I think it's much more natural to do it that way, but it's not a
requirement as such.  We could just keep the extra soft limit reclaim
invocation in kswapd that looks for the biggest offender and the
hierarchy below it, then does a direct call to do_shrink_zone() to
bypass the generic hierarchy walk.

It's not very nice to have that kind of code duplication, but it's
possible to leave it like that for now.

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