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memcg: page cgroup diet

From:  KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To:  "linux-mm@kvack.org" <linux-mm@kvack.org>
Subject:  [PATCH 0/6 v4] memcg: page cgroup diet
Date:  Tue, 14 Feb 2012 12:04:14 +0900
Message-ID:  <20120214120414.025625c2.kamezawa.hiroyu@jp.fujitsu.com>
Cc:  "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "hannes@cmpxchg.org" <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, "akpm@linux-foundation.org" <akpm@linux-foundation.org>, Ying Han <yinghan@google.com>, Hugh Dickins <hughd@google.com>
Archive-link:  Article


Here is v4. I removed RFC and fixed a fatal bug in v3.

This patch series is a preparetion for removing page_cgroup->flags. To remove
it, we need to reduce flags on page_cgroup. In this set, PCG_MOVE_LOCK and
PCG_FILE_MAPPED are remvoed.

After this, we only have 3 bits.
==
enum {
        /* flags for mem_cgroup */
        PCG_LOCK,  /* Lock for pc->mem_cgroup and following bits. */
        PCG_USED, /* this object is in use. */
        PCG_MIGRATION, /* under page migration */
        __NR_PCG_FLAGS,
};
==

I'll make a try to merge this 3bits to lower 3bits of pointer to
memcg. Then, we can make page_cgroup 8(4)bytes per page.


Major changes since v3 are
 - replaced move_lock_page_cgroup() with move_lock_mem_cgroup().
   passes pointer to memcg rather than page_cgroup.

Working on linux-next feb13 and passed several tests.

Thanks,
-Kame

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