linux-kernel - [RFC][PATCH -mm 0/7] memcg: lockless page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20080820185306.e897c512.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 20 Aug 2008 18:53:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	ryov@...inux.co.jp, "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: [RFC][PATCH -mm 0/7] memcg: lockless page_cgroup v1

Hi, this is a patch set for lockless page_cgroup.

dropped patches related to mem+swap controller for easy review.
(I'm rewriting it, too.)

Changes from current -mm is.
  - page_cgroup->flags operations is set to be atomic.
  - lock_page_cgroup() is removed.
  - page->page_cgroup is changed from unsigned long to struct page_cgroup*
  - page_cgroup is freed by RCU.
  - For avoiding race, charge/uncharge against mm/memory.c::insert_page() is
    omitted. This is ususally used for mapping device's page. (I think...)

In my quick test, perfomance is improved a little. But the benefit of this
patch is to allow access page_cgroup without lock. I think this is good 
for Yamamoto's Dirty page tracking for memcg.
For I/O tracking people, I added a header file for allowing access to
page_cgroup from out of memcontrol.c

The base kernel is recent mmtom. Any comments are welcome.
This is still under test. I have to do long-run test before removing "RFC".

patch [1-4] is core logic.

[1/7] page_cgroup_atomic_flags.patch
[2/7] delayed_batch_freeing_of_page_cgroup.patch
[3/7] freeing page_cgroup by rcu.patch
[4/7] lockess page_cgroup.patch
[5/7] add prefetch patch
[6/7] make-mapping-null-before-calling-uncharge.patch
[7/7] adding page_cgroup.h header file.patch


Thanks,
-Kame

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/