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: <20090115054903.GA30358@balbir.in.ibm.com>
Date:	Thu, 15 Jan 2009 11:19:04 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Li Zefan <lizf@...fujitsu.com>, Paul Menage <menage@...gle.com>
Subject: Re: [RFC][PATCH 5/4] memcg: don't call res_counter_uncharge when
	obsolete

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-01-15 14:14:58]:

> On Thu, 15 Jan 2009 13:38:14 +0900
> Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> 
> > On Thu, 15 Jan 2009 11:14:20 +0900, Daisuke Nishimura <nishimura@....nes.nec.co.jp> wrote:
> > > > > > To handle the problem "parent may be obsolete",
> > > > > > 
> > > > > > call mem_cgroup_get(parent) at create()
> > > > > > call mem_cgroup_put(parent) at freeing memcg.
> > > > > >      (regardless of use_hierarchy.)
> > > > > > 
> > > > > > is clearer way to go, I think.
> > > > > > 
> > > > > > I wonder whether there is  mis-accounting problem or not..
> > > > > > 
> > hmm, after more consideration, although this patch can prevent the BUG,
> > it can leak memsw accounting of parents because memsw of parents, which
> > have been incremented by charge, does not decremented.
> > 
> > I'll try pet/put parent approach..
> > Or any other good ideas ?
> > 
> > 
> I believe get/put at create/destroy is enough now..
> Let's try and see what happens.
>

Other approach could be get_hierarchical/put_hierarchical, but that
can quickly get complex. Let us try and avoid it, unless nothing else
works.
 
-- 
	Balbir
--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ