linux-kernel - Re: [RFC][PATCH 1/6] memcg: free all at rmdir

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: <20081113122241.b77a0d14.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 13 Nov 2008 12:22:41 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, nishimura@....nes.nec.co.jp,
	Paul Menage <menage@...gle.com>
Subject: Re: [RFC][PATCH 1/6] memcg: free all at rmdir

On Thu, 13 Nov 2008 08:44:59 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Wed, 12 Nov 2008 16:07:58 -0800
> > Andrew Morton <akpm@...ux-foundation.org> wrote:
> >> If we do this then we can make the above "keep" behaviour non-optional,
> >> and the operator gets to choose whether or not to drop the caches
> >> before doing the rmdir.
> >>
> >> Plus, we get a new per-memcg drop_caches capability.  And it's a nicer
> >> interface, and it doesn't have the obvious races which on_rmdir has,
> >> etc.
> >>
> >> hm?
> >>
> > 
> > Balbir, how would you want to do ?
> > 
> > I planned to post shrink_uage patch later (it's easy to be implemented) regardless
> > of acceptance of this patch.
> > 
> > So, I think we should add shrink_usage now and drop this is a way to go.
> 
> I am a bit concerned about dropping stuff at will later. Ubuntu 8.10 has memory
> controller enabled and we exposed memory.force_empty interface there and now
> we've dropped it (bad on our part). I think we should have deprecated it and
> dropped it later.
> 
I *was* documented as "for debug only".

Hmm, adding force_empty again to do "shrink usage to 0" is another choice.

ok?

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/