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
| ||
|
Date: Sat, 24 Sep 2011 10:33:46 -0300 From: Glauber Costa <glommer@...allels.com> To: Balbir Singh <bsingharora@...il.com> CC: Greg Thelen <gthelen@...gle.com>, <linux-kernel@...r.kernel.org>, <paul@...lmenage.org>, <lizf@...fujitsu.com>, <kamezawa.hiroyu@...fujitsu.com>, <ebiederm@...ssion.com>, <davem@...emloft.net>, <netdev@...r.kernel.org>, <linux-mm@...ck.org>, <kirill@...temov.name> Subject: Re: [PATCH v3 2/7] socket: initial cgroup code. On 09/22/2011 12:09 PM, Balbir Singh wrote: > On Thu, Sep 22, 2011 at 11:30 AM, Greg Thelen<gthelen@...gle.com> wrote: >> On Wed, Sep 21, 2011 at 11:59 AM, Glauber Costa<glommer@...allels.com> wrote: >>> Right now I am working under the assumption that tasks are long lived inside >>> the cgroup. Migration potentially introduces some nasty locking problems in >>> the mem_schedule path. >>> >>> Also, unless I am missing something, the memcg already has the policy of >>> not carrying charges around, probably because of this very same complexity. >>> >>> True that at least it won't EBUSY you... But I think this is at least a way >>> to guarantee that the cgroup under our nose won't disappear in the middle of >>> our allocations. >> >> Here's the memcg user page behavior using the same pattern: >> >> 1. user page P is allocate by task T in memcg M1 >> 2. T is moved to memcg M2. The P charge is left behind still charged >> to M1 if memory.move_charge_at_immigrate=0; or the charge is moved to >> M2 if memory.move_charge_at_immigrate=1. >> 3. rmdir M1 will try to reclaim P (if P was left in M1). If unable to >> reclaim, then P is recharged to parent(M1). >> > > We also have some magic in page_referenced() to remove pages > referenced from different containers. What we do is try not to > penalize a cgroup if another cgroup is referencing this page and the > page under consideration is being reclaimed from the cgroup that > touched it. > > Balbir Singh humm... Then we need to keep pointers to: 1) Which allocations comes from each socket, and 2) Which sockets comes from each task. 2 is pretty easy, 1 may get expensive. I will investigate it now. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists