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
| ||
|
Message-ID: <20150924204806.GH25415@mtj.duckdns.org> Date: Thu, 24 Sep 2015 16:48:06 -0400 From: Tejun Heo <tj@...nel.org> To: Artem Bityutskiy <dedekind1@...il.com> Cc: Theodore Ts'o <tytso@....edu>, axboe@...nel.dk, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, lizefan@...wei.com, cgroups@...r.kernel.org, hannes@...xchg.org, kernel-team@...com, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org, Dexuan Cui <decui@...rosoft.com> Subject: Re: [PATCH cgroup/for-4.3-fixes] cgroup, writeback: don't enable cgroup writeback on traditional hierarchies On Wed, Sep 23, 2015 at 05:07:29PM -0400, Tejun Heo wrote: > inode_cgwb_enabled() gates cgroup writeback support. If it returns > true, each inode is attached to the corresponding memory domain which > gets mapped to io domain. It currently only tests whether the > filesystem and bdi support cgroup writeback; however, cgroup writeback > support doesn't work on traditional hierarchies and thus it should > also test whether memcg and iocg are on the default hierarchy. > > This caused traditional hierarchy setups to hit the cgroup writeback > path inadvertently and ended up creating separate writeback domains > for each memcg and mapping them all to the root iocg uncovering a > couple issues in the cgroup writeback path. > > cgroup writeback was never meant to be enabled on traditional > hierarchies. Make inode_cgwb_enabled() test whether both memcg and > iocg are on the default hierarchy. > > Signed-off-by: Tejun Heo <tj@...nel.org> > Reported-by: Artem Bityutskiy <dedekind1@...il.com> > Reported-by: Dexuan Cui <decui@...rosoft.com> > Link: http://lkml.kernel.org/g/1443012552.19983.209.camel@gmail.com > Link: http://lkml.kernel.org/g/f30d4a6aa8a546ff88f73021d026a453@SIXPR30MB031.064d.mgd.msft.net Applying to cgroup/for-4.3-fixes. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" 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