From: Michal Hocko Date: Thu, 10 May 2018 09:18:25 +0200 Subject: [Cluster-devel] vmalloc with GFP_NOFS In-Reply-To: <20180510055825.GB32366@dhcp22.suse.cz> References: <20180424162712.GL17484@dhcp22.suse.cz> <20180424183536.GF30619@thunk.org> <20180424192542.GS17484@dhcp22.suse.cz> <20180509134222.GU32366@dhcp22.suse.cz> <20180509151351.GA4111@magnolia> <20180509210447.GX32366@dhcp22.suse.cz> <20180509220231.GD25312@magnolia> <20180510055825.GB32366@dhcp22.suse.cz> Message-ID: <20180510071825.GC32366@dhcp22.suse.cz> List-Id: To: cluster-devel.redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Thu 10-05-18 07:58:25, Michal Hocko wrote: > On Wed 09-05-18 15:02:31, Darrick J. Wong wrote: > > On Wed, May 09, 2018 at 11:04:47PM +0200, Michal Hocko wrote: > > > On Wed 09-05-18 08:13:51, Darrick J. Wong wrote: > [...] > > > > > FS resp. IO submitting code paths have to be careful when allocating > > > > > > > > Not sure what 'FS resp. IO' means here -- 'FS and IO' ? > > > > > > > > (Or is this one of those things where this looks like plain English text > > > > but in reality it's some sort of markup that I'm not so familiar with?) > > > > > > > > Confused because I've seen 'resp.' used as shorthand for > > > > 'responsible'... > > > > > > Well, I've tried to cover both. Filesystem and IO code paths which > > > allocate while in sensitive context. IO submission is kinda clear but I > > > am not sure what a general term for filsystem code paths would be. I > > > would be greatful for any hints here. > > > > "Code paths in the filesystem and IO stacks must be careful when > > allocating memory to prevent recursion deadlocks caused by direct memory > > reclaim calling back into the FS or IO paths and blocking on already > > held resources (e.g. locks)." ? > > Great, thanks! I dared to extend the last part to "(e.g. locks - most commonly those used for the transaction context)" -- Michal Hocko SUSE Labs