Re: vmalloc with GFP_NOFS

[Michal Hocko]

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