Re: [POC][PATCH] xfs: reduce ilock contention on buffered randrw workload

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On Mon, Apr 08, 2019 at 09:37:09AM -0700, Davidlohr Bueso wrote:
> On Mon, 2019-04-08 at 12:33 +0200, Jan Kara wrote:
> > On Fri 05-04-19 08:17:30, Dave Chinner wrote:
> > > FYI, I'm working on a range lock implementation that should both
> > > solve the performance issue and the reader starvation issue at the
> > > same time by allowing concurrent buffered reads and writes to
> > > different file ranges.
> > 
> > Are you aware of range locks Davidlohr has implemented [1]? It didn't get
> > merged because he had no in-tree user at the time (he was more aiming at
> > converting mmap_sem which is rather difficult). But the generic lock
> > implementation should be well usable.
> > 
> > Added Davidlohr to CC.
> > 
> > 								Honza
> > 
> > [1] https://lkml.org/lkml/2017/3/7/22
> 
> fyi this was the latest version (had some naming updates per peterz).
> 
> https://lkml.org/lkml/2018/2/4/232

No, I wasn't aware of these because they haven't ever been posted to
a list I subscribe to and they haven't been merged. I'll go have a
look at them over the next few days.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx



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