Re: [PATCH 0/11] introduce down_write_killable for rw_semaphore

From: Michal Hocko
Date: Thu Mar 31 2016 - 04:59:41 EST

On Wed 30-03-16 15:32:17, Peter Zijlstra wrote:
> On Mon, Feb 29, 2016 at 01:58:14PM +0100, Michal Hocko wrote:
> > I have tested on x86 with OOM situations with high mmap_sem contention
> > (basically many parallel page faults racing with many parallel mmap/munmap
> > tight loops) so the waiters for the write locks are routinely interrupted
> > by SIGKILL.
> Aside from the one niggle (as per the other email) they look good to me
> and I would take them through the tip/locking tree.

Thanks for the review! I understand that tip/locking would be the most
appropriate place but I am wondering whether this causes some issues
with the follow up patches which use this new API and which I expect to
go via Andrew's tree.

That being said I do not care much but then we have a potential
dependency between mmotm and tip/locking.

Michal Hocko