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Date: Fri, 22 Nov 2019 16:53:32 +1100 From: Matthew Bobrowski <mbobrowski@...browski.org> To: Ritesh Harjani <riteshh@...ux.ibm.com> Cc: jack@...e.cz, tytso@....edu, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org Subject: Re: [RFCv3 1/4] ext4: fix ext4_dax_read/write inode locking sequence for IOCB_NOWAIT On Wed, Nov 20, 2019 at 10:30:21AM +0530, Ritesh Harjani wrote: > Apparently our current rwsem code doesn't like doing the trylock, then > lock for real scheme. So change our dax read/write methods to just do the > trylock for the RWF_NOWAIT case. > This seems to fix AIM7 regression in some scalable filesystems upto ~25% > in some cases. Claimed in commit 942491c9e6d6 ("xfs: fix AIM7 regression") > > Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com> This looks OK to me. Feel free to add: Reviewed-by: Matthew Bobrowski <mbobrowski@...browski.org> /M
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