[PATCH v3 5/5] ext4: Defer mmap cmtime update until writeback

[Dave Chinner]

On Fri, Aug 16, 2013 at 04:22:12PM -0700, Andy Lutomirski wrote:
> A fancier implementation could probably avoid an extra journal
> transaction by adding a mapping_test_clear_cmtime call in
> ext4_writepages, but this should already be a considerable
> improvement -- we'll start one transaction per writepages call
> instead of one per page.

I'd like to see more than just an ext4 implementation - btrfs and
XFS are the other main filesystems that should behave identically.

Also, it's worthwhile to write a generic xfstest to ensure that they
all update the timestamp appropriately - if its' in xfstests, then
we can basically guarantee that it won't get randomly regressed in
future, and other filesystems can be easily verified as well sa
their implement this.

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com