[PATCH] [RFC] xfs: byte range buffer dirty region tracking

[Mark Tinguely]

On 02/23/14 16:25, Dave Chinner wrote:
> From: Dave Chinner<dchinner at redhat.com>
> Switching this to just track the first and last modified bytes in
> the block and only converting that to a dirty bitmap in the buffer
> log item at format time, however, gets rid of most of this dirty
> bitmap overhead without increasing memcpy time  at all. the result
> is that peformance on a 64k directory block size increases to
> roughly 16,000 files/s with memcpy() overhead only slightly
> increasing.

Looks interesting. 4 regions seems reasonable to me.


--Mark.