Joe Thornber eb76faf53b
dm bufio: update last_accessed when relinking a buffer ...
The 'last_accessed' member of the dm_buffer structure was only set when
the the buffer was created. This led to each buffer being discarded
after dm_bufio_max_age time even if it was used recently. In practice
this resulted in all thinp metadata being evicted soon after being read
-- this is particularly problematic for metadata intensive workloads
like multithreaded small random IO.
'last_accessed' is now updated each time the buffer is moved to the head
of the LRU list, so the buffer is now properly discarded if it was not
used in dm_bufio_max_age time.
Signed-off-by: Joe Thornber <ejt@redhat.com >
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com >
Signed-off-by: Mike Snitzer <snitzer@redhat.com >
Cc: stable@vger.kernel.org # v3.2+
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eb76faf53b