dm cache: defer whole cells

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Currently individual bios are deferred to the worker thread if they
cannot be processed immediately (eg, a block is in the process of
being moved to the fast device).

This patch passes whole cells across to the worker.  This saves
reaquiring the cell, and also collects bios destined for the same block
together, which allows them to be mapped with a single look up to the
policy.  This reduces the overhead of using dm-cache.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Joe Thornber 2015-05-15 15:26:08 +01:00 • committed by Mike Snitzer

parent 3cdf93f9d8

commit 651f5fa2a3

1 changed files with 262 additions and 63 deletions

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325

drivers/md/dm-cache-target.c

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