bcache: allow quick writeback when backing idle

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If the control system would wait for at least half a second, and there's
been no reqs hitting the backing disk for awhile: use an alternate mode
where we have at most one contiguous set of writebacks in flight at a
time. (But don't otherwise delay).  If front-end IO appears, it will
still be quick, as it will only have to contend with one real operation
in flight.  But otherwise, we'll be sending data to the backing disk as
quickly as it can accept it (with one op at a time).

Signed-off-by: Michael Lyle <mlyle@lyle.org>
Reviewed-by: Tang Junhui <tang.junhui@zte.com.cn>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

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Michael Lyle 2018-01-08 12:21:24 -08:00 • committed by Jens Axboe

parent 6e6ccc67b9

commit b1092c9af9

3 changed files with 29 additions and 0 deletions

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7

drivers/md/bcache/bcache.h

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1

drivers/md/bcache/request.c

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21

drivers/md/bcache/writeback.c

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