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Commit c2f6805d authored by Vivek Goyal's avatar Vivek Goyal Committed by Jens Axboe
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blk-throttle: Fix calculation of max number of WRITES to be dispatched 



o Currently we try to dispatch more READS and less WRITES (75%, 25%) in one
  dispatch round. ummy pointed out that there is a bug in max_nr_writes
  calculation. This patch fixes it.

Reported-by: default avatarummy y <yummylln@yahoo.com.cn>
Signed-off-by: default avatarVivek Goyal <vgoyal@redhat.com>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent d69b78ba

block/blk-throttle.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -645,7 +645,7 @@ static int throtl_dispatch_tg(struct throtl_data *td, struct throtl_grp *tg, 
{

{

	unsigned int nr_reads = 0, nr_writes = 0;

	unsigned int nr_reads = 0, nr_writes = 0;

	unsigned int max_nr_reads = throtl_grp_quantum*3/4;

	unsigned int max_nr_reads = throtl_grp_quantum*3/4;

	unsigned int max_nr_writes = throtl_grp_quantum - nr_reads;

	unsigned int max_nr_writes = throtl_grp_quantum - max_nr_reads;

	struct bio *bio;

	struct bio *bio;





	/* Try to dispatch 75% READS and 25% WRITES */

	/* Try to dispatch 75% READS and 25% WRITES */