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cfq-iosched: reduce bit operations in cfq_choose_req()

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Reduce the number of bit operations in cfq_choose_req() on average
(and worst) cases.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Namhyung Kim
2011-05-24 10:23:21 +02:00
committed by Jens Axboe
parent b9f8ce0599
commit 229836bd63
1 changed files with 5 additions and 9 deletions
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14
block/cfq-iosched.c
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@@ -667,15 +667,11 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2,
if (rq2 == NULL) if (rq2 == NULL)
return rq1; return rq1;
if (rq_is_sync(rq1) && !rq_is_sync(rq2)) if (rq_is_sync(rq1) != rq_is_sync(rq2))
return rq1; return rq_is_sync(rq1) ? rq1 : rq2;
else if (rq_is_sync(rq2) && !rq_is_sync(rq1))
return rq2; if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_META)
if ((rq1->cmd_flags & REQ_META) && !(rq2->cmd_flags & REQ_META)) return rq1->cmd_flags & REQ_META ? rq1 : rq2;
return rq1;
else if ((rq2->cmd_flags & REQ_META) &&
!(rq1->cmd_flags & REQ_META))
return rq2;
s1 = blk_rq_pos(rq1); s1 = blk_rq_pos(rq1);
s2 = blk_rq_pos(rq2); s2 = blk_rq_pos(rq2);