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block: get rid of struct blk_issue_stat

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struct blk_issue_stat squashes three things into one u64:

- The time the driver started working on a request
- The original size of the request (for the io.low controller)
- Flags for writeback throttling

It turns out that on x86_64, we have a 4 byte hole in struct request
which we can fill with the non-timestamp fields from blk_issue_stat,
simplifying things quite a bit.

Signed-off-by: Omar Sandoval <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Omar Sandoval 2018-05-09 02:08:50 -07:00 • committed by Jens Axboe
commit 544ccc8dc9
10 changed files with 41 additions and 77 deletions
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4
block/blk-wbt.h
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@ -63,7 +63,7 @@ struct rq_wb {
struct blk_stat_callback *cb;
s64 sync_issue;
u64 sync_issue;
void *sync_cookie;
unsigned int wc;
@ -90,7 +90,7 @@ static inline unsigned int wbt_inflight(struct rq_wb *rwb)
static inline void wbt_track(struct request *rq, enum wbt_flags flags)
{
rq->issue_stat.stat |= ((u64)flags) << BLK_STAT_RES_SHIFT;
rq->wbt_flags |= flags;
}
void __wbt_done(struct rq_wb *, enum wbt_flags);