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block: track request size in blk_issue_stat

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Currently there is no way to know the request size when the request is
finished. Next patch will need this info. We could add extra field to
record the size, but blk_issue_stat has enough space to record it, so
this patch just overloads blk_issue_stat. With this, we will have 49bits
to track time, which still is very long time.

Signed-off-by: Shaohua Li <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Shaohua Li 2017-03-27 15:19:41 -07:00 • committed by Jens Axboe
commit 88eeca495b
5 changed files with 38 additions and 19 deletions
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10
block/blk-wbt.h
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@ -32,27 +32,27 @@ enum {
static inline void wbt_clear_state(struct blk_issue_stat *stat)
{
stat->time &= BLK_STAT_TIME_MASK;
stat->stat &= ~BLK_STAT_RES_MASK;
}
static inline enum wbt_flags wbt_stat_to_mask(struct blk_issue_stat *stat)
{
return (stat->time & BLK_STAT_MASK) >> BLK_STAT_SHIFT;
return (stat->stat & BLK_STAT_RES_MASK) >> BLK_STAT_RES_SHIFT;
}
static inline void wbt_track(struct blk_issue_stat *stat, enum wbt_flags wb_acct)
{
stat->time |= ((u64) wb_acct) << BLK_STAT_SHIFT;
stat->stat |= ((u64) wb_acct) << BLK_STAT_RES_SHIFT;
}
static inline bool wbt_is_tracked(struct blk_issue_stat *stat)
{
return (stat->time >> BLK_STAT_SHIFT) & WBT_TRACKED;
return (stat->stat >> BLK_STAT_RES_SHIFT) & WBT_TRACKED;
}
static inline bool wbt_is_read(struct blk_issue_stat *stat)
{
return (stat->time >> BLK_STAT_SHIFT) & WBT_READ;
return (stat->stat >> BLK_STAT_RES_SHIFT) & WBT_READ;
}
struct rq_wait {