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blktrace: support discard requests 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
David Woodhouse 2008-08-10 11:21:57 +01:00 committed by Jens Axboe
parent fdc53971bc
commit 27b29e86bf
2 changed files with 14 additions and 1 deletions
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11
block/blktrace.c
View File

@ -114,7 +114,13 @@ static u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ), BLK_TC_ACT(BLK
/*
* Bio action bits of interest
*/
static u32 bio_act[9] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_ACT(BLK_TC_SYNC), 0, BLK_TC_ACT(BLK_TC_AHEAD), 0, 0, 0, BLK_TC_ACT(BLK_TC_META) };
static u32 bio_act[17] __read_mostly = {
[1] = BLK_TC_ACT(BLK_TC_BARRIER),
[2] = BLK_TC_ACT(BLK_TC_SYNC),
[4] = BLK_TC_ACT(BLK_TC_AHEAD),
[8] = BLK_TC_ACT(BLK_TC_META),
[16] = BLK_TC_ACT(BLK_TC_DISCARD)
};
/*
* More could be added as needed, taking care to increment the decrementer
@ -128,6 +134,8 @@ static u32 bio_act[9] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_AC
(((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD))
#define trace_meta_bit(rw) \
(((rw) & (1 << BIO_RW_META)) >> (BIO_RW_META - 3))
#define trace_discard_bit(rw) \
(((rw) & (1 << BIO_RW_DISCARD)) >> (BIO_RW_DISCARD - 4))
/*
* The worker for the various blk_add_trace*() types. Fills out a
@ -151,6 +159,7 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
what |= bio_act[trace_sync_bit(rw)];
what |= bio_act[trace_ahead_bit(rw)];
what |= bio_act[trace_meta_bit(rw)];
what |= bio_act[trace_discard_bit(rw)];
pid = tsk->pid;
if (unlikely(act_log_check(bt, what, sector, pid)))

4
include/linux/blktrace_api.h
View File

@ -21,6 +21,7 @@ enum blktrace_cat {
BLK_TC_NOTIFY = 1 << 10, /* special message */
BLK_TC_AHEAD = 1 << 11, /* readahead */
BLK_TC_META = 1 << 12, /* metadata */
BLK_TC_DISCARD = 1 << 13, /* discard requests */
BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
};
@ -195,6 +196,9 @@ static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
if (likely(!bt))
return;
if (blk_discard_rq(rq))
rw |= (1 << BIO_RW_DISCARD);
if (blk_pc_request(rq)) {
what |= BLK_TC_ACT(BLK_TC_PC);
__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);