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Commit 7457e6e2 authored by Jens Axboe's avatar Jens Axboe Committed by Jens Axboe
Browse files

[PATCH] blktrace: support for logging metadata reads 



Signed-off-by: default avatarJens Axboe <axboe@suse.de>
parent 374f84ac

block/blktrace.c

+4 −1
Original line number Diff line number Diff line
@@ -69,7 +69,7 @@ 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[5] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_ACT(BLK_TC_SYNC), 0, BLK_TC_ACT(BLK_TC_AHEAD) };

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) };



/*

 * More could be added as needed, taking care to increment the decrementer
@@ -81,6 +81,8 @@ static u32 bio_act[5] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_AC 
	(((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1))

#define trace_ahead_bit(rw)	\

	(((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD))

#define trace_meta_bit(rw)	\

	(((rw) & (1 << BIO_RW_META)) >> (BIO_RW_META - 3))



/*

 * The worker for the various blk_add_trace*() types. Fills out a
@@ -103,6 +105,7 @@ void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes, 
	what |= bio_act[trace_barrier_bit(rw)];

	what |= bio_act[trace_sync_bit(rw)];

	what |= bio_act[trace_ahead_bit(rw)];

	what |= bio_act[trace_meta_bit(rw)];



	pid = tsk->pid;

	if (unlikely(act_log_check(bt, what, sector, pid)))

include/linux/blktrace_api.h

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ enum blktrace_cat { 
	BLK_TC_PC	= 1 << 9,	/* pc requests */

	BLK_TC_NOTIFY	= 1 << 10,	/* special message */

	BLK_TC_AHEAD	= 1 << 11,	/* readahead */

	BLK_TC_META	= 1 << 12,	/* metadata */



	BLK_TC_END	= 1 << 15,	/* only 16-bits, reminder */

};