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author | Tao Ma <boyu.mt@taobao.com> | 2011-03-11 20:11:59 +0100 |
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committer | Jens Axboe <jaxboe@fusionio.com> | 2011-03-11 20:11:59 +0100 |
commit | 805f6b5e1cbfedfb9b3d354013e7f4b13a79270f (patch) | |
tree | 73b3380e28c642418a0fa3e5f1da9990919325b5 /block/blk-lib.c | |
parent | Merge branch 'for-2.6.39/stack-plug' into for-2.6.39/core (diff) | |
download | linux-805f6b5e1cbfedfb9b3d354013e7f4b13a79270f.tar.xz linux-805f6b5e1cbfedfb9b3d354013e7f4b13a79270f.zip |
blktrace: Use rq->cmd_flags directly in blk_add_trace_rq.
In blk_add_trace_rq, we only chose the minor 2 bits from
request's cmd_flags and did some check for discard.
so most of other flags(e.g, REQ_SYNC) are missing.
For example, with a sync write after blkparse we get:
8,16 1 1 0.001776503 7509 A WS 1349632 + 1024 <- (8,17) 1347584
8,16 1 2 0.001776813 7509 Q WS 1349632 + 1024 [dd]
8,16 1 3 0.001780395 7509 G WS 1349632 + 1024 [dd]
8,16 1 5 0.001783186 7509 I W 1349632 + 1024 [dd]
8,16 1 11 0.001816987 7509 D W 1349632 + 1024 [dd]
8,16 0 2 0.006218192 0 C W 1349632 + 1024 [0]
Since now we have integrated the flags of both bio and request,
it is safe to pass rq->cmd_flags directly to __blk_add_trace.
With this patch, after a sync write we get:
8,16 1 1 0.001776900 5425 A WS 1189888 + 1024 <- (8,17) 1187840
8,16 1 2 0.001777179 5425 Q WS 1189888 + 1024 [dd]
8,16 1 3 0.001780797 5425 G WS 1189888 + 1024 [dd]
8,16 1 5 0.001783402 5425 I WS 1189888 + 1024 [dd]
8,16 1 11 0.001817468 5425 D WS 1189888 + 1024 [dd]
8,16 0 2 0.005640709 0 C WS 1189888 + 1024 [0]
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-lib.c')
0 files changed, 0 insertions, 0 deletions