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blktrace: fix wrong calculation of RWBS 

Impact: fix the output of IO type category characters

Trace categories are the upper 16 bits, not the lower 16 bits.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <49C89432.8010805@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
hifive-unleashed-5.1
Li Zefan 2009-03-24 16:05:06 +08:00 committed by Ingo Molnar
parent e4955c9986
commit 65796348e0
1 changed files with 7 additions and 6 deletions
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13
kernel/trace/blktrace.c
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@ -922,23 +922,24 @@ static void blk_unregister_tracepoints(void)
static void fill_rwbs(char *rwbs, const struct blk_io_trace *t)
{
int i = 0;
int tc = t->action >> BLK_TC_SHIFT;
if (t->action & BLK_TC_DISCARD)
if (tc & BLK_TC_DISCARD)
rwbs[i++] = 'D';
else if (t->action & BLK_TC_WRITE)
else if (tc & BLK_TC_WRITE)
rwbs[i++] = 'W';
else if (t->bytes)
rwbs[i++] = 'R';
else
rwbs[i++] = 'N';
if (t->action & BLK_TC_AHEAD)
if (tc & BLK_TC_AHEAD)
rwbs[i++] = 'A';
if (t->action & BLK_TC_BARRIER)
if (tc & BLK_TC_BARRIER)
rwbs[i++] = 'B';
if (t->action & BLK_TC_SYNC)
if (tc & BLK_TC_SYNC)
rwbs[i++] = 'S';
if (t->action & BLK_TC_META)
if (tc & BLK_TC_META)
rwbs[i++] = 'M';
rwbs[i] = '\0';