On 2024/8/23 15:25, Yongpeng Yang wrote:
blk_fill_rwbs function currently does not recognize REQ_POLLED I/O,
it's not convenient to trace the I/O handling process on the
HCTX_TYPE_POLL type hardware queue. Add a 'P' identifier to 'rwbs'
to mark such I/O for tracing.
Signed-off-by: Yongpeng Yang <yangyongpeng1@xxxxxxxx>
---
kernel/trace/blktrace.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 8fd292d34d89..69b7857d0189 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1908,6 +1908,8 @@ void blk_fill_rwbs(char *rwbs, blk_opf_t opf)
rwbs[i++] = 'S';
if (opf & REQ_META)
rwbs[i++] = 'M';
+ if (opf & REQ_POLLED)
+ rwbs[i++] = 'P';
DECLARE_EVENT_CLASS(bio,
TP_PROTO(struct bio *bio),
TP_ARGS(bio),
TP_STRUCT__entry(
__field(dev_t, dev )
__field(sector_t, sector )
__field(unsigned int, nr_sector )
__array(char, rwbs, 6 )
),
Not sure, maybe we need to expand one more byte for rwbs array, if
REQ_POLLED flag can be Ored w/ other flags.
Thanks,
rwbs[i] = '\0';
}
