From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
To: linux-btrace@vger.kernel.org
Subject: [RFC PATCH 10/39] blktrace: update blk_add_trace_rq_issue()
Date: Thu, 05 Nov 2020 02:40:09 +0000 [thread overview]
Message-ID: <20201105024038.5831-11-chaitanya.kulkarni@wdc.com> (raw)
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
kernel/trace/blktrace.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 152ca769ce5b..6444f4c5df98 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1169,7 +1169,25 @@ static void blk_add_trace_rq_insert(void *ignore,
static void blk_add_trace_rq_issue(void *ignore,
struct request_queue *q, struct request *rq)
{
- blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), BLK_TA_ISSUE,
+ u64 ta;
+ struct blk_trace *bt;
+ struct blk_trace_ext *bte;
+
+ rcu_read_lock();
+ bt = rcu_dereference(rq->q->blk_trace);
+ bte = rcu_dereference(rq->q->blk_trace_ext);
+ if (likely(!bt) && likely(!bte)) {
+ rcu_read_unlock();
+ return;
+ }
+
+ if (bt) {
+ ta = BLK_TA_ISSUE;
+ } else if (bte) {
+ ta = BLK_TA_ISSUE_EXT;
+ }
+ rcu_read_unlock();
+ blk_add_trace_rq(rq, 0, blk_rq_bytes(rq), ta,
blk_trace_request_get_cgid(q, rq));
}
--
2.22.1
next reply other threads:[~2020-11-05 2:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-05 2:40 Chaitanya Kulkarni [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-08-25 22:09 [RFC PATCH 10/39] blktrace: update blk_add_trace_rq_issue() Chaitanya Kulkarni
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