From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
To: linux-btrace@vger.kernel.org
Subject: [RFC PATCH 14/39] blktrace: update blk_add_trace_bio_bounce()
Date: Tue, 25 Aug 2020 22:09:44 +0000 [thread overview]
Message-ID: <20200825221009.6457-15-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 c2e72cbcef4a..81d2a3ee5a92 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1292,7 +1292,25 @@ static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
static void blk_add_trace_bio_bounce(void *ignore,
struct request_queue *q, struct bio *bio)
{
- blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0);
+ u64 ta = 0;
+ struct blk_trace *bt;
+ struct blk_trace_ext *bte;
+
+ rcu_read_lock();
+ bt = rcu_dereference(q->blk_trace);
+ bte = rcu_dereference(q->blk_trace_ext);
+ if (likely(!bt) && likely(!bte)) {
+ rcu_read_unlock();
+ return;
+ }
+
+ if (bt) {
+ ta = BLK_TA_BOUNCE;
+ } else if (bte) {
+ ta = BLK_TA_BOUNCE_EXT;
+ }
+ rcu_read_unlock();
+ blk_add_trace_bio(q, bio, ta, 0);
}
static void blk_add_trace_bio_complete(void *ignore,
--
2.22.1
next reply other threads:[~2020-08-25 22:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 22:09 Chaitanya Kulkarni [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-11-05 2:40 [RFC PATCH 14/39] blktrace: update blk_add_trace_bio_bounce() Chaitanya Kulkarni
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