linux-kernel - [PATCH 4.19 012/361] bcache: trace missed reading by cache

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Message-Id: <20181111221621.621712332@linuxfoundation.org>
Date:   Sun, 11 Nov 2018 14:15:59 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tang Junhui <tang.junhui.linux@...il.com>,
        Coly Li <colyli@...e.de>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.19 012/361] bcache: trace missed reading by cache_missed

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tang Junhui <tang.junhui.linux@...il.com>

commit 502b291568fc7faf1ebdb2c2590f12851db0ff76 upstream.

Missed reading IOs are identified by s->cache_missed, not the
s->cache_miss, so in trace_bcache_read() using trace_bcache_read
to identify whether the IO is missed or not.

Signed-off-by: Tang Junhui <tang.junhui.linux@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Coly Li <colyli@...e.de>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bcache/request.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -850,7 +850,7 @@ static void cached_dev_read_done_bh(stru
 
 	bch_mark_cache_accounting(s->iop.c, s->d,
 				  !s->cache_missed, s->iop.bypass);
-	trace_bcache_read(s->orig_bio, !s->cache_miss, s->iop.bypass);
+	trace_bcache_read(s->orig_bio, !s->cache_missed, s->iop.bypass);
 
 	if (s->iop.status)
 		continue_at_nobarrier(cl, cached_dev_read_error, bcache_wq);