From: Mike Snitzer <snitzer@kernel.org>
To: dm-devel@redhat.com
Cc: ebiggers@kernel.org, keescook@chromium.org, heinzm@redhat.com,
Mike Snitzer <snitzer@kernel.org>,
nhuck@google.com, linux-block@vger.kernel.org, ejt@redhat.com,
mpatocka@redhat.com, luomeng12@huawei.com
Subject: [dm-devel] [dm-6.4 PATCH v2 5/9] dm bufio: use waitqueue_active in __free_buffer_wake
Date: Fri, 24 Mar 2023 13:56:52 -0400 [thread overview]
Message-ID: <20230324175656.85082-6-snitzer@kernel.org> (raw)
In-Reply-To: <20230324175656.85082-1-snitzer@kernel.org>
From: Mikulas Patocka <mpatocka@redhat.com>
Save one spinlock by using waitqueue_active. We hold the bufio lock at
this place, so no one can add entries to the waitqueue at this point.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
drivers/md/dm-bufio.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 929685011e02..b638ddd161b4 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1669,7 +1669,12 @@ static void __free_buffer_wake(struct dm_buffer *b)
c->need_reserved_buffers--;
}
- wake_up(&c->free_buffer_wait);
+ /*
+ * We hold the bufio lock here, so no one can add entries to the
+ * wait queue anyway.
+ */
+ if (unlikely(waitqueue_active(&c->free_buffer_wait)))
+ wake_up(&c->free_buffer_wait);
}
static enum evict_result cleaned(struct dm_buffer *b, void *context)
--
2.40.0
--
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next prev parent reply other threads:[~2023-03-24 17:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-24 17:56 [dm-devel] [dm-6.4 PATCH v2 0/9] dm bufio, thin: improve concurrent IO performance Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 1/9] dm bufio: remove unused dm_bufio_release_move interface Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 2/9] dm bufio: move dm_buffer struct Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 3/9] dm bufio: improve concurrent IO performance Mike Snitzer
2023-03-24 19:34 ` Jens Axboe
2023-03-24 22:53 ` Mike Snitzer
2023-03-24 23:11 ` Jens Axboe
2023-03-25 4:21 ` Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 4/9] dm bufio: move dm_bufio_client members to avoid spanning cachelines Mike Snitzer
2023-03-24 17:56 ` Mike Snitzer [this message]
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 6/9] dm bufio: use multi-page bio vector Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 7/9] dm thin: speed up cell_defer_no_holder() Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 8/9] dm: split discards further if target sets max_discard_granularity Mike Snitzer
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 9/9] dm bio prison v1: improve concurrent IO performance Mike Snitzer
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