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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 7/9] dm thin: speed up cell_defer_no_holder()
Date: Fri, 24 Mar 2023 13:56:54 -0400	[thread overview]
Message-ID: <20230324175656.85082-8-snitzer@kernel.org> (raw)
In-Reply-To: <20230324175656.85082-1-snitzer@kernel.org>

From: Joe Thornber <ejt@redhat.com>

Reduce the time that a spinlock is held in cell_defer_no_holder().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 drivers/md/dm-thin.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 13d4677baafd..00323428919e 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -883,15 +883,17 @@ static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *c
 {
 	struct pool *pool = tc->pool;
 	unsigned long flags;
-	int has_work;
+	struct bio_list bios;
 
-	spin_lock_irqsave(&tc->lock, flags);
-	cell_release_no_holder(pool, cell, &tc->deferred_bio_list);
-	has_work = !bio_list_empty(&tc->deferred_bio_list);
-	spin_unlock_irqrestore(&tc->lock, flags);
+	bio_list_init(&bios);
+	cell_release_no_holder(pool, cell, &bios);
 
-	if (has_work)
+	if (!bio_list_empty(&bios)) {
+		spin_lock_irqsave(&tc->lock, flags);
+		bio_list_merge(&tc->deferred_bio_list, &bios);
+		spin_unlock_irqrestore(&tc->lock, flags);
 		wake_worker(pool);
+	}
 }
 
 static void thin_defer_bio(struct thin_c *tc, struct bio *bio);
-- 
2.40.0

--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel


WARNING: multiple messages have this Message-ID (diff)
From: Mike Snitzer <snitzer@kernel.org>
To: dm-devel@redhat.com
Cc: linux-block@vger.kernel.org, ejt@redhat.com, mpatocka@redhat.com,
	heinzm@redhat.com, nhuck@google.com, ebiggers@kernel.org,
	keescook@chromium.org, luomeng12@huawei.com,
	Mike Snitzer <snitzer@kernel.org>
Subject: [dm-6.4 PATCH v2 7/9] dm thin: speed up cell_defer_no_holder()
Date: Fri, 24 Mar 2023 13:56:54 -0400	[thread overview]
Message-ID: <20230324175656.85082-8-snitzer@kernel.org> (raw)
In-Reply-To: <20230324175656.85082-1-snitzer@kernel.org>

From: Joe Thornber <ejt@redhat.com>

Reduce the time that a spinlock is held in cell_defer_no_holder().

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 drivers/md/dm-thin.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 13d4677baafd..00323428919e 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -883,15 +883,17 @@ static void cell_defer_no_holder(struct thin_c *tc, struct dm_bio_prison_cell *c
 {
 	struct pool *pool = tc->pool;
 	unsigned long flags;
-	int has_work;
+	struct bio_list bios;
 
-	spin_lock_irqsave(&tc->lock, flags);
-	cell_release_no_holder(pool, cell, &tc->deferred_bio_list);
-	has_work = !bio_list_empty(&tc->deferred_bio_list);
-	spin_unlock_irqrestore(&tc->lock, flags);
+	bio_list_init(&bios);
+	cell_release_no_holder(pool, cell, &bios);
 
-	if (has_work)
+	if (!bio_list_empty(&bios)) {
+		spin_lock_irqsave(&tc->lock, flags);
+		bio_list_merge(&tc->deferred_bio_list, &bios);
+		spin_unlock_irqrestore(&tc->lock, flags);
 		wake_worker(pool);
+	}
 }
 
 static void thin_defer_bio(struct thin_c *tc, struct bio *bio);
-- 
2.40.0


  parent reply	other threads:[~2023-03-24 17:57 UTC|newest]

Thread overview: 28+ 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 ` 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   ` 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   ` 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 17:56   ` Mike Snitzer
2023-03-24 19:34   ` [dm-devel] " Jens Axboe
2023-03-24 19:34     ` Jens Axboe
2023-03-24 22:53     ` [dm-devel] " Mike Snitzer
2023-03-24 22:53       ` Mike Snitzer
2023-03-24 23:11       ` [dm-devel] " Jens Axboe
2023-03-24 23:11         ` Jens Axboe
2023-03-25  4:21         ` [dm-devel] " Mike Snitzer
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
2023-03-24 17:56 ` [dm-devel] [dm-6.4 PATCH v2 5/9] dm bufio: use waitqueue_active in __free_buffer_wake Mike Snitzer
2023-03-24 17:56   ` Mike Snitzer
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   ` Mike Snitzer
2023-03-24 17:56 ` Mike Snitzer [this message]
2023-03-24 17:56   ` [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   ` 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
2023-03-24 17:56   ` Mike Snitzer

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