* [PATCH v4 0/3] block/dm: fix bio-based DM IO accounting
@ 2022-01-28 15:58 ` Mike Snitzer
0 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: hch, dm-devel, linux-block
[this v4 is final iteration, should be "ready"...]
Hi Jens,
Just over 3 years ago, with commit a1e1cb72d9649 ("dm: fix redundant
IO accounting for bios that need splitting") I focused too narrowly on
fixing the reported potential for redundant accounting for IO totals.
Which, at least mentally for me, papered over how inaccurate all other
bio-based DM's IO accounting is for bios that get split.
This set fixes things up properly by allowing DM to start IO
accounting _after_ IO is submitted and a split may have occurred. The
proper start_time is still established (prior to submission), it is
passed in to a new bio_start_io_acct_time(). This eliminates the need
for any DM hack to rewind block core's accounting that was started
before any potential bio split.
All said: If you'd provide your Acked-by(s) I'm happy to send this set
to Linus for v5.17-rc (and shepherd the changes into stable@ kernels).
Or you're welcome to pickup this set to send along (I'd obviously
still do any stable@ backports). NOTE: the 3rd patch references the
linux-dm.git commit id for the 1st patch.. so that'll require tweaking
no matter who sends the changes to Linus.
Please advise, thanks.
Mike
v4: added Christoph's Reviewed-bys. Removed READ_ONCE from patch 3
v3: fix patch 3 to call bio_start_io_acct_time
v2: made block changes suggested by Christoph
Mike Snitzer (3):
block: add bio_start_io_acct_time() to control start_time
dm: revert partial fix for redundant bio-based IO accounting
dm: properly fix redundant bio-based IO accounting
block/blk-core.c | 25 +++++++++++++++++++------
drivers/md/dm.c | 20 +++-----------------
include/linux/blkdev.h | 1 +
3 files changed, 23 insertions(+), 23 deletions(-)
--
2.15.0
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dm-devel] [PATCH v4 0/3] block/dm: fix bio-based DM IO accounting
@ 2022-01-28 15:58 ` Mike Snitzer
0 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: linux-block, dm-devel, hch
[this v4 is final iteration, should be "ready"...]
Hi Jens,
Just over 3 years ago, with commit a1e1cb72d9649 ("dm: fix redundant
IO accounting for bios that need splitting") I focused too narrowly on
fixing the reported potential for redundant accounting for IO totals.
Which, at least mentally for me, papered over how inaccurate all other
bio-based DM's IO accounting is for bios that get split.
This set fixes things up properly by allowing DM to start IO
accounting _after_ IO is submitted and a split may have occurred. The
proper start_time is still established (prior to submission), it is
passed in to a new bio_start_io_acct_time(). This eliminates the need
for any DM hack to rewind block core's accounting that was started
before any potential bio split.
All said: If you'd provide your Acked-by(s) I'm happy to send this set
to Linus for v5.17-rc (and shepherd the changes into stable@ kernels).
Or you're welcome to pickup this set to send along (I'd obviously
still do any stable@ backports). NOTE: the 3rd patch references the
linux-dm.git commit id for the 1st patch.. so that'll require tweaking
no matter who sends the changes to Linus.
Please advise, thanks.
Mike
v4: added Christoph's Reviewed-bys. Removed READ_ONCE from patch 3
v3: fix patch 3 to call bio_start_io_acct_time
v2: made block changes suggested by Christoph
Mike Snitzer (3):
block: add bio_start_io_acct_time() to control start_time
dm: revert partial fix for redundant bio-based IO accounting
dm: properly fix redundant bio-based IO accounting
block/blk-core.c | 25 +++++++++++++++++++------
drivers/md/dm.c | 20 +++-----------------
include/linux/blkdev.h | 1 +
3 files changed, 23 insertions(+), 23 deletions(-)
--
2.15.0
--
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dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply [flat|nested] 10+ messages in thread
* [dm-devel] [PATCH v4 1/3] block: add bio_start_io_acct_time() to control start_time
2022-01-28 15:58 ` [dm-devel] " Mike Snitzer
@ 2022-01-28 15:58 ` Mike Snitzer
-1 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: linux-block, dm-devel, hch
bio_start_io_acct_time() interface is like bio_start_io_acct() that
allows start_time to be passed in. This gives drivers the ability to
defer starting accounting until after IO is issued (but possibily not
entirely due to bio splitting).
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
block/blk-core.c | 25 +++++++++++++++++++------
include/linux/blkdev.h | 1 +
2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 97f8bc8d3a79..d93e3bb9a769 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1061,20 +1061,32 @@ void update_io_ticks(struct block_device *part, unsigned long now, bool end)
}
static unsigned long __part_start_io_acct(struct block_device *part,
- unsigned int sectors, unsigned int op)
+ unsigned int sectors, unsigned int op,
+ unsigned long start_time)
{
const int sgrp = op_stat_group(op);
- unsigned long now = READ_ONCE(jiffies);
part_stat_lock();
- update_io_ticks(part, now, false);
+ update_io_ticks(part, start_time, false);
part_stat_inc(part, ios[sgrp]);
part_stat_add(part, sectors[sgrp], sectors);
part_stat_local_inc(part, in_flight[op_is_write(op)]);
part_stat_unlock();
- return now;
+ return start_time;
+}
+
+/**
+ * bio_start_io_acct_time - start I/O accounting for bio based drivers
+ * @bio: bio to start account for
+ * @start_time: start time that should be passed back to bio_end_io_acct().
+ */
+void bio_start_io_acct_time(struct bio *bio, unsigned long start_time)
+{
+ __part_start_io_acct(bio->bi_bdev, bio_sectors(bio),
+ bio_op(bio), start_time);
}
+EXPORT_SYMBOL_GPL(bio_start_io_acct_time);
/**
* bio_start_io_acct - start I/O accounting for bio based drivers
@@ -1084,14 +1096,15 @@ static unsigned long __part_start_io_acct(struct block_device *part,
*/
unsigned long bio_start_io_acct(struct bio *bio)
{
- return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio), bio_op(bio));
+ return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio),
+ bio_op(bio), jiffies);
}
EXPORT_SYMBOL_GPL(bio_start_io_acct);
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
unsigned int op)
{
- return __part_start_io_acct(disk->part0, sectors, op);
+ return __part_start_io_acct(disk->part0, sectors, op, jiffies);
}
EXPORT_SYMBOL(disk_start_io_acct);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9c95df26fc26..f35aea98bc35 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1258,6 +1258,7 @@ unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
unsigned long start_time);
+void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
unsigned long bio_start_io_acct(struct bio *bio);
void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
struct block_device *orig_bdev);
--
2.15.0
--
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dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH v4 1/3] block: add bio_start_io_acct_time() to control start_time
@ 2022-01-28 15:58 ` Mike Snitzer
0 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: hch, dm-devel, linux-block
bio_start_io_acct_time() interface is like bio_start_io_acct() that
allows start_time to be passed in. This gives drivers the ability to
defer starting accounting until after IO is issued (but possibily not
entirely due to bio splitting).
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
block/blk-core.c | 25 +++++++++++++++++++------
include/linux/blkdev.h | 1 +
2 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index 97f8bc8d3a79..d93e3bb9a769 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1061,20 +1061,32 @@ void update_io_ticks(struct block_device *part, unsigned long now, bool end)
}
static unsigned long __part_start_io_acct(struct block_device *part,
- unsigned int sectors, unsigned int op)
+ unsigned int sectors, unsigned int op,
+ unsigned long start_time)
{
const int sgrp = op_stat_group(op);
- unsigned long now = READ_ONCE(jiffies);
part_stat_lock();
- update_io_ticks(part, now, false);
+ update_io_ticks(part, start_time, false);
part_stat_inc(part, ios[sgrp]);
part_stat_add(part, sectors[sgrp], sectors);
part_stat_local_inc(part, in_flight[op_is_write(op)]);
part_stat_unlock();
- return now;
+ return start_time;
+}
+
+/**
+ * bio_start_io_acct_time - start I/O accounting for bio based drivers
+ * @bio: bio to start account for
+ * @start_time: start time that should be passed back to bio_end_io_acct().
+ */
+void bio_start_io_acct_time(struct bio *bio, unsigned long start_time)
+{
+ __part_start_io_acct(bio->bi_bdev, bio_sectors(bio),
+ bio_op(bio), start_time);
}
+EXPORT_SYMBOL_GPL(bio_start_io_acct_time);
/**
* bio_start_io_acct - start I/O accounting for bio based drivers
@@ -1084,14 +1096,15 @@ static unsigned long __part_start_io_acct(struct block_device *part,
*/
unsigned long bio_start_io_acct(struct bio *bio)
{
- return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio), bio_op(bio));
+ return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio),
+ bio_op(bio), jiffies);
}
EXPORT_SYMBOL_GPL(bio_start_io_acct);
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
unsigned int op)
{
- return __part_start_io_acct(disk->part0, sectors, op);
+ return __part_start_io_acct(disk->part0, sectors, op, jiffies);
}
EXPORT_SYMBOL(disk_start_io_acct);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9c95df26fc26..f35aea98bc35 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1258,6 +1258,7 @@ unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
unsigned long start_time);
+void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);
unsigned long bio_start_io_acct(struct bio *bio);
void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
struct block_device *orig_bdev);
--
2.15.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH v4 2/3] dm: revert partial fix for redundant bio-based IO accounting
2022-01-28 15:58 ` [dm-devel] " Mike Snitzer
@ 2022-01-28 15:58 ` Mike Snitzer
-1 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: hch, dm-devel, linux-block
Reverts a1e1cb72d9649 ("dm: fix redundant IO accounting for bios that
need splitting") because it was too narrow in scope (only addressed
redundant 'sectors[]' accounting and not ios, nsecs[], etc).
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c0ae8087c602..9849114b3c08 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1442,9 +1442,6 @@ static void init_clone_info(struct clone_info *ci, struct mapped_device *md,
ci->sector = bio->bi_iter.bi_sector;
}
-#define __dm_part_stat_sub(part, field, subnd) \
- (part_stat_get(part, field) -= (subnd))
-
/*
* Entry point to split a bio into clones and submit them to the targets.
*/
@@ -1480,18 +1477,6 @@ static void __split_and_process_bio(struct mapped_device *md,
GFP_NOIO, &md->queue->bio_split);
ci.io->orig_bio = b;
- /*
- * Adjust IO stats for each split, otherwise upon queue
- * reentry there will be redundant IO accounting.
- * NOTE: this is a stop-gap fix, a proper fix involves
- * significant refactoring of DM core's bio splitting
- * (by eliminating DM's splitting and just using bio_split)
- */
- part_stat_lock();
- __dm_part_stat_sub(dm_disk(md)->part0,
- sectors[op_stat_group(bio_op(bio))], ci.sector_count);
- part_stat_unlock();
-
bio_chain(b, bio);
trace_block_split(b, bio->bi_iter.bi_sector);
submit_bio_noacct(bio);
--
2.15.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [dm-devel] [PATCH v4 2/3] dm: revert partial fix for redundant bio-based IO accounting
@ 2022-01-28 15:58 ` Mike Snitzer
0 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: linux-block, dm-devel, hch
Reverts a1e1cb72d9649 ("dm: fix redundant IO accounting for bios that
need splitting") because it was too narrow in scope (only addressed
redundant 'sectors[]' accounting and not ios, nsecs[], etc).
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 15 ---------------
1 file changed, 15 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index c0ae8087c602..9849114b3c08 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1442,9 +1442,6 @@ static void init_clone_info(struct clone_info *ci, struct mapped_device *md,
ci->sector = bio->bi_iter.bi_sector;
}
-#define __dm_part_stat_sub(part, field, subnd) \
- (part_stat_get(part, field) -= (subnd))
-
/*
* Entry point to split a bio into clones and submit them to the targets.
*/
@@ -1480,18 +1477,6 @@ static void __split_and_process_bio(struct mapped_device *md,
GFP_NOIO, &md->queue->bio_split);
ci.io->orig_bio = b;
- /*
- * Adjust IO stats for each split, otherwise upon queue
- * reentry there will be redundant IO accounting.
- * NOTE: this is a stop-gap fix, a proper fix involves
- * significant refactoring of DM core's bio splitting
- * (by eliminating DM's splitting and just using bio_split)
- */
- part_stat_lock();
- __dm_part_stat_sub(dm_disk(md)->part0,
- sectors[op_stat_group(bio_op(bio))], ci.sector_count);
- part_stat_unlock();
-
bio_chain(b, bio);
trace_block_split(b, bio->bi_iter.bi_sector);
submit_bio_noacct(bio);
--
2.15.0
--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [dm-devel] [PATCH v4 3/3] dm: properly fix redundant bio-based IO accounting
2022-01-28 15:58 ` [dm-devel] " Mike Snitzer
@ 2022-01-28 15:58 ` Mike Snitzer
-1 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: linux-block, dm-devel, hch
Record the start_time for a bio but defer the starting block core's IO
accounting until after IO is submitted using bio_start_io_acct_time().
This approach avoids the need to mess around with any of the
individual IO stats in response to a bio_split() that follows bio
submission.
Reported-by: Bud Brown <bubrown@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Depends-on: 1073e8492f88 ("block: add bio_start_io_acct_time() to control start_time")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9849114b3c08..dcbd6d201619 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -489,7 +489,7 @@ static void start_io_acct(struct dm_io *io)
struct mapped_device *md = io->md;
struct bio *bio = io->orig_bio;
- io->start_time = bio_start_io_acct(bio);
+ bio_start_io_acct_time(bio, io->start_time);
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
bio->bi_iter.bi_sector, bio_sectors(bio),
@@ -535,7 +535,7 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
io->md = md;
spin_lock_init(&io->endio_lock);
- start_io_acct(io);
+ io->start_time = jiffies;
return io;
}
@@ -1482,6 +1482,7 @@ static void __split_and_process_bio(struct mapped_device *md,
submit_bio_noacct(bio);
}
}
+ start_io_acct(ci.io);
/* drop the extra reference count */
dm_io_dec_pending(ci.io, errno_to_blk_status(error));
--
2.15.0
--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH v4 3/3] dm: properly fix redundant bio-based IO accounting
@ 2022-01-28 15:58 ` Mike Snitzer
0 siblings, 0 replies; 10+ messages in thread
From: Mike Snitzer @ 2022-01-28 15:58 UTC (permalink / raw)
To: axboe; +Cc: hch, dm-devel, linux-block
Record the start_time for a bio but defer the starting block core's IO
accounting until after IO is submitted using bio_start_io_acct_time().
This approach avoids the need to mess around with any of the
individual IO stats in response to a bio_split() that follows bio
submission.
Reported-by: Bud Brown <bubrown@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Depends-on: 1073e8492f88 ("block: add bio_start_io_acct_time() to control start_time")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9849114b3c08..dcbd6d201619 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -489,7 +489,7 @@ static void start_io_acct(struct dm_io *io)
struct mapped_device *md = io->md;
struct bio *bio = io->orig_bio;
- io->start_time = bio_start_io_acct(bio);
+ bio_start_io_acct_time(bio, io->start_time);
if (unlikely(dm_stats_used(&md->stats)))
dm_stats_account_io(&md->stats, bio_data_dir(bio),
bio->bi_iter.bi_sector, bio_sectors(bio),
@@ -535,7 +535,7 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
io->md = md;
spin_lock_init(&io->endio_lock);
- start_io_acct(io);
+ io->start_time = jiffies;
return io;
}
@@ -1482,6 +1482,7 @@ static void __split_and_process_bio(struct mapped_device *md,
submit_bio_noacct(bio);
}
}
+ start_io_acct(ci.io);
/* drop the extra reference count */
dm_io_dec_pending(ci.io, errno_to_blk_status(error));
--
2.15.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [dm-devel] [PATCH v4 0/3] block/dm: fix bio-based DM IO accounting
2022-01-28 15:58 ` [dm-devel] " Mike Snitzer
@ 2022-01-28 17:19 ` Jens Axboe
-1 siblings, 0 replies; 10+ messages in thread
From: Jens Axboe @ 2022-01-28 17:19 UTC (permalink / raw)
To: Mike Snitzer; +Cc: linux-block, dm-devel, hch
On Fri, 28 Jan 2022 10:58:38 -0500, Mike Snitzer wrote:
> [this v4 is final iteration, should be "ready"...]
>
> Hi Jens,
>
> Just over 3 years ago, with commit a1e1cb72d9649 ("dm: fix redundant
> IO accounting for bios that need splitting") I focused too narrowly on
> fixing the reported potential for redundant accounting for IO totals.
> Which, at least mentally for me, papered over how inaccurate all other
> bio-based DM's IO accounting is for bios that get split.
>
> [...]
Applied, thanks!
[1/3] block: add bio_start_io_acct_time() to control start_time
commit: 5a6cd1d29f2104bd0306a0f839c8b328395b784f
[2/3] dm: revert partial fix for redundant bio-based IO accounting
commit: b6e31a39c63e0214937c8c586faa10122913e935
[3/3] dm: properly fix redundant bio-based IO accounting
commit: 3c4ae3478082388ae9680a932d6bfd54c10fca0d
Best regards,
--
Jens Axboe
--
dm-devel mailing list
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https://listman.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH v4 0/3] block/dm: fix bio-based DM IO accounting
@ 2022-01-28 17:19 ` Jens Axboe
0 siblings, 0 replies; 10+ messages in thread
From: Jens Axboe @ 2022-01-28 17:19 UTC (permalink / raw)
To: Mike Snitzer; +Cc: linux-block, dm-devel, hch
On Fri, 28 Jan 2022 10:58:38 -0500, Mike Snitzer wrote:
> [this v4 is final iteration, should be "ready"...]
>
> Hi Jens,
>
> Just over 3 years ago, with commit a1e1cb72d9649 ("dm: fix redundant
> IO accounting for bios that need splitting") I focused too narrowly on
> fixing the reported potential for redundant accounting for IO totals.
> Which, at least mentally for me, papered over how inaccurate all other
> bio-based DM's IO accounting is for bios that get split.
>
> [...]
Applied, thanks!
[1/3] block: add bio_start_io_acct_time() to control start_time
commit: 5a6cd1d29f2104bd0306a0f839c8b328395b784f
[2/3] dm: revert partial fix for redundant bio-based IO accounting
commit: b6e31a39c63e0214937c8c586faa10122913e935
[3/3] dm: properly fix redundant bio-based IO accounting
commit: 3c4ae3478082388ae9680a932d6bfd54c10fca0d
Best regards,
--
Jens Axboe
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2022-01-28 17:20 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-01-28 15:58 [PATCH v4 0/3] block/dm: fix bio-based DM IO accounting Mike Snitzer
2022-01-28 15:58 ` [dm-devel] " Mike Snitzer
2022-01-28 15:58 ` [dm-devel] [PATCH v4 1/3] block: add bio_start_io_acct_time() to control start_time Mike Snitzer
2022-01-28 15:58 ` Mike Snitzer
2022-01-28 15:58 ` [PATCH v4 2/3] dm: revert partial fix for redundant bio-based IO accounting Mike Snitzer
2022-01-28 15:58 ` [dm-devel] " Mike Snitzer
2022-01-28 15:58 ` [dm-devel] [PATCH v4 3/3] dm: properly fix " Mike Snitzer
2022-01-28 15:58 ` Mike Snitzer
2022-01-28 17:19 ` [dm-devel] [PATCH v4 0/3] block/dm: fix bio-based DM " Jens Axboe
2022-01-28 17:19 ` Jens Axboe
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