On 5/25/20 4:09 AM, Damien Le Moal wrote:
On 2020/05/23 0:39, Hannes Reinecke wrote:
Checking the teriary superblock just consists of validating UUIDs,
s/teriary/tertiary
crcs, and the generation number; it doesn't have contents which
would be required during the actual operation.
So we shou
On 2020/05/26 17:25, Hannes Reinecke wrote:
> On 5/25/20 4:09 AM, Damien Le Moal wrote:
>> On 2020/05/23 0:39, Hannes Reinecke wrote:
>>> Checking the teriary superblock just consists of validating UUIDs,
>>
>> s/teriary/tertiary
>>
>>> crcs, and the generation number; it doesn't have contents whic
Hello Mickael,
Could you please share your thoughts for the below proposal.
Regards,
JK
On Sat, 16 May 2020, Jaskaran Singh Khurana wrote:
Hello Mickael,
On Thu, 14 May 2020, Mickaël Salaün wrote:
On 12/05/2020 22:46, Deven Bowers wrote:
On 5/11/2020 11:03 AM, Deven Bowers wrote:
On Mon, May 25, 2020 at 03:28:07PM +0300, Konstantin Khlebnikov wrote:
> I think it would be better to leave this jiffies legacy nonsense in
> callers and pass here request duration in nanoseconds.
jiffies is what the existing interfaces uses. But now that they come
from the start helper fixing t
Add two new helpers to simplify I/O accounting for bio based drivers.
Currently these drivers use the generic_start_io_acct and
generic_end_io_acct helpers which have very cumbersome calling
conventions, don't actually return the time they started accounting,
and try to deal with accounting for par
From: Konstantin Khlebnikov
Also rename blk_account_io_merge() into blk_account_io_merge_request() to
distinguish it from merging request and bio.
Signed-off-by: Konstantin Khlebnikov
[hch: rebased]
Signed-off-by: Christoph Hellwig
---
block/blk-merge.c | 12 +---
1 file changed, 5 in
Switch zram to use the nicer bio accounting helpers, and as part of that
ensure each bio is counted as a single I/O request.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
drivers/block/zram/zram_drv.c | 24 ++--
1 file changed, 10 insertions(+), 14
Switch drbd to use the nicer bio accounting helpers.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
drivers/block/drbd/drbd_req.c | 27 ---
1 file changed, 4 insertions(+), 23 deletions(-)
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/blo
Switch rsxx to use the nicer bio accounting helpers.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
drivers/lightnvm/pblk-cache.c | 8 +++-
drivers/lightnvm/pblk-read.c | 11 ---
2 files changed, 7 insertions(+), 12 deletions(-)
diff --git a/drivers/light
From: Konstantin Khlebnikov
Most architectures have fast path to access percpu for current cpu.
The required preempt_disable() is provided by part_stat_lock().
Signed-off-by: Konstantin Khlebnikov
[hch: rebased]
Signed-off-by: Christoph Hellwig
---
include/linux/part_stat.h | 2 +-
1 file cha
Hi Jens,
they series contains various improvement for block I/O accounting. The
first bunch of patches switch the bio based drivers to better accounting
helpers compared to the current mess. The end contains a fix and various
performanc improvements. Most of this comes from a series Konstantin
Remove these now unused functions.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
block/bio.c | 39 ---
include/linux/bio.h | 6 --
2 files changed, 45 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index 9c101a0572
Switch dm to use the nicer bio accounting helpers.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
drivers/nvdimm/blk.c | 6 --
drivers/nvdimm/btt.c | 6 --
drivers/nvdimm/nd.h | 19 ---
drivers/nvdimm/pmem.c | 6 --
4 files changed, 12
Switch dm to use the nicer bio accounting helpers.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
drivers/md/dm.c | 9 ++---
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f215b86664484..3f39fa1ac756e 100644
---
All callers are in blk-core.c, so move update_io_ticks over.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
block/bio.c | 16
block/blk-core.c | 15 +++
block/blk.h | 1 -
3 files changed, 15 insertions(+), 17 deletions(-)
diff -
We only need the stats lock (aka preempt_disable()) for updating the
states, not for looking up or dropping the hd_struct reference.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
block/blk-core.c | 5 +++--
block/blk-merge.c | 3 ++-
2 files changed, 5 insertions(+),
Switch bcache to use the nicer bio accounting helpers, and call the
routines where we also sample the start time to give coherent accounting
results.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
Acked-by: Coly Li
---
drivers/md/bcache/request.c | 18 --
1
Switch rsxx to use the nicer bio accounting helpers.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
drivers/block/rsxx/dev.c | 19 ++-
1 file changed, 2 insertions(+), 17 deletions(-)
diff --git a/drivers/block/rsxx/dev.c b/drivers/block/rsxx/dev.c
inde
From: Konstantin Khlebnikov
Move the non-"new_io" branch of blk_account_io_start() into separate
function. Fix merge accounting for discards (they were counted as write
merges).
The new blk_account_io_merge_bio() doesn't call update_io_ticks() unlike
blk_account_io_start(), as there is no reaso
From: Konstantin Khlebnikov
The RCU lock is required only in disk_map_sector_rcu() to lookup the
partition. After that request holds reference to related hd_struct.
Replace get_cpu() with preempt_disable() - returned cpu index is unused.
Signed-off-by: Konstantin Khlebnikov
[hch: rebased]
Sig
percpu variables have a perfectly fine working stub implementation
for UP kernels, so use that.
Signed-off-by: Christoph Hellwig
Reviewed-by: Konstantin Khlebnikov
---
block/blk.h | 2 +-
block/genhd.c | 12 +++--
block/partitions/core.c | 5 ++--
include/linux
Instead of counting the number of reserved zones in dmz_free_zone()
we should mark the zone as 'reserved' during allocation and simplify
dmz_free_zone().
Signed-off-by: Hannes Reinecke
Reviewed-by: Damien Le Moal
---
drivers/md/dm-zoned-metadata.c | 4 ++--
drivers/md/dm-zoned.h | 2 ++
Hi all,
here's the second version of my patchset to support multiple zoned
drives with dm-zoned.
This patchset:
- Converts the zone array to using xarray for better scalability
- Separates out shared structures into per-device structure
- Enforce drive-locality for allocating and reclaiming zones
Instead of having one reclaim workqueue for the entire set we should
be allocating a reclaim workqueue per device; that will reduce
contention and should boost performance for a multi-device setup.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-reclaim.c | 66 +++-
Allocate dm devices dynamically to allow for expansion to
several devices.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-target.c | 29 +++--
1 file changed, 19 insertions(+), 10 deletions(-)
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target
per-device reclaim should select zones on that device only.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c | 50 +-
drivers/md/dm-zoned-reclaim.c | 3 ++-
drivers/md/dm-zoned-target.c | 1 +
drivers/md/dm-zoned.h | 5 -
Signed-off-by: Hannes Reinecke
Reviewed-by: Damien Le Moal
---
drivers/md/dm-zoned-metadata.c | 4
1 file changed, 4 insertions(+)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 4a2e351365c5..ef1524d5928a 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b
The zones array is getting really large, and large arrays
tend to wreak havoc with the CPU caches.
So convert it to xarray to become more cache friendly.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c | 120 ++---
1 file changed, 88 insertio
Instead of just reporting the errno this patch adds some more
verbose debugging message in the reclaim path.
Signed-off-by: Hannes Reinecke
Reviewed-by: Damien Le Moal
---
drivers/md/dm-zoned-reclaim.c | 13 ++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/md
Remove the hard-coded limit of two devices and support an unlimited
number of additional zoned devices.
With that we need to increase the device-mapper version number to
3.0.0 as we've modified the interface.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c | 15 +++-
driver
Checking the tertiary superblock just consists of validating UUIDs,
crcs, and the generation number; it doesn't have contents which
would be required during the actual operation.
So we should be allocating a temporary superblock when checking
tertiary devices and avoid having to store it together w
Add a metadata pointer to struct dmz_dev and use it as argument
for blkdev_report_zones() instead of the metadata itself.
Signed-off-by: Hannes Reinecke
Reviewed-by: Damien Le Moal
---
drivers/md/dm-zoned-metadata.c | 14 +-
drivers/md/dm-zoned.h | 7 ---
2 files chang
When allocating a zone we should pass in an indicator on which
device the zone should be allocated; this increases performance
for a multi-device setup as then reclaim can allocate zones on
the device for which reclaim is running.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c
The secondary superblock must reside on the same device than the
primary superblock, so there's no need to re-calculate the device.
Signed-off-by: Hannes Reinecke
Reviewed-by: Damien Le Moal
---
drivers/md/dm-zoned-metadata.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --gi
Prefer full zones when selecting the next zone for reclaim.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c | 9 -
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index b89b3d3b9ec9..f161ef4e3d
Random and sequential zones should be part of the respective
device structure to make arbitration between devices possible.
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c | 139 +++--
drivers/md/dm-zoned-reclaim.c | 15 +++--
drivers/md/dm
Add a pointer to the containing device to struct dm_zone and
kill dmz_zone_to_dev().
Signed-off-by: Hannes Reinecke
---
drivers/md/dm-zoned-metadata.c | 39 ++-
drivers/md/dm-zoned-reclaim.c | 13 +
drivers/md/dm-zoned-target.c | 2 +-
drivers/
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