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
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
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
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
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
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
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
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
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
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
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
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,
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 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
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 --
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 ++--
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]
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