On 2017-11-16 09:06, Qu Wenruo wrote:
On 2017年11月16日 20:33, Zdenek Kabelac wrote:
Dne 16.11.2017 v 11:04 Qu Wenruo napsal(a):
On 2017年11月16日 17:43, Zdenek Kabelac wrote:
Dne 16.11.2017 v 09:08 Qu Wenruo napsal(a):
[What we have]
The nearest infrastructure I found in kernel is
bio_int
On Thu, Nov 16, 2017 at 02:28:15PM -0700, Ross Zwisler wrote:
> On Thu, Oct 26, 2017 at 08:56:38AM +1100, Dave Chinner wrote:
> > Perhaps stat -c %b $SCRATCH_MNT/test ?
>
> Maybe, but doesn't the output of 'stat -c %b' depend on the block size the
> filesystem is using? I think to use stat I'd ha
On Thu, Oct 26, 2017 at 08:56:38AM +1100, Dave Chinner wrote:
> On Wed, Oct 25, 2017 at 02:47:04PM -0600, Ross Zwisler wrote:
> > Add a test that exercises DAX's new MAP_SYNC flag.
> >
> > This test creates a file and writes to it via an mmap(), but never syncs
> > via fsync/msync. This process i
On 2017年11月17日 06:32, Chris Murphy wrote:
> On Thu, Nov 16, 2017 at 3:04 AM, Qu Wenruo wrote:
>
>> For example, if we use the following device mapper layout:
>>
>> FS (can be any fs with metadata csum)
>> |
>> dm-integrity
>> |
>>
On Thu, Nov 16, 2017 at 6:22 PM, Qu Wenruo wrote:
>
>
> On 2017年11月17日 06:32, Chris Murphy wrote:
>
>> It's good the file system can stay alive, but data is the much
>> bigger target in terms of percent space on the physical media,
>
> It's also true.
> (Although working on btrfs sometimes makes m
On 2017-11-16 20:30, Qu Wenruo wrote:
On 2017年11月17日 00:47, Austin S. Hemmelgarn wrote:
This is at least less complicated than dm-integrity.
Just a new hook for READ bio. And it can start from easy part.
Like starting from dm-raid1 and other fs support.
It's less complicated for end users
On Thu, Nov 16, 2017 at 6:54 PM, Chris Murphy wrote:
> The user doesn't have to setup dm-verity to get this.
Or dm-integrity, rather.
--
Chris Murphy
--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
On Thu, Oct 26, 2017 at 07:59:39AM +0300, Amir Goldstein wrote:
> On Wed, Oct 25, 2017 at 11:47 PM, Ross Zwisler
> wrote:
> > Add a test that exercises DAX's new MAP_SYNC flag.
> >
> > This test creates a file and writes to it via an mmap(), but never syncs
> > via fsync/msync. This process is tr
On 2017年11月17日 00:47, Austin S. Hemmelgarn wrote:
>>
>> This is at least less complicated than dm-integrity.
>>
>> Just a new hook for READ bio. And it can start from easy part.
>> Like starting from dm-raid1 and other fs support.
> It's less complicated for end users (in theory, but cryptsetup
On Thu, Nov 16, 2017 at 3:04 AM, Qu Wenruo wrote:
> For example, if we use the following device mapper layout:
>
> FS (can be any fs with metadata csum)
> |
> dm-integrity
> |
> dm-raid1
>/ \
> disk1 di
Hello Guan,
> On 2017/11/18 8:11, Martin Wilck wrote:
> > The log standard deviation can be calculated much more simply
> > by realizing
> >
> >sum_n (x_i - avg(x))^2 == sum_n x_i^2 - n * avg(x)^2
> >
>
> I derive the equation:
> sum_n {(x_i - avg(x))^2} = sum_n{x_i^2 -2*x_i*avg(x) + avg(x
Hi Guan,
while staring at this code the other day, I realized another possible
issue with your latency prioritizer.
It will cause significant IO to every path of a map during multipath /
multipathd startup. If any paths really have latencies as long as your
patch considers (up to 100s), or worse
On Sun, Jun 18, 2017 at 5:36 PM, NeilBrown wrote:
> On Sun, Jun 18 2017, Jens Axboe wrote:
>
>> On Sun, Jun 18 2017, NeilBrown wrote:
>>> This is a resend of my series of patches working
>>> towards removing the bioset work queues.
>>>
>>> This set is based on for-4.13/block.
>>>
>>> It incorporat
DM appears to be the only block driver that doesn't lean on the block
core's bio splitting. My hope is to fix that but in the meantime it
doesn't make sense for a device that doesn't need blk_queue_split() to
go through the associated work.
Signed-off-by: Mike Snitzer
---
block/blk-merge.c | 3
This function should return 1 on success, as the other sysfs_get_XXX
functions. The callers actually expect this - therefore timeout values
from sysfs are never used.
Signed-off-by: Martin Wilck
---
libmultipath/discovery.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libm
ALUA is supported in some storage devices, but usually it's disabled by default.
Cc: Christophe Varoqui
Cc: device-mapper development
Signed-off-by: Xose Vazquez Perez
---
README.alua | 14 ++
1 file changed, 14 insertions(+)
create mode 100644 README.alua
diff --git a/README.alu
On Sun, Nov 19, 2017 at 9:00 PM, Joseph Qi wrote:
> From: Joseph Qi
>
> dm device set QUEUE_FLAG_NONROT in resume, which is after register
> queue. That is to mean, the previous initialization in
> blk_throtl_register_queue is wrong in this case.
> Fix it by checking and then updating the info du
On Mon, Nov 20, 2017 at 04:02:03PM -0500, Mike Snitzer wrote:
> On Sun, Nov 19, 2017 at 9:00 PM, Joseph Qi wrote:
> > From: Joseph Qi
> >
> > dm device set QUEUE_FLAG_NONROT in resume, which is after register
> > queue. That is to mean, the previous initialization in
> > blk_throtl_register_queue
On Mon, Nov 20 2017, Mike Snitzer wrote:
> On Sun, Jun 18, 2017 at 5:36 PM, NeilBrown wrote:
>> On Sun, Jun 18 2017, Jens Axboe wrote:
>>
>>> On Sun, Jun 18 2017, NeilBrown wrote:
This is a resend of my series of patches working
towards removing the bioset work queues.
This se
On Mon, Nov 20 2017 at 4:23pm -0500,
Shaohua Li wrote:
> On Mon, Nov 20, 2017 at 04:02:03PM -0500, Mike Snitzer wrote:
> > On Sun, Nov 19, 2017 at 9:00 PM, Joseph Qi wrote:
> > > From: Joseph Qi
> > >
> > > dm device set QUEUE_FLAG_NONROT in resume, which is after register
> > > queue. That is
On Mon, Nov 20 2017 at 7:34pm -0500,
NeilBrown wrote:
> On Mon, Nov 20 2017, Mike Snitzer wrote:
>
> > On Sun, Jun 18, 2017 at 5:36 PM, NeilBrown wrote:
> >> On Sun, Jun 18 2017, Jens Axboe wrote:
> >>
> >>> On Sun, Jun 18 2017, NeilBrown wrote:
> This is a resend of my series of patches
On Thu, Nov 16, 2017 at 03:32:05PM -0700, Chris Murphy wrote:
>
> XFS by default does metadata csums. But ext4 doesn't use it for either
> metadata or the journal by default still, it is still optional. So for
> now it mainly benefits XFS.
Metadata checksums are enabled by default in the version
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