On Mon, 14 Oct 2013, Akira Hayakawa wrote:
> Hi, DM Guys
>
> I suppose I have finished the tasks to
> answer Mikulas's pointing outs.
> So, let me update the progress report.
>
> The code is updated now on my Github repo.
> Checkout the develop branch to avail
> the latest source code.
>
> Co
On Sun, 6 Oct 2013, Akira Hayakawa wrote:
> Mikulas,
>
> Thank you for your reviewing.
>
> I will reply to polling issue first.
> For the rest, I will reply later.
>
> > Polling for state
> > -
> >
> > Some of the kernel threads that you spawn poll for data in one-second
> >
Hi
I looked at dm-writeboost source code and here I'm sending the list of
problems I found:
Polling for state
-
Some of the kernel threads that you spawn poll for data in one-second
interval - see migrate_proc, modulator_proc, recorder_proc, sync_proc.
flush_proc correctly co
On Sat, 5 Oct 2013, Akira Hayakawa wrote:
> Mikulas,
>
> > nvidia binary driver, but it may happen in other parts of the kernel too.
> > The fact that it works in your setup doesn't mean that it is correct.
> You are right. I am convinced.
>
> As far as I looked around the kernel code,
> it s
On Fri, 4 Oct 2013, Akira Hayakawa wrote:
> Mikulas,
>
> Thanks for your pointing out.
>
> > The problem is that you are using workqueues the wrong way. You submit a
> > work item to a workqueue and the work item is active until the device is
> > unloaded.
> >
> > If you submit a work item
On Fri, 4 Oct 2013, Akira Hayakawa wrote:
> Hi, Mikulas,
>
> I am sorry to say that
> I don't have such machines to reproduce the problem.
>
> But agree with that I am dealing with workqueue subsystem
> in a little bit weird way.
> I should clean them up.
>
> For example,
> free_cache() routi
Hi
I tested dm-writeboost and I found these problems:
Performance problems:
I tested dm-writeboost with disk as backing device and ramdisk as cache
device. When I run mkfs.ext4 on the dm-writeboost device, it writes data
to the cache on the first time. However, on next mkfs.ext4 invocations,
On Tue, 1 Oct 2013, Joe Thornber wrote:
> > Alternatively, delaying them will stall the filesystem because it's
> > waiting for said REQ_FUA IO to complete. For example, journal writes
> > in XFS are extremely IO latency sensitive in workloads that have a
> > signifincant number of ordering cons
