From: Christophe Leroy
> Sent: 07 September 2020 05:44
...
> If you are talking about the tests around the set_fs series from
> Christoph, I identified that the degradation was linked to
> CONFIG_STACKPROTECTOR_STRONG being selected by default, which provides
> unreliable results from one patch to
On Mon, Sep 07, 2020 at 08:50:53AM +0200, Rasmus Villemoes wrote:
>
> Actually, while you're micro-optimizing it, AFAIK VFS already handles
> count==0,
It doesn't.
On 07/09/2020 08.20, Christoph Hellwig wrote:
> On Mon, Sep 07, 2020 at 12:34:37AM +0200, Rasmus Villemoes wrote:
>> On 03/09/2020 17.59, Christoph Hellwig wrote:
>
>>> +static ssize_t read_zero(struct file *file, char __user *buf,
>>> +size_t count, loff_t *ppos)
>>> +{
>>> +
On Mon, Sep 07, 2020 at 12:34:37AM +0200, Rasmus Villemoes wrote:
> On 03/09/2020 17.59, Christoph Hellwig wrote:
> > Christophe reported a major speedup due to avoiding the iov_iter
> > overhead, so just add this trivial function. Note that /dev/zero
> > already implements both an iter and non-it
Le 06/09/2020 à 22:52, David Laight a écrit :
From: Christophe Leroy
Sent: 06 September 2020 19:36
Hi,
Le 06/09/2020 à 20:21, Pavel Machek a écrit :
Hi!
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function. Note that /dev/zero
alrea
On 03/09/2020 17.59, Christoph Hellwig wrote:
> Christophe reported a major speedup due to avoiding the iov_iter
> overhead, so just add this trivial function. Note that /dev/zero
> already implements both an iter and non-iter writes so this just
> makes it more symmetric.
>
> Christophe Leroy
From: Christophe Leroy
> Sent: 06 September 2020 19:36
> Hi,
>
> Le 06/09/2020 à 20:21, Pavel Machek a écrit :
> > Hi!
> >
> Christophe reported a major speedup due to avoiding the iov_iter
> overhead, so just add this trivial function. Note that /dev/zero
> already implements both
On Sun, Sep 06, 2020 at 08:38:20PM +0200, Pavel Machek wrote:
> On Sun 2020-09-06 20:35:38, Christophe Leroy wrote:
> > Hi,
> >
> > Le 06/09/2020 à 20:21, Pavel Machek a écrit :
> > >Hi!
> > >
> > Christophe reported a major speedup due to avoiding the iov_iter
> > overhead, so just add th
Le 06/09/2020 à 20:38, Pavel Machek a écrit :
On Sun 2020-09-06 20:35:38, Christophe Leroy wrote:
Hi,
Le 06/09/2020 à 20:21, Pavel Machek a écrit :
Hi!
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function. Note that /dev/zero
alread
On Sun 2020-09-06 20:35:38, Christophe Leroy wrote:
> Hi,
>
> Le 06/09/2020 à 20:21, Pavel Machek a écrit :
> >Hi!
> >
> Christophe reported a major speedup due to avoiding the iov_iter
> overhead, so just add this trivial function. Note that /dev/zero
> already implements both an ite
Hi,
Le 06/09/2020 à 20:21, Pavel Machek a écrit :
Hi!
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function. Note that /dev/zero
already implements both an iter and non-iter writes so this just
makes it more symmetric.
Christophe Leroy
Hi!
> > > Christophe reported a major speedup due to avoiding the iov_iter
> > > overhead, so just add this trivial function. Note that /dev/zero
> > > already implements both an iter and non-iter writes so this just
> > > makes it more symmetric.
> > >
> > > Christophe Leroy
> > > Signed-off-by
From: Christophe Leroy
>
>
> Le 03/09/2020 à 17:59, Christoph Hellwig a écrit :
> > Christophe reported a major speedup due to avoiding the iov_iter
> > overhead, so just add this trivial function. Note that /dev/zero
> > already implements both an iter and non-iter writes so this just
> > makes
On Thu, Sep 03, 2020 at 07:51:07PM +0200, Christophe Leroy wrote:
>
>
> Le 03/09/2020 à 17:59, Christoph Hellwig a écrit :
> > Christophe reported a major speedup due to avoiding the iov_iter
> > overhead, so just add this trivial function. Note that /dev/zero
> > already implements both an iter
Le 03/09/2020 à 17:59, Christoph Hellwig a écrit :
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function. Note that /dev/zero
already implements both an iter and non-iter writes so this just
makes it more symmetric.
Christophe Leroy
Sig
Le 03/09/2020 à 17:59, Christoph Hellwig a écrit :
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function. Note that /dev/zero
already implements both an iter and non-iter writes so this just
makes it more symmetric.
Christophe Leroy
Sig
Christophe reported a major speedup due to avoiding the iov_iter
overhead, so just add this trivial function. Note that /dev/zero
already implements both an iter and non-iter writes so this just
makes it more symmetric.
Christophe Leroy
Signed-off-by: Christoph Hellwig
---
drivers/char/mem.c |
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