On 2017/03/22 12:30PM, Matthew Wilcox wrote:
> On Wed, Mar 22, 2017 at 06:18:05AM -0700, Matthew Wilcox wrote:
> > There's one other potential user I've been wondering about, which are the
> > various console drivers. They use 'memsetw' to blank the entire console
> > or lines of the console when
On Wed, Mar 22, 2017 at 06:18:05AM -0700, Matthew Wilcox wrote:
> There's one other potential user I've been wondering about, which are the
> various console drivers. They use 'memsetw' to blank the entire console
> or lines of the console when scrolling, but the only architecture which
> ever bot
On Wed, Mar 22, 2017 at 08:26:12AM +1100, Benjamin Herrenschmidt wrote:
> On Tue, 2017-03-21 at 06:29 -0700, Matthew Wilcox wrote:
> >
> > Well, those are the generic versions in the first patch:
> >
> > http://git.infradead.org/users/willy/linux-dax.git/commitdiff/538b977
> > 6ac925199969bd5af4e
On Tue, 2017-03-21 at 06:29 -0700, Matthew Wilcox wrote:
>
> Well, those are the generic versions in the first patch:
>
> http://git.infradead.org/users/willy/linux-dax.git/commitdiff/538b977
> 6ac925199969bd5af4e994da776d461e7
>
> so if those are good enough for you guys, there's no need for yo
On Tue, Mar 21, 2017 at 06:29:10AM -0700, Matthew Wilcox wrote:
> > Unrolling the loop could help a bit on old powerpc32s that don't have branch
> > units, but on those processors the main driver is the time spent to do the
> > effective write to memory, and the operations necessary to unroll the l
On Tue, Mar 21, 2017 at 01:23:36PM +0100, Christophe LEROY wrote:
> > It doesn't look free for you as you only store one register each time
> > around the loop in the 32-bit memset implementation:
> >
> > 1: stwur4,4(r6)
> > bdnz1b
> >
> > (wouldn't you get better performance
Hi Matthew
Le 20/03/2017 à 22:14, Matthew Wilcox a écrit :
I recently introduced memset32() / memset64(). I've done implementations
for x86 & ARM; akpm has agreed to take the patchset through his tree.
Do you fancy doing a powerpc version? Minchan Kim got a 7% performance
increase with zram fr
On Mon, 2017-03-20 at 14:14 -0700, Matthew Wilcox wrote:
> I recently introduced memset32() / memset64(). I've done implementations
> for x86 & ARM; akpm has agreed to take the patchset through his tree.
> Do you fancy doing a powerpc version? Minchan Kim got a 7% performance
> increase with zram
I recently introduced memset32() / memset64(). I've done implementations
for x86 & ARM; akpm has agreed to take the patchset through his tree.
Do you fancy doing a powerpc version? Minchan Kim got a 7% performance
increase with zram from switching to the optimised version on x86.
Here's the deve
