On Fri, 2019-10-04 at 13:28 +0200, Peter Zijlstra wrote:
> > Could you please explain it?
> > I mean, why this breaks tmpfs-thp?
> > Also, why mm_cpumask() is also broken?
>
> Because shared pages are not bound by a mm; or does it not share the thp
> state between mappings?
By what I could
On Sat, Oct 05, 2019 at 02:05:29PM +0530, Aneesh Kumar K.V wrote:
> MADV_DONTNEED has caused us multiple issues due to the fact that it can run
> in parallel to page fault. I am not sure whether we have a known/noticeable
> performance gain in allowing that with mmap_sem held in read mode.
Yes we
On 10/3/19 5:21 PM, Peter Zijlstra wrote:
On Thu, Oct 03, 2019 at 09:11:45AM +0200, Peter Zijlstra wrote:
On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras wrote:
And I still think all that wrong, you really shouldn't need to wait on
munmap().
I do have a patch that does
On Thu, Oct 03, 2019 at 06:24:07PM -0300, Leonardo Bras wrote:
> Hello Peter, thanks for the feedback!
>
> On Thu, 2019-10-03 at 13:51 +0200, Peter Zijlstra wrote:
> > On Thu, Oct 03, 2019 at 09:11:45AM +0200, Peter Zijlstra wrote:
> > > On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras
On Thu, Oct 03, 2019 at 01:40:38PM -0700, John Hubbard wrote:
> On 10/3/19 4:51 AM, Peter Zijlstra wrote:
> > On Thu, Oct 03, 2019 at 09:11:45AM +0200, Peter Zijlstra wrote:
> >> On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras wrote:
> ...
> >
> > I'm still really confused about this
Hello Peter, thanks for the feedback!
On Thu, 2019-10-03 at 13:51 +0200, Peter Zijlstra wrote:
> On Thu, Oct 03, 2019 at 09:11:45AM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras wrote:
> > > diff --git a/include/asm-generic/pgtable.h
On 10/3/19 4:51 AM, Peter Zijlstra wrote:
> On Thu, Oct 03, 2019 at 09:11:45AM +0200, Peter Zijlstra wrote:
>> On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras wrote:
...
>
> I'm still really confused about this barrier. It just doesn't make
> sense.
>
> If an interrupt happens before the
On Thu, Oct 03, 2019 at 09:11:45AM +0200, Peter Zijlstra wrote:
> On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras wrote:
> > diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> > index 818691846c90..3043ea9812d5 100644
> > --- a/include/asm-generic/pgtable.h
> >
On Wed, Oct 02, 2019 at 10:33:15PM -0300, Leonardo Bras wrote:
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 818691846c90..3043ea9812d5 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -1171,6 +1171,64 @@ static inline
It's necessary to monitor lockless pagetable walks, in order to avoid doing
THP splitting/collapsing during them.
Some methods rely on irq enable/disable, but that can be slow on
cases with a lot of cpus are used for the process, given all these cpus
have to run a IPI.
In order to speedup some
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