On Fri, May 22, 2020 at 09:01:17AM -0400, Mikulas Patocka wrote:
>
>
> On Fri, 22 May 2020, Aneesh Kumar K.V wrote:
>
> > On 5/22/20 3:01 PM, Michal Suchánek wrote:
> > > On Thu, May 21, 2020 at 02:52:30PM -0400, Mikulas Patocka wrote:
> > > >
> > > >
> > > > On Thu, 21 May 2020, Dan
On Fri, 22 May 2020, Aneesh Kumar K.V wrote:
> On 5/22/20 3:01 PM, Michal Suchánek wrote:
> > On Thu, May 21, 2020 at 02:52:30PM -0400, Mikulas Patocka wrote:
> > >
> > >
> > > On Thu, 21 May 2020, Dan Williams wrote:
> > >
> > > > On Thu, May 21, 2020 at 10:03 AM Aneesh Kumar K.V
> > > >
On 5/22/20 3:01 PM, Michal Suchánek wrote:
On Thu, May 21, 2020 at 02:52:30PM -0400, Mikulas Patocka wrote:
On Thu, 21 May 2020, Dan Williams wrote:
On Thu, May 21, 2020 at 10:03 AM Aneesh Kumar K.V
wrote:
Moving on to the patch itself--Aneesh, have you audited other persistent
memory
On Thu, May 21, 2020 at 02:52:30PM -0400, Mikulas Patocka wrote:
>
>
> On Thu, 21 May 2020, Dan Williams wrote:
>
> > On Thu, May 21, 2020 at 10:03 AM Aneesh Kumar K.V
> > wrote:
> > >
> > > > Moving on to the patch itself--Aneesh, have you audited other persistent
> > > > memory users in the
On Thu, 21 May 2020, Dan Williams wrote:
> On Thu, May 21, 2020 at 10:03 AM Aneesh Kumar K.V
> wrote:
> >
> > > Moving on to the patch itself--Aneesh, have you audited other persistent
> > > memory users in the kernel? For example, drivers/md/dm-writecache.c does
> > > this:
> > >
> > >
On Thu, May 21, 2020 at 7:39 AM Jeff Moyer wrote:
>
> Dan Williams writes:
>
> >> But I agree with your concern that if we have older kernel/applications
> >> that continue to use `dcbf` on future hardware we will end up
> >> having issues w.r.t powerfail consistency. The plan is what you
On Thu, May 21, 2020 at 10:03 AM Aneesh Kumar K.V
wrote:
>
> On 5/21/20 8:08 PM, Jeff Moyer wrote:
> > Dan Williams writes:
> >
> >>> But I agree with your concern that if we have older kernel/applications
> >>> that continue to use `dcbf` on future hardware we will end up
> >>> having issues
On 5/21/20 8:08 PM, Jeff Moyer wrote:
Dan Williams writes:
But I agree with your concern that if we have older kernel/applications
that continue to use `dcbf` on future hardware we will end up
having issues w.r.t powerfail consistency. The plan is what you outlined
above as tighter ecosystem
Dan Williams writes:
>> But I agree with your concern that if we have older kernel/applications
>> that continue to use `dcbf` on future hardware we will end up
>> having issues w.r.t powerfail consistency. The plan is what you outlined
>> above as tighter ecosystem control. Considering we don't
Dan Williams writes:
> On Tue, May 19, 2020 at 6:53 AM Aneesh Kumar K.V
> wrote:
>>
>> Dan Williams writes:
>>
>> > On Mon, May 18, 2020 at 10:30 PM Aneesh Kumar K.V
>> > wrote:
>>
>> ...
>>
>> >> Applications using new instructions will behave as expected when running
>> >> on P8 and P9.
On Tue, May 19, 2020 at 6:53 AM Aneesh Kumar K.V
wrote:
>
> Dan Williams writes:
>
> > On Mon, May 18, 2020 at 10:30 PM Aneesh Kumar K.V
> > wrote:
>
> ...
>
> >> Applications using new instructions will behave as expected when running
> >> on P8 and P9. Only future hardware will differentiate
Dan Williams writes:
> On Mon, May 18, 2020 at 10:30 PM Aneesh Kumar K.V
> wrote:
...
>> Applications using new instructions will behave as expected when running
>> on P8 and P9. Only future hardware will differentiate between 'dcbf' and
>> 'dcbfps'
>
> Right, this is the problem.
On Mon, May 18, 2020 at 10:30 PM Aneesh Kumar K.V
wrote:
>
>
> Hi Dan,
>
> Apologies for the delay in response. I was waiting for feedback from
> hardware team before responding to this email.
>
>
> Dan Williams writes:
>
> > On Tue, May 12, 2020 at 8:47 PM Aneesh Kumar K.V
> > wrote:
> >>
> >>
Hi Dan,
Apologies for the delay in response. I was waiting for feedback from
hardware team before responding to this email.
Dan Williams writes:
> On Tue, May 12, 2020 at 8:47 PM Aneesh Kumar K.V
> wrote:
>>
>> Architectures like ppc64 provide persistent memory specific barriers
>> that
On Tue, May 12, 2020 at 8:47 PM Aneesh Kumar K.V
wrote:
>
> Architectures like ppc64 provide persistent memory specific barriers
> that will ensure that all stores for which the modifications are
> written to persistent storage by preceding dcbfps and dcbstps
> instructions have updated
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