On 07/31, Song Liu wrote:
>
> > On Jul 31, 2019, at 8:18 AM, Oleg Nesterov wrote:
> >
> > Now, I don't understand why do we need pmd_trans_unstable() after
> > split_huge_pmd(huge-zero-pmd), but whatever reason we have, why can't we
> > unify both cases?
> >
> > IOW, could you explain why the
> On Jul 31, 2019, at 8:18 AM, Oleg Nesterov wrote:
>
> On 07/30, Song Liu wrote:
>>
>>
>>> On Jul 30, 2019, at 9:11 AM, Oleg Nesterov wrote:
>>>
>>> So after the next patch we have a single user of FOLL_SPLIT_PMD (uprobes)
>>> and a single user of FOLL_SPLIT:
On 07/30, Song Liu wrote:
>
>
> > On Jul 30, 2019, at 9:11 AM, Oleg Nesterov wrote:
> >
> > So after the next patch we have a single user of FOLL_SPLIT_PMD (uprobes)
> > and a single user of FOLL_SPLIT: arch/s390/mm/gmap.c:thp_split_mm().
> >
> > Hmm.
>
> I think this is what we want. :)
We? I
> On Jul 30, 2019, at 9:11 AM, Oleg Nesterov wrote:
>
> I don't understand this code, so I can't review, but.
>
> On 07/29, Song Liu wrote:
>>
>> This patches introduces a new foll_flag: FOLL_SPLIT_PMD. As the name says
>> FOLL_SPLIT_PMD splits huge pmd for given mm_struct, the underlining
I don't understand this code, so I can't review, but.
On 07/29, Song Liu wrote:
>
> This patches introduces a new foll_flag: FOLL_SPLIT_PMD. As the name says
> FOLL_SPLIT_PMD splits huge pmd for given mm_struct, the underlining huge
> page stays as-is.
>
> FOLL_SPLIT_PMD is useful for cases where
This patches introduces a new foll_flag: FOLL_SPLIT_PMD. As the name says
FOLL_SPLIT_PMD splits huge pmd for given mm_struct, the underlining huge
page stays as-is.
FOLL_SPLIT_PMD is useful for cases where we need to use regular pages,
but would switch back to huge page and huge pmd on. One of
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