When migrating a transparent hugepage, migrate_misplaced_transhuge_page
guards itself against a concurrent fastgup of the page by checking that
the page count is equal to 2 before and after installing the new pmd.
If the page count changes, then the pmd is reverted back to the original
entry, howe
On Tue, Jun 06, 2017 at 06:58:36PM +0100, Will Deacon wrote:
> When migrating a transparent hugepage, migrate_misplaced_transhuge_page
> guards itself against a concurrent fastgup of the page by checking that
> the page count is equal to 2 before and after installing the new pmd.
>
> If the page c
On 06/06/2017 07:58 PM, Will Deacon wrote:
> When migrating a transparent hugepage, migrate_misplaced_transhuge_page
> guards itself against a concurrent fastgup of the page by checking that
> the page count is equal to 2 before and after installing the new pmd.
>
> If the page count changes, then
On Thu, Jun 08, 2017 at 12:52:07PM +0200, Vlastimil Babka wrote:
> On 06/06/2017 07:58 PM, Will Deacon wrote:
> > When migrating a transparent hugepage, migrate_misplaced_transhuge_page
> > guards itself against a concurrent fastgup of the page by checking that
> > the page count is equal to 2 befo
On 2017/6/8 20:07, Will Deacon wrote:
> On Thu, Jun 08, 2017 at 12:52:07PM +0200, Vlastimil Babka wrote:
>> On 06/06/2017 07:58 PM, Will Deacon wrote:
>>> When migrating a transparent hugepage, migrate_misplaced_transhuge_page
>>> guards itself against a concurrent fastgup of the page by checking t
On 2017/6/8 20:07, Will Deacon wrote:
> On Thu, Jun 08, 2017 at 12:52:07PM +0200, Vlastimil Babka wrote:
>> On 06/06/2017 07:58 PM, Will Deacon wrote:
>>> When migrating a transparent hugepage, migrate_misplaced_transhuge_page
>>> guards itself against a concurrent fastgup of the page by checking t
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