Re: Hugepage program taking forever to exit

[Yu Zhao <yuzhao@google.com>]

On Wed, Sep 11, 2024 at 7:22 AM Jens Axboe <axboe@kernel.dk> wrote:
>
> On 9/10/24 9:42 PM, Andrew Morton wrote:
> > On Tue, 10 Sep 2024 17:08:30 -0600 Jens Axboe <axboe@kernel.dk> wrote:
> >
> >>> Fixes are in git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-stable
> >>>
> >>> c2a967f6ab0e mm/hugetlb_vmemmap: don't synchronize_rcu() without HVO
> >>> c0f398c3b2cf mm/hugetlb_vmemmap: batch HVO work when demoting
> >>>
> >>> Additional improvements from mm-stable that may or may not help your test case:
> >>>
> >>> e98337d11bbd mm/contig_alloc: support __GFP_COMP
> >>> 463586e9ff39 mm/cma: add cma_{alloc,free}_folio()
> >>> cf54f310d0d3 mm/hugetlb: use __GFP_COMP for gigantic folios
> >>
> >> I didn't pick patches, just pulled all of mm-stable - yep that fixes it
> >> for me, no longer spending 60+% of the runtime during exit. I trust
> >> these are heading to stable?
> >
> > None of these are tagged for -stable backporting.  We can later request
> > a backport without the cc:stable tag, although narrowing down the
> > required patches would be good.
>
> These two:
>
> c0f398c3b2cf mm/hugetlb_vmemmap: batch HVO work when demoting

This has the stable tag.

> c2a967f6ab0e mm/hugetlb_vmemmap: don't synchronize_rcu() without HVO

This one doesn't -- I was hoping it could make into 6.10-rc but that
didn't happen. Is it still possible to add the stable tag? If not,
I'll follow up on sending the backport.