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SubjectRe: [PATCH v2] mm/page_alloc: fix watchdog soft lockups during set_zone_contiguous()
On Fri 17-04-20 15:12:47, Andrew Morton wrote:
> On Thu, 16 Apr 2020 09:34:17 +0200 David Hildenbrand <david@redhat.com> wrote:
>
> > Without CONFIG_PREEMPT, it can happen that we get soft lockups detected,
> > e.g., while booting up.
> >
> > ...
> >
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -1607,6 +1607,7 @@ void set_zone_contiguous(struct zone *zone)
> > if (!__pageblock_pfn_to_page(block_start_pfn,
> > block_end_pfn, zone))
> > return;
> > + cond_resched();
> > }
> >
> > /* We confirm that there is no hole */
>
> I added cc:stable to this one. Please let me know if that wasn't a
> good idea.

Really large memory setups tend to run on distribution kernels so
backporting to old kernels doesn't really harm.
--
Michal Hocko
SUSE Labs

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