On Mon, Jun 28, 2021 at 10:48:05AM -0400, Dave Jones wrote: > On Mon, Jun 28, 2021 at 12:53:23PM +0100, Mel Gorman wrote: > > > > This made it into 5.13 final, and completely breaks NFSD for me (Serving tcp v3 mounts). > > > Existing mounts on clients hang, as do new mounts from new clients. > > > Rebooting the server back to rc7 everything recovers. Bisect lands on > > > this commit. > > > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > > index ef2265f86b91..04220581579c 100644 > > --- a/mm/page_alloc.c > > +++ b/mm/page_alloc.c > > @@ -5058,7 +5058,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid, > > > > /* Already populated array? */ > > if (unlikely(page_array && nr_pages - nr_populated == 0)) > > - return 0; > > + return nr_populated; > > Yep, this works. > Thanks Dave, it passed a dbench test over NFS locally as well so I sent a proper version of the patch. Hopefully it'll be picked up relatively quickly and appear in a 5.13.1 release. -- Mel Gorman SUSE Labs
