From: Michal Hocko <mhocko@kernel.org>
To: David Rientjes <rientjes@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
Andrea Argangeli <andrea@kernel.org>,
Zi Yan <zi.yan@cs.rutgers.edu>,
Stefan Priebe - Profihost AG <s.priebe@profihost.ag>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/2] mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask
Date: Tue, 9 Oct 2018 14:36:35 +0200 [thread overview]
Message-ID: <20181009123635.GO8528@dhcp22.suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.21.1810041317010.16935@chino.kir.corp.google.com>
On Thu 04-10-18 13:17:52, David Rientjes wrote:
> On Wed, 26 Sep 2018, Kirill A. Shutemov wrote:
>
> > On Tue, Sep 25, 2018 at 02:03:26PM +0200, Michal Hocko wrote:
> > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > > index c3bc7e9c9a2a..c0bcede31930 100644
> > > --- a/mm/huge_memory.c
> > > +++ b/mm/huge_memory.c
> > > @@ -629,21 +629,40 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
> > > * available
> > > * never: never stall for any thp allocation
> > > */
> > > -static inline gfp_t alloc_hugepage_direct_gfpmask(struct vm_area_struct *vma)
> > > +static inline gfp_t alloc_hugepage_direct_gfpmask(struct vm_area_struct *vma, unsigned long addr)
> > > {
> > > const bool vma_madvised = !!(vma->vm_flags & VM_HUGEPAGE);
> > > + gfp_t this_node = 0;
> > > +
> > > +#ifdef CONFIG_NUMA
> > > + struct mempolicy *pol;
> > > + /*
> > > + * __GFP_THISNODE is used only when __GFP_DIRECT_RECLAIM is not
> > > + * specified, to express a general desire to stay on the current
> > > + * node for optimistic allocation attempts. If the defrag mode
> > > + * and/or madvise hint requires the direct reclaim then we prefer
> > > + * to fallback to other node rather than node reclaim because that
> > > + * can lead to excessive reclaim even though there is free memory
> > > + * on other nodes. We expect that NUMA preferences are specified
> > > + * by memory policies.
> > > + */
> > > + pol = get_vma_policy(vma, addr);
> > > + if (pol->mode != MPOL_BIND)
> > > + this_node = __GFP_THISNODE;
> > > + mpol_cond_put(pol);
> > > +#endif
> >
> > I'm not very good with NUMA policies. Could you explain in more details how
> > the code above is equivalent to the code below?
> >
>
> It breaks mbind() because new_page() is now using numa_node_id() to
> allocate migration targets for instead of using the mempolicy. I'm not
> sure that this patch was tested for mbind().
I am sorry but I do not follow, could you be more specific please?
MPOL_BIND should never get __GFP_THISNODE. What am I missing?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-10-09 12:36 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-25 12:03 [PATCH 0/2] thp nodereclaim fixes Michal Hocko
2018-09-25 12:03 ` [PATCH 1/2] mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings Michal Hocko
2018-09-25 12:20 ` Mel Gorman
2018-09-25 12:30 ` Michal Hocko
2018-10-04 20:16 ` David Rientjes
2018-10-04 21:10 ` Andrea Arcangeli
2018-10-04 23:05 ` David Rientjes
2018-10-06 3:19 ` Andrea Arcangeli
2018-10-05 7:38 ` Mel Gorman
2018-10-05 20:35 ` David Rientjes
2018-10-05 23:21 ` Andrea Arcangeli
2018-10-08 20:41 ` David Rientjes
2018-10-09 9:48 ` Mel Gorman
2018-10-09 12:27 ` Michal Hocko
2018-10-09 13:00 ` Mel Gorman
2018-10-09 14:25 ` Michal Hocko
2018-10-09 15:16 ` Mel Gorman
2018-10-09 23:03 ` Andrea Arcangeli
2018-10-10 21:19 ` David Rientjes
2018-10-15 22:30 ` David Rientjes
2018-10-15 22:44 ` Andrew Morton
2018-10-15 23:19 ` Andrea Arcangeli
2018-10-22 20:54 ` David Rientjes
2018-10-16 7:46 ` Mel Gorman
2018-10-16 22:37 ` Andrew Morton
2018-10-16 23:11 ` Andrea Arcangeli
2018-10-16 23:16 ` Andrew Morton
2018-10-17 7:08 ` Michal Hocko
2018-10-17 9:00 ` Mel Gorman
2018-10-22 21:04 ` David Rientjes
2018-10-23 1:27 ` Zi Yan
2018-10-28 21:45 ` David Rientjes
2018-10-23 7:57 ` Mel Gorman
2018-10-23 8:38 ` Mel Gorman
2018-10-15 22:57 ` Andrea Arcangeli
2018-10-22 20:45 ` David Rientjes
2018-10-09 22:17 ` David Rientjes
2018-10-09 22:51 ` Andrea Arcangeli
2018-10-10 7:54 ` Vlastimil Babka
2018-10-10 21:00 ` David Rientjes
2018-10-09 13:08 ` Vlastimil Babka
2018-10-09 22:21 ` Andrea Arcangeli
2018-10-29 5:17 ` Balbir Singh
2018-10-29 9:00 ` Michal Hocko
2018-10-29 9:42 ` Balbir Singh
2018-10-29 10:08 ` Michal Hocko
2018-10-29 10:56 ` Andrea Arcangeli
2018-09-25 12:03 ` [PATCH 2/2] mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask Michal Hocko
2018-09-26 13:30 ` Kirill A. Shutemov
2018-09-26 14:17 ` Michal Hocko
2018-09-26 14:22 ` Michal Hocko
2018-10-19 2:11 ` Andrew Morton
2018-10-19 8:06 ` Michal Hocko
2018-10-22 13:27 ` Vlastimil Babka
2018-10-24 23:17 ` Andrew Morton
2018-10-25 4:56 ` Vlastimil Babka
2018-10-25 16:14 ` Michal Hocko
2018-10-25 16:18 ` Andrew Morton
2018-10-25 16:45 ` Michal Hocko
2018-10-22 13:15 ` Vlastimil Babka
2018-10-22 13:30 ` Michal Hocko
2018-10-22 13:35 ` Vlastimil Babka
2018-10-22 13:46 ` Michal Hocko
2018-10-22 13:53 ` Vlastimil Babka
2018-10-04 20:17 ` David Rientjes
2018-10-04 21:49 ` Zi Yan
2018-10-09 12:36 ` Michal Hocko [this message]
2018-09-26 13:08 ` linux-mm@ archive on lore.kernel.org (Was: [PATCH 0/2] thp nodereclaim fixes) Kirill A. Shutemov
2018-09-26 13:14 ` Michal Hocko
2018-09-26 22:22 ` Andrew Morton
2018-09-26 23:08 ` Mel Gorman
2018-09-27 0:47 ` Konstantin Ryabitsev
2018-09-26 15:25 ` Konstantin Ryabitsev
2018-09-27 11:30 ` Kirill A. Shutemov
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