From: Joonsoo Kim <js1304@gmail.com>
To: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
David Hildenbrand <david@redhat.com>,
Oscar Salvador <osalvador@suse.de>,
Dan Williams <dan.j.williams@intel.com>,
Sasha Levin <sashal@kernel.org>,
Tyler Hicks <tyhicks@linux.microsoft.com>,
mike.kravetz@oracle.com, Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Peter Zijlstra <peterz@infradead.org>,
Mel Gorman <mgorman@suse.de>,
Matthew Wilcox <willy@infradead.org>,
David Rientjes <rientjes@google.com>,
John Hubbard <jhubbard@nvidia.com>
Subject: Re: [PATCH 6/6] mm/gup: migrate pinned pages out of movable zone
Date: Mon, 7 Dec 2020 16:13:36 +0900 [thread overview]
Message-ID: <20201207071335.GB10731@js1304-desktop> (raw)
In-Reply-To: <CA+CK2bDtmeyMgd7gkdbb+0hfm5rSow-Lc+FOrZM3tUZAOR+FRw@mail.gmail.com>
On Fri, Dec 04, 2020 at 12:43:29PM -0500, Pavel Tatashin wrote:
> On Thu, Dec 3, 2020 at 11:14 PM Joonsoo Kim <js1304@gmail.com> wrote:
> >
> > On Wed, Dec 02, 2020 at 12:23:30AM -0500, Pavel Tatashin wrote:
> > > We do not allocate pin pages in ZONE_MOVABLE, but if pages were already
> > > allocated before pinning they need to migrated to a different zone.
> > > Currently, we migrate movable CMA pages only. Generalize the function
> > > that migrates CMA pages to migrate all movable pages.
> > >
> > > Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> > > ---
> > > include/linux/migrate.h | 1 +
> > > include/trace/events/migrate.h | 3 +-
> > > mm/gup.c | 56 +++++++++++++---------------------
> > > 3 files changed, 24 insertions(+), 36 deletions(-)
> > >
> > > diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> > > index 0f8d1583fa8e..00bab23d1ee5 100644
> > > --- a/include/linux/migrate.h
> > > +++ b/include/linux/migrate.h
> > > @@ -27,6 +27,7 @@ enum migrate_reason {
> > > MR_MEMPOLICY_MBIND,
> > > MR_NUMA_MISPLACED,
> > > MR_CONTIG_RANGE,
> > > + MR_LONGTERM_PIN,
> > > MR_TYPES
> > > };
> > >
> > > diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
> > > index 4d434398d64d..363b54ce104c 100644
> > > --- a/include/trace/events/migrate.h
> > > +++ b/include/trace/events/migrate.h
> > > @@ -20,7 +20,8 @@
> > > EM( MR_SYSCALL, "syscall_or_cpuset") \
> > > EM( MR_MEMPOLICY_MBIND, "mempolicy_mbind") \
> > > EM( MR_NUMA_MISPLACED, "numa_misplaced") \
> > > - EMe(MR_CONTIG_RANGE, "contig_range")
> > > + EM( MR_CONTIG_RANGE, "contig_range") \
> > > + EMe(MR_LONGTERM_PIN, "longterm_pin")
> > >
> > > /*
> > > * First define the enums in the above macros to be exported to userspace
> > > diff --git a/mm/gup.c b/mm/gup.c
> > > index 724d8a65e1df..1d511f65f8a7 100644
> > > --- a/mm/gup.c
> > > +++ b/mm/gup.c
> > > @@ -1593,19 +1593,18 @@ static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
> > > }
> > > #endif
> > >
> > > -#ifdef CONFIG_CMA
> > > -static long check_and_migrate_cma_pages(struct mm_struct *mm,
> > > - unsigned long start,
> > > - unsigned long nr_pages,
> > > - struct page **pages,
> > > - struct vm_area_struct **vmas,
> > > - unsigned int gup_flags)
> > > +static long check_and_migrate_movable_pages(struct mm_struct *mm,
> > > + unsigned long start,
> > > + unsigned long nr_pages,
> > > + struct page **pages,
> > > + struct vm_area_struct **vmas,
> > > + unsigned int gup_flags)
> > > {
> > > unsigned long i;
> > > unsigned long step;
> > > bool drain_allow = true;
> > > bool migrate_allow = true;
> > > - LIST_HEAD(cma_page_list);
> > > + LIST_HEAD(page_list);
> > > long ret = nr_pages;
> > > struct migration_target_control mtc = {
> > > .nid = NUMA_NO_NODE,
> > > @@ -1623,13 +1622,12 @@ static long check_and_migrate_cma_pages(struct mm_struct *mm,
> > > */
> > > step = compound_nr(head) - (pages[i] - head);
> > > /*
> > > - * If we get a page from the CMA zone, since we are going to
> > > - * be pinning these entries, we might as well move them out
> > > - * of the CMA zone if possible.
> > > + * If we get a movable page, since we are going to be pinning
> > > + * these entries, try to move them out if possible.
> > > */
> > > - if (is_migrate_cma_page(head)) {
> > > + if (is_migrate_movable(get_pageblock_migratetype(head))) {
> >
> > is_migrate_movable() isn't a check for the ZONE. It's a check for the
> > MIGRATE_TYPE. MIGRATE_TYPE doesn't require hard guarantee for
> > migration, and, most of memory, including ZONE_NORMAL, is
> > MIGRATE_MOVABLE. With this code, long term gup would always fails due
> > to not enough memory. I think that correct change would be
> > "is_migrate_cma_page(hear) && zone == ZONE_MOVABLE".
>
> Good point. The above should be OR not AND.
>
> zone_idx(page_zone(head)) == ZONE_MOVABLE || is_migrate_cma_page(hear)
Yep!
Thanks.
next prev parent reply other threads:[~2020-12-07 7:13 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 5:23 [PATCH 0/6] prohibit pinning pages in ZONE_MOVABLE Pavel Tatashin
2020-12-02 5:23 ` [PATCH 1/6] mm/gup: perform check_dax_vmas only when FS_DAX is enabled Pavel Tatashin
2020-12-02 16:22 ` Ira Weiny
2020-12-02 18:15 ` Pavel Tatashin
2020-12-02 16:29 ` Jason Gunthorpe
2020-12-02 18:16 ` Pavel Tatashin
2020-12-03 7:59 ` John Hubbard
2020-12-03 14:52 ` Pavel Tatashin
2020-12-02 5:23 ` [PATCH 2/6] mm/gup: don't pin migrated cma pages in movable zone Pavel Tatashin
2020-12-02 16:31 ` David Hildenbrand
2020-12-02 18:17 ` Pavel Tatashin
2020-12-03 8:01 ` John Hubbard
2020-12-03 8:46 ` Michal Hocko
2020-12-03 14:58 ` Pavel Tatashin
2020-12-02 5:23 ` [PATCH 3/6] mm/gup: make __gup_longterm_locked common Pavel Tatashin
2020-12-02 16:31 ` Ira Weiny
2020-12-02 16:33 ` Ira Weiny
2020-12-02 18:19 ` Pavel Tatashin
2020-12-03 0:03 ` Pavel Tatashin
2020-12-03 8:03 ` John Hubbard
2020-12-03 15:02 ` Pavel Tatashin
2020-12-02 5:23 ` [PATCH 4/6] mm cma: rename PF_MEMALLOC_NOCMA to PF_MEMALLOC_NOMOVABLE Pavel Tatashin
2020-12-03 8:04 ` John Hubbard
2020-12-03 15:02 ` Pavel Tatashin
2020-12-03 8:57 ` Michal Hocko
2020-12-03 15:02 ` Pavel Tatashin
2020-12-02 5:23 ` [PATCH 5/6] mm: honor PF_MEMALLOC_NOMOVABLE for all allocations Pavel Tatashin
2020-12-03 8:17 ` John Hubbard
2020-12-03 15:06 ` Pavel Tatashin
2020-12-03 16:51 ` John Hubbard
2020-12-03 9:17 ` Michal Hocko
2020-12-03 15:15 ` Pavel Tatashin
2020-12-04 8:43 ` Michal Hocko
2020-12-04 8:54 ` Michal Hocko
2020-12-04 16:07 ` Pavel Tatashin
2020-12-02 5:23 ` [PATCH 6/6] mm/gup: migrate pinned pages out of movable zone Pavel Tatashin
2020-12-02 16:35 ` Jason Gunthorpe
2020-12-03 0:19 ` Pavel Tatashin
2020-12-03 1:08 ` Jason Gunthorpe
2020-12-03 1:34 ` Pavel Tatashin
2020-12-03 14:17 ` Jason Gunthorpe
2020-12-03 16:40 ` Pavel Tatashin
2020-12-03 16:59 ` Jason Gunthorpe
2020-12-03 17:14 ` Pavel Tatashin
2020-12-03 19:15 ` Pavel Tatashin
2020-12-03 19:36 ` Jason Gunthorpe
2020-12-04 16:24 ` Pavel Tatashin
2020-12-04 17:06 ` Jason Gunthorpe
2020-12-04 20:05 ` Daniel Jordan
2020-12-04 20:16 ` Pavel Tatashin
2020-12-08 2:27 ` Daniel Jordan
2020-12-04 20:52 ` Jason Gunthorpe
2020-12-08 2:48 ` Daniel Jordan
2020-12-08 13:24 ` Jason Gunthorpe
2020-12-03 8:22 ` John Hubbard
2020-12-03 15:55 ` Pavel Tatashin
2020-12-04 4:13 ` Joonsoo Kim
2020-12-04 17:43 ` Pavel Tatashin
2020-12-07 7:13 ` Joonsoo Kim [this message]
2020-12-04 4:02 ` [PATCH 0/6] prohibit pinning pages in ZONE_MOVABLE Joonsoo Kim
2020-12-04 15:55 ` Pavel Tatashin
2020-12-04 16:10 ` Jason Gunthorpe
2020-12-04 17:50 ` Pavel Tatashin
2020-12-04 18:01 ` David Hildenbrand
2020-12-04 18:10 ` Pavel Tatashin
2020-12-07 7:12 ` Joonsoo Kim
2020-12-07 12:13 ` Michal Hocko
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