From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: Ira Weiny <ira.weiny@intel.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>,
Joonsoo Kim <iamjoonsoo.kim@lge.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 3/6] mm/gup: make __gup_longterm_locked common
Date: Wed, 2 Dec 2020 19:03:04 -0500 [thread overview]
Message-ID: <CA+CK2bDPje=3gqUW4rhdZnxhsUUvbo2hx9v0Q5xqMh_NRwaixA@mail.gmail.com> (raw)
In-Reply-To: <CA+CK2bBhW2hBystEfJyJ77xGNY9LHWLOLNN44E8hSuwO2yNs0Q@mail.gmail.com>
On Wed, Dec 2, 2020 at 1:19 PM Pavel Tatashin <pasha.tatashin@soleen.com> wrote:
>
> On Wed, Dec 2, 2020 at 11:33 AM Ira Weiny <ira.weiny@intel.com> wrote:
> >
> > On Wed, Dec 02, 2020 at 08:31:45AM -0800, 'Ira Weiny' wrote:
> > > On Wed, Dec 02, 2020 at 12:23:27AM -0500, Pavel Tatashin wrote:
> > > > __gup_longterm_locked() has CMA || FS_DAX version and a common stub
> > > > version. In the preparation of prohibiting longterm pinning of pages from
> > > > movable zone make the CMA || FS_DAX version common, and delete the stub
> > > > version.
> > > >
> > > > Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> > > > ---
> > > > mm/gup.c | 13 -------------
> > > > 1 file changed, 13 deletions(-)
> > > >
> > > > diff --git a/mm/gup.c b/mm/gup.c
> > > > index 3a76c005a3e2..0e2de888a8b0 100644
> > > > --- a/mm/gup.c
> > > > +++ b/mm/gup.c
> > > > @@ -1567,7 +1567,6 @@ struct page *get_dump_page(unsigned long addr)
> > > > }
> > > > #endif /* CONFIG_ELF_CORE */
> > > >
> > > > -#if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
> > > > #ifdef CONFIG_FS_DAX
> > > > static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
> > > > {
> > > > @@ -1757,18 +1756,6 @@ static long __gup_longterm_locked(struct mm_struct *mm,
> > > > kfree(vmas_tmp);
> > > > return rc;
> > > > }
> > >
> > > Isn't this going to potentially allocate vmas_tmp only to not need it when
> > > !FS_DAX and !CMA?
> >
> > To clarify, when FOLL_LONGTERM is set...
>
> Yes, this is the case. We need that because once migration is checked
> for all allocations, not only CMA, we need vmas_tmp for all cases.
A slight correction, we only need vmas_tmp for check_dax_vmas().
Potentially, we could wrap vmas_tmp allocation in a #ifdef for FS_DAX,
but I do not think this is really needed.
Pasha
>
> Pasha
>
> >
> > IRa
> >
> > >
> > > Ira
> > >
> > > > -#else /* !CONFIG_FS_DAX && !CONFIG_CMA */
> > > > -static __always_inline long __gup_longterm_locked(struct mm_struct *mm,
> > > > - unsigned long start,
> > > > - unsigned long nr_pages,
> > > > - struct page **pages,
> > > > - struct vm_area_struct **vmas,
> > > > - unsigned int flags)
> > > > -{
> > > > - return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
> > > > - NULL, flags);
> > > > -}
> > > > -#endif /* CONFIG_FS_DAX || CONFIG_CMA */
> > > >
> > > > static bool is_valid_gup_flags(unsigned int gup_flags)
> > > > {
> > > > --
> > > > 2.25.1
> > > >
> > > >
> > >
next prev parent reply other threads:[~2020-12-03 0:03 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 [this message]
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
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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