From: Ira Weiny <ira.weiny@intel.com>
To: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org, vbabka@suse.cz, mhocko@suse.com,
david@redhat.com, osalvador@suse.de, dan.j.williams@intel.com,
sashal@kernel.org, tyhicks@linux.microsoft.com,
iamjoonsoo.kim@lge.com, mike.kravetz@oracle.com,
rostedt@goodmis.org, mingo@redhat.com, jgg@ziepe.ca,
peterz@infradead.org, mgorman@suse.de, willy@infradead.org,
rientjes@google.com, jhubbard@nvidia.com
Subject: Re: [PATCH 1/6] mm/gup: perform check_dax_vmas only when FS_DAX is enabled
Date: Wed, 2 Dec 2020 08:22:15 -0800 [thread overview]
Message-ID: <20201202162215.GS1161629@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20201202052330.474592-2-pasha.tatashin@soleen.com>
On Wed, Dec 02, 2020 at 12:23:25AM -0500, Pavel Tatashin wrote:
> There is no need to check_dax_vmas() and run through the npage loop of
> pinned pages if FS_DAX is not enabled.
>
> Add a stub check_dax_vmas() function for no-FS_DAX case.
This looks like a good idea.
>
> Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> ---
> mm/gup.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/mm/gup.c b/mm/gup.c
> index 98eb8e6d2609..cdb8b9eeb016 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -1568,6 +1568,7 @@ struct page *get_dump_page(unsigned long addr)
> #endif /* CONFIG_ELF_CORE */
>
> #if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
In addition, I think it would make a lot of sense to clean up this config as
well like this:
08:20:10 > git di
diff --git a/mm/gup.c b/mm/gup.c
index 102877ed77a4..92cfda220aeb 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1567,7 +1567,7 @@ 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)
{
long i;
@@ -1586,6 +1586,12 @@ static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
}
return false;
}
+#else
+static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
+{
+ return false;
+}
+#endif /* CONFIG_FS_DAX */
#ifdef CONFIG_CMA
static long check_and_migrate_cma_pages(struct mm_struct *mm,
@@ -1691,6 +1697,7 @@ static long check_and_migrate_cma_pages(struct mm_struct *mm,
}
#endif /* CONFIG_CMA */
+#if defined(CONFIG_FS_DAX) || defined (CONFIG_CMA)
/*
* __gup_longterm_locked() is a wrapper for __get_user_pages_locked which
* allows us to process the FOLL_LONGTERM flag.
That makes it more clear what is going on with __gup_longterm_locked() and
places both CMA and FS_DAX code within their own blocks.
Ira
> +#ifdef CONFIG_FS_DAX
> static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
> {
> long i;
> @@ -1586,6 +1587,12 @@ static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
> }
> return false;
> }
> +#else
> +static bool check_dax_vmas(struct vm_area_struct **vmas, long nr_pages)
> +{
> + return false;
> +}
> +#endif
>
> #ifdef CONFIG_CMA
> static long check_and_migrate_cma_pages(struct mm_struct *mm,
> --
> 2.25.1
>
>
next prev parent reply other threads:[~2020-12-02 16:22 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 [this message]
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
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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