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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id s131sm4318378oib.52.2021.07.07.13.13.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 13:13:37 -0700 (PDT) Date: Wed, 7 Jul 2021 13:13:33 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@ripple.anvils To: Andrew Morton cc: Hugh Dickins , Alistair Popple , Jason Gunthorpe , Ralph Campbell , Christoph Hellwig , Yang Shi , "Kirill A. Shutemov" , Shakeel Butt , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/4] mm/rmap: try_to_migrate() skip zone_device !device_private In-Reply-To: <563ce5b2-7a44-5b4d-1dfd-59a0e65932a9@google.com> Message-ID: <1241d356-8ec9-f47b-a5ec-9b2bf66d242@google.com> References: <563ce5b2-7a44-5b4d-1dfd-59a0e65932a9@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I know nothing about zone_device pages and !device_private pages; but if try_to_migrate_one() will do nothing for them, then it's better that try_to_migrate() filter them first, than trawl through all their vmas. Signed-off-by: Hugh Dickins --- mm/rmap.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 1235368f0628..795f9d5f8386 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1703,9 +1703,6 @@ static bool try_to_migrate_one(struct page *page, struct vm_area_struct *vma, struct mmu_notifier_range range; enum ttu_flags flags = (enum ttu_flags)(long)arg; - if (is_zone_device_page(page) && !is_device_private_page(page)) - return true; - /* * When racing against e.g. zap_pte_range() on another cpu, * in between its ptep_get_and_clear_full() and page_remove_rmap(), @@ -1944,6 +1941,9 @@ void try_to_migrate(struct page *page, enum ttu_flags flags) TTU_SYNC))) return; + if (is_zone_device_page(page) && !is_device_private_page(page)) + return; + /* * During exec, a temporary VMA is setup and later moved. * The VMA is moved under the anon_vma lock but not the -- 2.26.2