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[66.98.113.28]) by smtp.gmail.com with ESMTPSA id b189sm19198904pfb.194.2020.12.21.23.49.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 21 Dec 2020 23:49:15 -0800 (PST) From: Liang Li X-Google-Original-From: Liang Li Date: Tue, 22 Dec 2020 02:49:13 -0500 To: Alexander Duyck , Mel Gorman , Andrew Morton , Andrea Arcangeli , Dan Williams , "Michael S. Tsirkin" , David Hildenbrand , Jason Wang , Dave Hansen , Michal Hocko , Liang Li , Mike Kravetz , Liang Li Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, qemu-devel@nongnu.org Subject: [RFC PATCH 3/3] mm: support free hugepage pre zero out Message-ID: <20201222074910.GA30051@open-light-1.localdomain> Mail-Followup-To: Alexander Duyck , Mel Gorman , Andrew Morton , Andrea Arcangeli , Dan Williams , "Michael S. Tsirkin" , David Hildenbrand , Jason Wang , Dave Hansen , Michal Hocko , Liang Li , Mike Kravetz , Liang Li , linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, qemu-devel@nongnu.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch add support of pre zero out free hugepage, we can use this feature to speed up page population and page fault handing. Cc: Alexander Duyck Cc: Mel Gorman Cc: Andrea Arcangeli Cc: Dan Williams Cc: Dave Hansen Cc: David Hildenbrand Cc: Michal Hocko Cc: Andrew Morton Cc: Alex Williamson Cc: Michael S. Tsirkin Cc: Jason Wang Cc: Mike Kravetz Cc: Liang Li Signed-off-by: Liang Li --- mm/page_prezero.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/mm/page_prezero.c b/mm/page_prezero.c index c8ce720bfc54..dff4e0adf402 100644 --- a/mm/page_prezero.c +++ b/mm/page_prezero.c @@ -26,6 +26,7 @@ static unsigned long delay_millisecs = 1000; static unsigned long zeropage_enable __read_mostly; static DEFINE_MUTEX(kzeropaged_mutex); static struct page_reporting_dev_info zero_page_dev_info; +static struct page_reporting_dev_info zero_hugepage_dev_info; inline void clear_zero_page_flag(struct page *page, int order) { @@ -69,9 +70,17 @@ static int start_kzeropaged(void) zero_page_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); err = page_reporting_register(&zero_page_dev_info); + + zero_hugepage_dev_info.report = zero_free_pages; + zero_hugepage_dev_info.mini_order = mini_page_order; + zero_hugepage_dev_info.batch_size = batch_size; + zero_hugepage_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); + + err |= hugepage_reporting_register(&zero_hugepage_dev_info); pr_info("Zero page enabled\n"); } else { page_reporting_unregister(&zero_page_dev_info); + hugepage_reporting_unregister(&zero_hugepage_dev_info); pr_info("Zero page disabled\n"); } @@ -90,7 +99,15 @@ static int restart_kzeropaged(void) zero_page_dev_info.batch_size = batch_size; zero_page_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); + hugepage_reporting_unregister(&zero_hugepage_dev_info); + + zero_hugepage_dev_info.report = zero_free_pages; + zero_hugepage_dev_info.mini_order = mini_page_order; + zero_hugepage_dev_info.batch_size = batch_size; + zero_hugepage_dev_info.delay_jiffies = msecs_to_jiffies(delay_millisecs); + err = page_reporting_register(&zero_page_dev_info); + err |= hugepage_reporting_register(&zero_hugepage_dev_info); pr_info("Zero page enabled\n"); } -- 2.18.2