From patchwork Thu May 13 07:20:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 12255267 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F1BBC433ED for ; Thu, 13 May 2021 07:20:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D1A77613D6 for ; Thu, 13 May 2021 07:20:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D1A77613D6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1C6B06B0036; Thu, 13 May 2021 03:20:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 176BF6B006E; Thu, 13 May 2021 03:20:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 03EAA6B0070; Thu, 13 May 2021 03:20:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0003.hostedemail.com [216.40.44.3]) by kanga.kvack.org (Postfix) with ESMTP id C90716B0036 for ; Thu, 13 May 2021 03:20:00 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 621301802DE0E for ; Thu, 13 May 2021 07:20:00 +0000 (UTC) X-FDA: 78135358560.05.4F5DB5A Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf09.hostedemail.com (Postfix) with ESMTP id 0FFB5600010A for ; Thu, 13 May 2021 07:19:47 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A1F53101E; Thu, 13 May 2021 00:19:58 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.78.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 905073F719; Thu, 13 May 2021 00:19:56 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Cc: Anshuman Khandual , Andrew Morton , Zi Yan , linux-kernel@vger.kernel.org Subject: [RFC] mm/thp: Update mm's MM_ANONPAGES stat in set_huge_zero_page() Date: Thu, 13 May 2021 12:50:38 +0530 Message-Id: <1620890438-9127-1-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 Authentication-Results: imf09.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf09.hostedemail.com: domain of anshuman.khandual@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 0FFB5600010A X-Stat-Signature: gqwcdky83wdi8r65rww1xhzm7xieprbo Received-SPF: none (arm.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=foss.arm.com; client-ip=217.140.110.172 X-HE-DKIM-Result: none/none X-HE-Tag: 1620890387-315748 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Although the zero huge page is being shared across various processes, each mapping needs to update its mm's MM_ANONPAGES stat by HPAGE_PMD_NR in order to be consistent. This just updates the stats in set_huge_zero_page() after the mapping gets created. Cc: Andrew Morton Cc: Zi Yan Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- Should it update MM_SHMEM_PAGES instead ? Applies on latest mainline. mm/huge_memory.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 63ed6b25deaa..262703304807 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -706,6 +706,7 @@ static void set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm, if (pgtable) pgtable_trans_huge_deposit(mm, pmd, pgtable); set_pmd_at(mm, haddr, pmd, entry); + add_mm_counter(mm, MM_ANONPAGES, HPAGE_PMD_NR); mm_inc_nr_ptes(mm); }