From mboxrd@z Thu Jan 1 00:00:00 1970 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=ham 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 271DAC433B4 for ; Thu, 13 May 2021 07:20:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E7963613F6 for ; Thu, 13 May 2021 07:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231546AbhEMHVJ (ORCPT ); Thu, 13 May 2021 03:21:09 -0400 Received: from foss.arm.com ([217.140.110.172]:58400 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229786AbhEMHVI (ORCPT ); Thu, 13 May 2021 03:21:08 -0400 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); } -- 2.20.1