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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 47874C43462 for ; Fri, 30 Apr 2021 05:55:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2924A61463 for ; Fri, 30 Apr 2021 05:55:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230215AbhD3Fzv (ORCPT ); Fri, 30 Apr 2021 01:55:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:47706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230132AbhD3Fzv (ORCPT ); Fri, 30 Apr 2021 01:55:51 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4FA646145D; Fri, 30 Apr 2021 05:55:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1619762103; bh=8D4gNOIYDEDhSzprmBpt40R424WSNEhW20WBBf9cNEs=; h=Date:From:To:Subject:In-Reply-To:From; b=JEZ+o79r7lvEIRfwKOSpQ/LGsqhCUxLYCa+8TZH78lTKlCjDcu6A3QvaScmuD0Aor 0B2uMgx8HeOxI9MmyRTBHgE6C4ptBscChJ5AgVT4a7v6czq2K0yp+1Oud6LYLREIkw WQYN+M+jKOvMBu9AA4rNqB6Uvkt69sv1ZGnOFSNg= Date: Thu, 29 Apr 2021 22:55:02 -0700 From: Andrew Morton To: akpm@linux-foundation.org, iamjoonsoo.kim@lge.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, slyfox@gentoo.org, tglx@linutronix.de, torvalds@linux-foundation.org, vbabka@suse.cz Subject: [patch 036/178] mm: page_owner: fetch backtrace only for tracked pages Message-ID: <20210430055502.pQRjf3uAC%akpm@linux-foundation.org> In-Reply-To: <20210429225251.02b6386d21b69255b4f6c163@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Sergei Trofimovich Subject: mm: page_owner: fetch backtrace only for tracked pages Very minor optimization. Link: https://lkml.kernel.org/r/20210401212445.3534721-1-slyfox@gentoo.org Signed-off-by: Sergei Trofimovich Acked-by: Vlastimil Babka Cc: Joonsoo Kim Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- mm/page_owner.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/mm/page_owner.c~mm-page_owner-fetch-backtrace-only-for-tracked-pages +++ a/mm/page_owner.c @@ -147,15 +147,15 @@ void __reset_page_owner(struct page *pag { int i; struct page_ext *page_ext; - depot_stack_handle_t handle = 0; + depot_stack_handle_t handle; struct page_owner *page_owner; u64 free_ts_nsec = local_clock(); - handle = save_stack(GFP_NOWAIT | __GFP_NOWARN); - page_ext = lookup_page_ext(page); if (unlikely(!page_ext)) return; + + handle = save_stack(GFP_NOWAIT | __GFP_NOWARN); for (i = 0; i < (1 << order); i++) { __clear_bit(PAGE_EXT_OWNER_ALLOCATED, &page_ext->flags); page_owner = get_page_owner(page_ext); _