From patchwork Fri Apr 30 05:55:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 12232353 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=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 D2BD2C43470 for ; Fri, 30 Apr 2021 05:55:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7BC8961462 for ; Fri, 30 Apr 2021 05:55:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7BC8961462 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1DF4B6B007B; Fri, 30 Apr 2021 01:55:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 143746B008C; Fri, 30 Apr 2021 01:55:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F26E06B0096; Fri, 30 Apr 2021 01:55:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0232.hostedemail.com [216.40.44.232]) by kanga.kvack.org (Postfix) with ESMTP id D6A206B007B for ; Fri, 30 Apr 2021 01:55:04 -0400 (EDT) Received: from smtpin32.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 9A6D68249980 for ; Fri, 30 Apr 2021 05:55:04 +0000 (UTC) X-FDA: 78087970128.32.FAB353D Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf29.hostedemail.com (Postfix) with ESMTP id F0EA0FA for ; Fri, 30 Apr 2021 05:54:59 +0000 (UTC) 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 Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=JEZ+o79r; dmarc=none; spf=pass (imf29.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Stat-Signature: obgyocwneqkwc4cfc6pp61jo5igmn8xt X-Rspamd-Queue-Id: F0EA0FA X-Rspamd-Server: rspam05 Received-SPF: none (linux-foundation.org>: No applicable sender policy available) receiver=imf29; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619762099-519928 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: 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);