From patchwork Tue Apr 20 15:00:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 12214491 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=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 D0E82C433B4 for ; Tue, 20 Apr 2021 15:03:17 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 285706102A for ; Tue, 20 Apr 2021 15:03:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 285706102A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1SuLNiiuWqHTIzptwotdxVXi9r1rbeX2bcbV/JKPulA=; b=KMYaCRvHUt+PQfLJ98pgTdF3q ooMfFqZIuieZsp9Fd0Y6GPKY97TjDuU496rESKGwpnKTQ3wo6EdJKazK08zmqKfifJmfmmK9rD8Xn eWdur/yGg1MHlo1HB+EYCtRAjVCRn6wSJ2Bm2Ojp6GVmdXuzxHRH2BpA9mfy9yQEVp99Vj80VvctI kdDuJWeZrza53J4HM4q7WDkaIlaByh+U7CBMHM9MZzG92qClYrpheOU/a4368+k92d/pBUGN7fjlR pfGAn1+0JyFgK/RJ2chxrLFKWSkdhiBiR3Lj/2GImUrFFsecuQ2DUDDOtTDkfejybteWM8KwcdXnz 9E4+RGOnQ==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lYrsi-00CPMt-Ax; Tue, 20 Apr 2021 15:01:40 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lYrsZ-00CPLM-RR; Tue, 20 Apr 2021 15:01:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To:Content-ID:Content-Description; bh=SUg8wB0RrT5587aVCPvM1LiwsySkMaT1rmEJCD31MUk=; b=l6tqxfg+N8fNbthW5zDfICHte1 23ZSiywjyvAHD+Md/8Ev/itnOBZozGcn2/WWlmI/fEZPgqLJNfBtkJiCc/VdfIWtV/IKFBS65NquT nDFeubo1WCvFAHOKdrInTacOjwdFQNntYRyZg/8UBPiKZLvaI5PtA3uHOl3uugaqkANgNqJgMnZyG yN6kVLDHp3Kn1H+ND4HlRsCSaQgKv3jfcm85sY3D4+jTc4HZGQ9ki46sVbZr4KzCddMBY1JrIHmu0 wVtY+zzEGvBIDL3bLzmLSWBoHPl4d0EosB4GGZtmlZxGMnXRVKs/8jhYyGqpGSKLBlYLmso2ZZQBI yyDSerlw==; Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lYrsX-00CDQm-4q; Tue, 20 Apr 2021 15:01:30 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6BBEE613D1; Tue, 20 Apr 2021 15:01:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618930888; bh=I/WWp3ZhiKpLexAP/6uikhopmlNfpvxqz9r1ZOciMHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XwXn6wJhOGAPWFLJTXk9f9dCUdigjUcxoFpXuTTS7QeUKVHcKf3zboTSJuyxuYjhb 7S7xoeOnTbujEhT+qOIHjvQZre4ngKMAYrLa0rLDC3mofLug616wj1X5JSuijxJl3M wtWUvSC/otrlPsLI++IhM/Oomn7H4VvxqSgNKO7a+xupoT4mtWTM+1UljzJQw1bV49 aAL3dsbVJgqgEIWEnKruH97rHDTT/mkJA2/canG8R1Uf1jGMHr0nvKzI5l0LQUBq2w wnSLVpbmsRZF+NWjSRwMNhPpfFP2tVySPxwi4WHp6VrQK1Z5FqJbynTDJqoZBqn7aB joNOnC5v3AX0Q== From: Mike Rapoport To: Andrew Morton Cc: Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Matthew Garrett , Mark Rutland , Michal Hocko , Mike Rapoport , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , "Rafael J. Wysocki" , Rick Edgecombe , Roman Gushchin , Shakeel Butt , Shuah Khan , Thomas Gleixner , Tycho Andersen , Will Deacon , Yury Norov , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, kernel test robot Subject: [PATCH v3 2/2] secretmem: optimize page_is_secretmem() Date: Tue, 20 Apr 2021 18:00:49 +0300 Message-Id: <20210420150049.14031-3-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210420150049.14031-1-rppt@kernel.org> References: <20210420150049.14031-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210420_080129_290733_C8B586C6 X-CRM114-Status: GOOD ( 17.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Mike Rapoport Kernel test robot reported -4.2% regression of will-it-scale.per_thread_ops due to commit "mm: introduce memfd_secret system call to create "secret" memory areas". The perf profile of the test indicated that the regression is caused by page_is_secretmem() called from gup_pte_range() (inlined by gup_pgd_range): 27.76 +2.5 30.23 perf-profile.children.cycles-pp.gup_pgd_range 0.00 +3.2 3.19 ± 2% perf-profile.children.cycles-pp.page_mapping 0.00 +3.7 3.66 ± 2% perf-profile.children.cycles-pp.page_is_secretmem Further analysis showed that the slow down happens because neither page_is_secretmem() nor page_mapping() are not inline and moreover, multiple page flags checks in page_mapping() involve calling compound_head() several times for the same page. Make page_is_secretmem() inline and replace page_mapping() with page flag checks that do not imply page-to-head conversion. Reported-by: kernel test robot Signed-off-by: Mike Rapoport --- include/linux/secretmem.h | 26 +++++++++++++++++++++++++- mm/secretmem.c | 12 +----------- 2 files changed, 26 insertions(+), 12 deletions(-) diff --git a/include/linux/secretmem.h b/include/linux/secretmem.h index 907a6734059c..b842b38cbeb1 100644 --- a/include/linux/secretmem.h +++ b/include/linux/secretmem.h @@ -4,8 +4,32 @@ #ifdef CONFIG_SECRETMEM +extern const struct address_space_operations secretmem_aops; + +static inline bool page_is_secretmem(struct page *page) +{ + struct address_space *mapping; + + /* + * Using page_mapping() is quite slow because of the actual call + * instruction and repeated compound_head(page) inside the + * page_mapping() function. + * We know that secretmem pages are not compound and LRU so we can + * save a couple of cycles here. + */ + if (PageCompound(page) || !PageLRU(page)) + return false; + + mapping = (struct address_space *) + ((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); + + if (mapping != page->mapping) + return false; + + return page->mapping->a_ops == &secretmem_aops; +} + bool vma_is_secretmem(struct vm_area_struct *vma); -bool page_is_secretmem(struct page *page); bool secretmem_active(void); #else diff --git a/mm/secretmem.c b/mm/secretmem.c index 3b1ba3991964..0bcd15e1b549 100644 --- a/mm/secretmem.c +++ b/mm/secretmem.c @@ -151,22 +151,12 @@ static void secretmem_freepage(struct page *page) clear_highpage(page); } -static const struct address_space_operations secretmem_aops = { +const struct address_space_operations secretmem_aops = { .freepage = secretmem_freepage, .migratepage = secretmem_migratepage, .isolate_page = secretmem_isolate_page, }; -bool page_is_secretmem(struct page *page) -{ - struct address_space *mapping = page_mapping(page); - - if (!mapping) - return false; - - return mapping->a_ops == &secretmem_aops; -} - static struct vfsmount *secretmem_mnt; static struct file *secretmem_file_create(unsigned long flags)