From patchwork Wed Aug 16 11:30:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muhammad Usama Anjum X-Patchwork-Id: 13355066 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50BA5C41513 for ; Wed, 16 Aug 2023 11:32:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244533AbjHPLbp (ORCPT ); Wed, 16 Aug 2023 07:31:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244504AbjHPLbZ (ORCPT ); Wed, 16 Aug 2023 07:31:25 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E1341B4; Wed, 16 Aug 2023 04:31:24 -0700 (PDT) Received: from localhost.localdomain (unknown [59.103.216.185]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: usama.anjum) by madras.collabora.co.uk (Postfix) with ESMTPSA id A19F26607204; Wed, 16 Aug 2023 12:31:17 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1692185483; bh=xDf3+oLHAaPp7qBRh6+bqrklOrWfQnDa6cvcD0WAiPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cFOWNpJCrTUuk6VU+0LobPMmJWERDhogNASN4oU54q/bhJ+A1I1MEHXImAF8hN4D4 n/+79tnuBtTLn6zVYrNy2uK78tNRgpojZP61qTWKkWe0MCkLHs1KXU3jCquBwaZppE OWxDUJo9t6MbLhgezxBD8SGCqnrko9E5K3kue9aVN2OYw3jPSdj/3QDJ16Xa9Altc0 w/g38aA6oO2jFaPdIgC4iZkOho1vB677rcHY+DzPgltVpxFFLPjM2WqsFtqukjaUon dgHedefhP8Gho7aKGla7AhxzkeEhlhnVRA6JTVibrphg7s9BGZ/OMzp76AoAhAyK6s gMjoGcjlp0zvQ== From: Muhammad Usama Anjum To: Peter Xu , Andrew Morton , =?utf-8?b?TWljaGHFgiBNaXJvc8WCYXc=?= , Andrei Vagin , Danylo Mocherniuk , Paul Gofman Cc: Alexander Viro , Shuah Khan , Christian Brauner , Yang Shi , Vlastimil Babka , "Liam R . Howlett" , Yun Zhou , Suren Baghdasaryan , Alex Sierra , Muhammad Usama Anjum , Matthew Wilcox , Pasha Tatashin , Axel Rasmussen , "Gustavo A . R . Silva" , Dan Williams , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Greg KH , kernel@collabora.com, Cyrill Gorcunov , Mike Rapoport , Nadav Amit , David Hildenbrand Subject: [PATCH v32 3/6] fs/proc/task_mmu: Add fast paths to get/clear PAGE_IS_WRITTEN flag Date: Wed, 16 Aug 2023 16:30:46 +0500 Message-Id: <20230816113049.1697849-4-usama.anjum@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230816113049.1697849-1-usama.anjum@collabora.com> References: <20230816113049.1697849-1-usama.anjum@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Adding fast code paths to handle specifically only get and/or clear operation of PAGE_IS_WRITTEN, increases its performance by 0-35%. The results of some test cases are given below: Test-case-1 t1 = (Get + WP) time t2 = WP time t1 t2 Without this patch: 140-170mcs 90-115mcs With this patch: 110mcs 80mcs Worst case diff: 35% faster 30% faster Test-case-2 t3 = atomic Get and WP t3 Without this patch: 120-140mcs With this patch: 100-110mcs Worst case diff: 21% faster Signed-off-by: Muhammad Usama Anjum --- The test to measure the performance can be found: https://is.gd/FtSKcD 8 8192 3 1 0 and 8 8192 3 1 1 arguments have been used to produce the above mentioned results. Changes in v29: - Minor updates in flush logic following the original patch --- fs/proc/task_mmu.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 0903e10e5fc08..5b61ba093ff3e 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2121,6 +2121,41 @@ static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start, return 0; } + if (!p->vec_out) { + /* Fast path for performing exclusive WP */ + for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { + if (pte_uffd_wp(ptep_get(pte))) + continue; + make_uffd_wp_pte(vma, addr, pte); + if (!flush_end) + start = addr; + flush_end = addr + PAGE_SIZE; + } + goto flush_and_return; + } + + if (!p->arg.category_anyof_mask && !p->arg.category_inverted && + p->arg.category_mask == PAGE_IS_WRITTEN && + p->arg.return_mask == PAGE_IS_WRITTEN) { + for (addr = start; addr < end; pte++, addr += PAGE_SIZE) { + unsigned long next = addr + PAGE_SIZE; + + if (pte_uffd_wp(ptep_get(pte))) + continue; + ret = pagemap_scan_output(p->cur_vma_category | PAGE_IS_WRITTEN, + p, addr, &next); + if (next == addr) + break; + if (~p->arg.flags & PM_SCAN_WP_MATCHING) + continue; + make_uffd_wp_pte(vma, addr, pte); + if (!flush_end) + start = addr; + flush_end = next; + } + goto flush_and_return; + } + for (addr = start; addr != end; pte++, addr += PAGE_SIZE) { unsigned long categories = p->cur_vma_category | pagemap_page_category(p, vma, addr, ptep_get(pte)); @@ -2144,6 +2179,7 @@ static int pagemap_scan_pmd_entry(pmd_t *pmd, unsigned long start, flush_end = next; } +flush_and_return: if (flush_end) flush_tlb_range(vma, start, addr);