From patchwork Mon Feb 12 22:30:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 200091 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:bc8a:b0:106:860b:bbdd with SMTP id dn10csp200996dyb; Mon, 12 Feb 2024 14:31:02 -0800 (PST) X-Forwarded-Encrypted: i=3; AJvYcCXuy96saindprxlm7lZ6Ooi78zdYOMiAMSWGqDeSUeREAj0kN+MLtFO0pfgp5qVVYCQTC3orORielJJt2cGil1beItKEw== X-Google-Smtp-Source: AGHT+IGOF9XBLdU/funnlPRbMGTFJZTBbGyZacP+fQVW3GhkgKhBo9hkC/rX3ZXch9PPZoRoizz7 X-Received: by 2002:a17:906:1dc7:b0:a38:4f6a:4e7e with SMTP id v7-20020a1709061dc700b00a384f6a4e7emr701104ejh.32.1707777061797; Mon, 12 Feb 2024 14:31:01 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1707777061; cv=pass; d=google.com; s=arc-20160816; b=yEkR8/q5QjsFveaNbtAZkCSBEouDybHxCVBwC9oTdodTc9IhU0DIZWKqz+QsJQZL6C H0F6Sv7kENxd/1lNbl3JjU33u7yb5gaTUllvsZwVocIq3nSU1wBhVdM9B0olOjW7y3m1 Dzkh5+/oJW7OKNgs5EDVnb8kzJAU4LhrX80+DnXmJ86oGr2RcR2+S/Jz74kLOdAD3bXS gpMr2hZr9VYyjwWF9lunRhVnEX71vcvESEE2V/q4TuR8fypKO6qIDD/xYiuu1SJtUTCh CT5AyCzWaB0VRxbLl/X6NLlAJOzJJgqqR6uIWKvtGBKCqDCDlT2lmP7fPFaNRHijSIfh 1ZVw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature:dkim-signature :dkim-signature:dkim-signature; bh=C1CzNFL4PMmMQSHbggAgsOI2ejs0tMDCon93dbkR538=; fh=aKM+fxRcXsbtuExarVGqVdXHz4RvYi8MC+Jr6VCMH+w=; b=CP24hVYNTHE9uoV5QdVZoHNTFhHapwdeaX1+zOq4DiLnPdJpLOPzcyDJxP0OClqtNN onYLpxxQ8I2v72z+ZpfLpFPR8rHX9Q1xgmGuvG6XHDEfsQ0Crc9F8oTD/LVGibrGu8W6 pgkoNynVowHBYT1DiN0Y56+Q5cMx9rlhTomIBDK4tF1pSsUThvK7+/2dg9JLQgCVhhp7 gc+lh8BS/oAmd84IZwoqCEiaw/omivvQG5VWuM7Uhyz3sySVgrA/bDAsI3DQOX/LS6Ie 0bITKfAjR90xuCw7vm7x7YqZ5RUhV2EhjMOM/71vknBhQ8WqkViJqIVCfMPXfRGlAeFc BWIQ==; dara=google.com ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@suse.de header.s=susede2_rsa header.b=0Hkksmim; dkim=neutral (no key) header.i=@suse.de header.s=susede2_ed25519; dkim=pass header.i=@suse.de header.s=susede2_rsa header.b=0Hkksmim; dkim=neutral (no key) header.i=@suse.de header.s=susede2_ed25519; arc=pass (i=1 spf=pass spfdomain=suse.de dkim=pass dkdomain=suse.de dkim=pass dkdomain=suse.de dmarc=pass fromdomain=suse.de); spf=pass (google.com: domain of linux-kernel+bounces-62482-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-62482-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=suse.de X-Forwarded-Encrypted: i=2; AJvYcCXLzVm5O5I+zmC2e1IawLgpSesXarbsUF7XYP/8w2XBGfgLo6QbHo1lgh+xcK8H1gdLwWKN8b7IMRe0YRlW2N0Gg8uM+w== Received: from am.mirrors.kernel.org (am.mirrors.kernel.org. [147.75.80.249]) by mx.google.com with ESMTPS id by16-20020a170906a2d000b00a3c120bb3b4si600287ejb.0.2024.02.12.14.31.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Feb 2024 14:31:01 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-62482-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249; Authentication-Results: mx.google.com; dkim=pass header.i=@suse.de header.s=susede2_rsa header.b=0Hkksmim; dkim=neutral (no key) header.i=@suse.de header.s=susede2_ed25519; dkim=pass header.i=@suse.de header.s=susede2_rsa header.b=0Hkksmim; dkim=neutral (no key) header.i=@suse.de header.s=susede2_ed25519; arc=pass (i=1 spf=pass spfdomain=suse.de dkim=pass dkdomain=suse.de dkim=pass dkdomain=suse.de dmarc=pass fromdomain=suse.de); spf=pass (google.com: domain of linux-kernel+bounces-62482-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-62482-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=suse.de Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id 3AC821F22AB7 for ; Mon, 12 Feb 2024 22:31:01 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4E7705101E; Mon, 12 Feb 2024 22:29:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="0Hkksmim"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="ZnVGi03v"; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="0Hkksmim"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="ZnVGi03v" Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 439AB4F613 for ; Mon, 12 Feb 2024 22:29:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707776977; cv=none; b=hy8Djrvv5/1Tje0dqjdzeLeDFycOz4smjDbvEXVQVBVSspVg/aw4+e8EA2+2Hz0Jb6iNmp7e7tY2WJf9wjQd29ZO8TGs2/eGZz0LprrfhpXje3bq83++qDslRe3I3EnVNnr5VzwwxgEb+PdmVuzViiE40XgqvMQ7FqCTzDFGXDs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707776977; c=relaxed/simple; bh=kovR+ZrYRhElztUO/xzkg9t4G7s0y135A+ZgTQIhorg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oq6jUNACA7JWwrlaZ67wwKIOuichchUapeNXjsi3Byza8Xz+AZJqM87La27UeNAdwezaJzQq4qKvLAt7ZMQEDze+Kh7untAeLoOAdjtsyj/h4uh00QOiWHLhncAk4Ja7OJeK4UD+NQ18ploo8NGe1fIVQsp8TkrWQ80udlM0cGE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=0Hkksmim; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=ZnVGi03v; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=0Hkksmim; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=ZnVGi03v; arc=none smtp.client-ip=195.135.223.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Received: from imap2.dmz-prg2.suse.org (imap2.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:98]) (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) by smtp-out1.suse.de (Postfix) with ESMTPS id AD61222177; Mon, 12 Feb 2024 22:29:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1707776973; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=C1CzNFL4PMmMQSHbggAgsOI2ejs0tMDCon93dbkR538=; b=0HkksmimAKf1X2UchGs1ECrVRZPKtKpJwt693l9NOKJ5pJjpsp/SyDvukNl5wLeGnSUFbx AYwqmHSTXqM/SJpVRjlMOBOxO0rM/s0c6MDVVlIlJYcTLyTM3upL1YC6miq4zlePc2ZO79 zdX7qh0CWgh/3uAXle7lIRUwWwtjOlE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1707776973; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=C1CzNFL4PMmMQSHbggAgsOI2ejs0tMDCon93dbkR538=; b=ZnVGi03vheW9LR2lPrO/6uN0847XkDBVnIfGMln6MKkPIGMcvcEckEGoHOIS/MPPxXr9Ab pgLcrPPJ9Uwoh3Ag== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1707776973; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=C1CzNFL4PMmMQSHbggAgsOI2ejs0tMDCon93dbkR538=; b=0HkksmimAKf1X2UchGs1ECrVRZPKtKpJwt693l9NOKJ5pJjpsp/SyDvukNl5wLeGnSUFbx AYwqmHSTXqM/SJpVRjlMOBOxO0rM/s0c6MDVVlIlJYcTLyTM3upL1YC6miq4zlePc2ZO79 zdX7qh0CWgh/3uAXle7lIRUwWwtjOlE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1707776973; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=C1CzNFL4PMmMQSHbggAgsOI2ejs0tMDCon93dbkR538=; b=ZnVGi03vheW9LR2lPrO/6uN0847XkDBVnIfGMln6MKkPIGMcvcEckEGoHOIS/MPPxXr9Ab pgLcrPPJ9Uwoh3Ag== Received: from imap2.dmz-prg2.suse.org (localhost [127.0.0.1]) (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) by imap2.dmz-prg2.suse.org (Postfix) with ESMTPS id 2A3A613212; Mon, 12 Feb 2024 22:29:33 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap2.dmz-prg2.suse.org with ESMTPSA id 6IORB82bymX5JgAAn2gu4w (envelope-from ); Mon, 12 Feb 2024 22:29:33 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Marco Elver , Andrey Konovalov , Alexander Potapenko , Oscar Salvador Subject: [PATCH v8 5/5] mm,page_owner: Update Documentation regarding page_owner_stacks Date: Mon, 12 Feb 2024 23:30:29 +0100 Message-ID: <20240212223029.30769-6-osalvador@suse.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240212223029.30769-1-osalvador@suse.de> References: <20240212223029.30769-1-osalvador@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=0Hkksmim; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=ZnVGi03v X-Spamd-Result: default: False [4.11 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; R_MISSING_CHARSET(2.50)[]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; BROKEN_CONTENT_TYPE(1.50)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.de:+]; MX_GOOD(-0.01)[]; RCPT_COUNT_SEVEN(0.00)[9]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_CC(0.00)[vger.kernel.org,kvack.org,suse.com,suse.cz,google.com,gmail.com,suse.de]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-0.58)[81.40%] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Score: 4.11 X-Rspamd-Queue-Id: AD61222177 X-Spam-Level: **** X-Spam-Flag: NO X-Spamd-Bar: ++++ X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790734040235308510 X-GMAIL-MSGID: 1790734040235308510 Update page_owner documentation including the new page_owner_stacks feature to show how it can be used. Signed-off-by: Oscar Salvador --- Documentation/mm/page_owner.rst | 44 +++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/Documentation/mm/page_owner.rst b/Documentation/mm/page_owner.rst index 62e3f7ab23cc..bcde81bf0902 100644 --- a/Documentation/mm/page_owner.rst +++ b/Documentation/mm/page_owner.rst @@ -24,6 +24,11 @@ fragmentation statistics can be obtained through gfp flag information of each page. It is already implemented and activated if page owner is enabled. Other usages are more than welcome. +It can also be used to show all the stacks and their outstanding +allocations, which gives us a quick overview of where the memory is going +without the need to screen through all the pages and match the allocation +and free operation. + page owner is disabled by default. So, if you'd like to use it, you need to add "page_owner=on" to your boot cmdline. If the kernel is built with page owner and page owner is disabled in runtime due to not enabling @@ -68,6 +73,45 @@ Usage 4) Analyze information from page owner:: + cat /sys/kernel/debug/page_owner_stacks/show_stacks > stacks.txt + cat stacks.txt + prep_new_page+0xa9/0x120 + get_page_from_freelist+0x7e6/0x2140 + __alloc_pages+0x18a/0x370 + new_slab+0xc8/0x580 + ___slab_alloc+0x1f2/0xaf0 + __slab_alloc.isra.86+0x22/0x40 + kmem_cache_alloc+0x31b/0x350 + __khugepaged_enter+0x39/0x100 + dup_mmap+0x1c7/0x5ce + copy_process+0x1afe/0x1c90 + kernel_clone+0x9a/0x3c0 + __do_sys_clone+0x66/0x90 + do_syscall_64+0x7f/0x160 + entry_SYSCALL_64_after_hwframe+0x6c/0x74 + stack_count: 234 + ... + ... + echo 7000 > /sys/kernel/debug/page_owner_stacks/set_threshold > stacks_7000.txt + cat stacks_7000.txt + prep_new_page+0xa9/0x120 + get_page_from_freelist+0x7e6/0x2140 + __alloc_pages+0x18a/0x370 + alloc_pages_mpol+0xdf/0x1e0 + folio_alloc+0x14/0x50 + filemap_alloc_folio+0xb0/0x100 + page_cache_ra_unbounded+0x97/0x180 + filemap_fault+0x4b4/0x1200 + __do_fault+0x2d/0x110 + do_pte_missing+0x4b0/0xa30 + __handle_mm_fault+0x7fa/0xb70 + handle_mm_fault+0x125/0x300 + do_user_addr_fault+0x3c9/0x840 + exc_page_fault+0x68/0x150 + asm_exc_page_fault+0x22/0x30 + stack_count: 8248 + ... + cat /sys/kernel/debug/page_owner > page_owner_full.txt ./page_owner_sort page_owner_full.txt sorted_page_owner.txt