From patchwork Thu Sep 1 04:42:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 12961748 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC970ECAAD2 for ; Thu, 1 Sep 2022 04:43:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 21DD68D0005; Thu, 1 Sep 2022 00:43:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 10A326B0073; Thu, 1 Sep 2022 00:43:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E28CD8D0005; Thu, 1 Sep 2022 00:42:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id D5B666B0072 for ; Thu, 1 Sep 2022 00:42:59 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id A2F801C65DC for ; Thu, 1 Sep 2022 04:42:59 +0000 (UTC) X-FDA: 79862271678.29.363C26F Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by imf08.hostedemail.com (Postfix) with ESMTP id 0AF2E160056 for ; Thu, 1 Sep 2022 04:42:58 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id D2024221EE; Thu, 1 Sep 2022 04:42:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1662007377; 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=e8DWylbFwSCb/px9RHGyLSh+EhBiVeZp3bgNDtmW9IA=; b=S7u1rvndnGXFGe9gpIQARWw/22R+6XqNKcNzRqacOvUWansQ9BHdjWh8iRcKXrqgqLuOV2 v6DNKPXLbjMM5RWzIlyGrePp8e4xf2+G40n99CDJxSnS5QOyKG04Sjxj+U0/vhXgjzyXUW RP6Cdu7Ae7QcP7PhwIku/EEFbAb/KXE= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1662007377; 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=e8DWylbFwSCb/px9RHGyLSh+EhBiVeZp3bgNDtmW9IA=; b=BPF/tSxXMQDSvEmbgyPhuBR9rysuTMAjY41Rxsu8/nW5dEMdII4hStCGu0uptmYWj17dRU oJeH7qfBX4uymWBw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 32E2C139C4; Thu, 1 Sep 2022 04:42:57 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id WKusCVE4EGPheAAAMHmgww (envelope-from ); Thu, 01 Sep 2022 04:42:57 +0000 From: Oscar Salvador To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Eric Dumazet , Waiman Long , Suren Baghdasaryan , Oscar Salvador Subject: [PATCH 3/3] mm,page_owner: Filter out stacks by a threshold counter Date: Thu, 1 Sep 2022 06:42:49 +0200 Message-Id: <20220901044249.4624-4-osalvador@suse.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220901044249.4624-1-osalvador@suse.de> References: <20220901044249.4624-1-osalvador@suse.de> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1662007379; a=rsa-sha256; cv=none; b=mCWh4AZ2WGQk6wDjIgXNtMK+lW2eDYJ4f2fY/4RWs2QbqyFuOMkxaq7M53JIy3Py3+2n2N 07AR/m8SK6X4qp0+2JhKnbW+a3Y83oVtB5T40VSfA7HJytVioFFTbzoxqZhzJ3bawnVzsT 6v5LojIWW3yxYizQQDAEeS6l8XgxwPA= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=S7u1rvnd; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b="BPF/tSxX"; spf=pass (imf08.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.28 as permitted sender) smtp.mailfrom=osalvador@suse.de; dmarc=pass (policy=none) header.from=suse.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1662007379; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=e8DWylbFwSCb/px9RHGyLSh+EhBiVeZp3bgNDtmW9IA=; b=2UFcS8uTAmCgSuh/ZMtfJUh2tZZpNbOWViowsx3kkP4e0GdnX3ZBXHGNUjr8S6Z4ak8tNO wMvaUEarcc0XlUkiE9Kklm4AStlpoZGPKp1EZNpMxqSGm28t6zUgbE2RDI+WCBfnd1T6RX 9qqFlhlk8prhOYAbIBvvOhXD2icuWxw= X-Rspamd-Queue-Id: 0AF2E160056 X-Rspam-User: Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=S7u1rvnd; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b="BPF/tSxX"; spf=pass (imf08.hostedemail.com: domain of osalvador@suse.de designates 195.135.220.28 as permitted sender) smtp.mailfrom=osalvador@suse.de; dmarc=pass (policy=none) header.from=suse.de X-Rspamd-Server: rspam03 X-Stat-Signature: 5iw3qz97d339hegpexa1gy9k6x54j36y X-HE-Tag: 1662007378-847884 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: We want to be able to filter out the output on a threshold basis, in this way we can get rid of a lot of noise and focus only on those stacks which have an allegedly high counter. We can control the threshold value by a new file called 'page_owner_threshold', which is 0 by default. Signed-off-by: Oscar Salvador --- include/linux/stackdepot.h | 3 +- lib/stackdepot.c | 6 ++-- mm/page_owner.c | 61 +++++++++++++++++++++++++++++++++++++- 3 files changed, 66 insertions(+), 4 deletions(-) diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h index 20f62039f23a..ee66be40a152 100644 --- a/include/linux/stackdepot.h +++ b/include/linux/stackdepot.h @@ -26,7 +26,8 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries, stack_action_t action); void stack_depot_dec_count(depot_stack_handle_t handle); int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos, - unsigned long *last_stack); + unsigned long *last_stack, + unsigned long threshold); /* * Every user of stack depot has to call stack_depot_init() during its own init diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 3090ae0f3958..b4a04f09a7b7 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -528,7 +528,8 @@ depot_stack_handle_t stack_depot_save_action(unsigned long *entries, EXPORT_SYMBOL_GPL(stack_depot_save_action); int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos, - unsigned long *last_stack) + unsigned long *last_stack, + unsigned long threshold) { struct stack_record *stack = NULL, *last; struct stack_record **stacks; @@ -547,7 +548,8 @@ int stack_depot_print_stacks_threshold(char *buf, size_t size, loff_t *pos, for (; stack; stack = stack->next) { if (!stack->size || stack->size < 0 || stack->size > size || stack->handle.valid != 1 || - refcount_read(&stack->count) < 1) + refcount_read(&stack->count) < 1 || + refcount_read(&stack->count) < threshold) continue; ret += stack_trace_snprint(buf, size, stack->entries, stack->size, 0); diff --git a/mm/page_owner.c b/mm/page_owner.c index 8c67c7eb2451..ef10cf44aaec 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -44,6 +44,7 @@ static depot_stack_handle_t early_handle; static void init_early_allocated_pages(void); static unsigned long last_stack = 0; +static unsigned long threshold_count = 0; static int __init early_page_owner_param(char *buf) { @@ -676,7 +677,8 @@ static ssize_t read_page_owner_stacks(struct file *file, char __user *buf, if (!kbuf) return ENOMEM; - ret += stack_depot_print_stacks_threshold(kbuf, count, pos, &last_stack); + ret += stack_depot_print_stacks_threshold(kbuf, count, pos, &last_stack, + threshold_count); if (copy_to_user(buf, kbuf, ret)) ret = -EFAULT; @@ -687,6 +689,61 @@ static ssize_t read_page_owner_stacks(struct file *file, char __user *buf, return ret; } +static ssize_t read_page_owner_threshold(struct file *file, char __user *buf, + size_t count, loff_t *pos) +{ + char *kbuf; + int ret = 0; + + count = min_t(size_t, count, PAGE_SIZE); + + if (*pos >= count) + return 0; + + kbuf = kmalloc(count, GFP_KERNEL); + if (!kbuf) + return ENOMEM; + + ret = scnprintf(kbuf, count, "%lu\n", threshold_count); + if (copy_to_user(buf, kbuf, ret)) + ret = -EFAULT; + + *pos += count; + kfree(kbuf); + + return ret; +} + +static ssize_t write_page_owner_threshold(struct file *file, const char __user *buf, + size_t count, loff_t *pos) +{ + char *kbuf; + int ret = 0; + + count = min_t(size_t, count, PAGE_SIZE); + kbuf = kmalloc(count, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + if (copy_from_user(kbuf, buf, count)) { + ret = -EFAULT; + goto out; + } + + kbuf[count - 1] = '\0'; + + ret = kstrtoul(kbuf, 10, &threshold_count); + +out: + kfree(kbuf); + return ret ? ret : count; +} + +static const struct file_operations proc_page_owner_threshold = { + .read = read_page_owner_threshold, + .write = write_page_owner_threshold, +}; + static const struct file_operations proc_page_owner_stacks = { .read = read_page_owner_stacks, }; @@ -706,6 +763,8 @@ static int __init pageowner_init(void) &proc_page_owner_operations); debugfs_create_file("page_owner_stacks", 0400, NULL, NULL, &proc_page_owner_stacks); + debugfs_create_file("page_owner_threshold", 0600, NULL, NULL, + &proc_page_owner_threshold); return 0; }