From mboxrd@z Thu Jan 1 00:00:00 1970 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 348FAC6FD1C for ; Mon, 6 Mar 2023 16:35:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229917AbjCFQfU (ORCPT ); Mon, 6 Mar 2023 11:35:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46166 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229614AbjCFQeq (ORCPT ); Mon, 6 Mar 2023 11:34:46 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F4E7392B8; Mon, 6 Mar 2023 08:34:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678120450; x=1709656450; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=XCsSIC3ScIVlFqqz1tOQmvQAk4siU7dIf3EqDWAqQeU=; b=DjLjc8XphroSR/aSSvrS0SyjZhh77bjgLtFj5F6WDXooednxmUjLg/hq KlgtWH9P9HjrUA9DnoWfMFyVNcqVSZyQ94XQqT9EiZ/Tr94k5kXcmIn7c bohZbRi9vB5HqgojDTe5AGTVrjOxwYYSp1XWr3PpAajEVwgE3bmCT+z9y YY1xKI6T6ZbcQNhSP/Kfogjf5HVHbRHL5mzL2YAg/q/qn3Z/o98oeFsuU LsYjn0ws5DGXvxsxN7HZNbbKOz9o3/vuABGfC/EkU0Ll5fb8f2MNJlsLZ AxbREIqm7UXIBqZxburidTjhzHB3L9bc9hREahGd2fzm8zurL0eThjhXg A==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="315998572" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="315998572" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 08:32:26 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="745132798" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="745132798" Received: from lab-ah.igk.intel.com ([10.102.42.211]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 08:32:23 -0800 From: Andrzej Hajda Date: Mon, 06 Mar 2023 17:31:57 +0100 Subject: [PATCH v4 01/10] lib/ref_tracker: add unlocked leak print helper MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20230224-track_gt-v4-1-464e8ab4c9ab@intel.com> References: <20230224-track_gt-v4-0-464e8ab4c9ab@intel.com> In-Reply-To: <20230224-track_gt-v4-0-464e8ab4c9ab@intel.com> To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter Cc: linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Chris Wilson , netdev@vger.kernel.org, Eric Dumazet , Jakub Kicinski , Dmitry Vyukov , Andrzej Hajda , Chris Wilson X-Mailer: b4 0.11.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To have reliable detection of leaks, caller must be able to check under the same lock both: tracked counter and the leaks. dir.lock is natural candidate for such lock and unlocked print helper can be called with this lock taken. As a bonus we can reuse this helper in ref_tracker_dir_exit. Signed-off-by: Andrzej Hajda --- include/linux/ref_tracker.h | 8 ++++++ lib/ref_tracker.c | 66 ++++++++++++++++++++++++++------------------- 2 files changed, 46 insertions(+), 28 deletions(-) diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h index 9ca353ab712b5e..3e9e9df2a41f5f 100644 --- a/include/linux/ref_tracker.h +++ b/include/linux/ref_tracker.h @@ -36,6 +36,9 @@ static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir, void ref_tracker_dir_exit(struct ref_tracker_dir *dir); +void __ref_tracker_dir_print(struct ref_tracker_dir *dir, + unsigned int display_limit); + void ref_tracker_dir_print(struct ref_tracker_dir *dir, unsigned int display_limit); @@ -56,6 +59,11 @@ static inline void ref_tracker_dir_exit(struct ref_tracker_dir *dir) { } +static inline void __ref_tracker_dir_print(struct ref_tracker_dir *dir, + unsigned int display_limit) +{ +} + static inline void ref_tracker_dir_print(struct ref_tracker_dir *dir, unsigned int display_limit) { diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c index dc7b14aa3431e2..5e9f90bbf771b0 100644 --- a/lib/ref_tracker.c +++ b/lib/ref_tracker.c @@ -14,6 +14,38 @@ struct ref_tracker { depot_stack_handle_t free_stack_handle; }; +void __ref_tracker_dir_print(struct ref_tracker_dir *dir, + unsigned int display_limit) +{ + struct ref_tracker *tracker; + unsigned int i = 0; + + lockdep_assert_held(&dir->lock); + + list_for_each_entry(tracker, &dir->list, head) { + if (i < display_limit) { + pr_err("leaked reference.\n"); + if (tracker->alloc_stack_handle) + stack_depot_print(tracker->alloc_stack_handle); + i++; + } else { + break; + } + } +} +EXPORT_SYMBOL(__ref_tracker_dir_print); + +void ref_tracker_dir_print(struct ref_tracker_dir *dir, + unsigned int display_limit) +{ + unsigned long flags; + + spin_lock_irqsave(&dir->lock, flags); + __ref_tracker_dir_print(dir, display_limit); + spin_unlock_irqrestore(&dir->lock, flags); +} +EXPORT_SYMBOL(ref_tracker_dir_print); + void ref_tracker_dir_exit(struct ref_tracker_dir *dir) { struct ref_tracker *tracker, *n; @@ -27,13 +59,13 @@ void ref_tracker_dir_exit(struct ref_tracker_dir *dir) kfree(tracker); dir->quarantine_avail++; } - list_for_each_entry_safe(tracker, n, &dir->list, head) { - pr_err("leaked reference.\n"); - if (tracker->alloc_stack_handle) - stack_depot_print(tracker->alloc_stack_handle); + if (!list_empty(&dir->list)) { + __ref_tracker_dir_print(dir, 16); leak = true; - list_del(&tracker->head); - kfree(tracker); + list_for_each_entry_safe(tracker, n, &dir->list, head) { + list_del(&tracker->head); + kfree(tracker); + } } spin_unlock_irqrestore(&dir->lock, flags); WARN_ON_ONCE(leak); @@ -42,28 +74,6 @@ void ref_tracker_dir_exit(struct ref_tracker_dir *dir) } EXPORT_SYMBOL(ref_tracker_dir_exit); -void ref_tracker_dir_print(struct ref_tracker_dir *dir, - unsigned int display_limit) -{ - struct ref_tracker *tracker; - unsigned long flags; - unsigned int i = 0; - - spin_lock_irqsave(&dir->lock, flags); - list_for_each_entry(tracker, &dir->list, head) { - if (i < display_limit) { - pr_err("leaked reference.\n"); - if (tracker->alloc_stack_handle) - stack_depot_print(tracker->alloc_stack_handle); - i++; - } else { - break; - } - } - spin_unlock_irqrestore(&dir->lock, flags); -} -EXPORT_SYMBOL(ref_tracker_dir_print); - int ref_tracker_alloc(struct ref_tracker_dir *dir, struct ref_tracker **trackerp, gfp_t gfp) -- 2.34.1