From patchwork Tue Mar 28 15:15:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrzej Hajda X-Patchwork-Id: 13191216 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 04121C76196 for ; Tue, 28 Mar 2023 15:16:04 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 16D1010E3DE; Tue, 28 Mar 2023 15:16:02 +0000 (UTC) Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6EA8610E91C; Tue, 28 Mar 2023 15:15:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1680016551; x=1711552551; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=k2hx/WBFqL7VuFz0I6+8fGkxNCCWOhJe2NR5annG8QI=; b=Wy/x9NANPixK0qDrUIrbk7hbVbXtTtMgsCJI7m0V/Cuts+IYqdC0sNco lil+p17MpmVvFkKhO0NYQwo/R83gonrdk+esgx0Aa1N7mDTLiZCQW8Hlh +zAVOkb4QFwbkTlGkTlajgdJoY4Xa/5QMfBGbT75B0m+WGucW98qMZXtS UQBb6WsTWe6RoeXg4/WQ8GuqKpLwcfxgy/l39GDgD9PpGE1zRd2xC+ryW ElkvxKHOHgygoKhZZy7n6hEjybp7QVjcPoNwa8dLIcNuHmTToJMAnRkZl OQLcekksBtCmWLWYSX6pPQciW5h5W4yHUKbOoUVASoZ3kOsicO1QU+PUv g==; X-IronPort-AV: E=McAfee;i="6600,9927,10663"; a="403208618" X-IronPort-AV: E=Sophos;i="5.98,297,1673942400"; d="scan'208";a="403208618" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Mar 2023 08:15:49 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10663"; a="773181739" X-IronPort-AV: E=Sophos;i="5.98,297,1673942400"; d="scan'208";a="773181739" Received: from lab-ah.igk.intel.com ([10.102.138.202]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Mar 2023 08:15:46 -0700 From: Andrzej Hajda Date: Tue, 28 Mar 2023 17:15:24 +0200 Subject: [PATCH v5 1/8] lib/ref_tracker: add unlocked leak print helper MIME-Version: 1.0 Message-Id: <20230224-track_gt-v5-1-77be86f2c872@intel.com> References: <20230224-track_gt-v5-0-77be86f2c872@intel.com> In-Reply-To: <20230224-track_gt-v5-0-77be86f2c872@intel.com> To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter X-Mailer: b4 0.11.1 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andi Shyti , netdev@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Wilson , Eric Dumazet , Andrzej Hajda , Jakub Kicinski , "David S. Miller" , Dmitry Vyukov Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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..87a92f2bec1b88 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_locked(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_locked(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..d4eb0929af8f96 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_locked(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_locked); + +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_locked(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_locked(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)