From patchwork Mon Mar 6 16:31:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrzej Hajda X-Patchwork-Id: 13161739 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 1DC10C64EC4 for ; Mon, 6 Mar 2023 16:32:41 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E4C6410E3EC; Mon, 6 Mar 2023 16:32:36 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0190810E3EC; Mon, 6 Mar 2023 16:32:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678120354; x=1709656354; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=fkjGvDLGnqfWXqERgwLxoLJ8bMf+bRuRswHYc5L4n/I=; b=AC3xOPTXdwjzi9gXMoUbPItH+/Ay8eSaMAxEGrPgCDk3Lr9KKOqyQ4UG BPylngjacsqnppx1ORANK1BKvcbadA1FdqfYrYkfuhnl619PPOJ8wDxaC rZsXEt/csldPd2NTXdkpKRHaHw/iY8pswoprtjxCOYikboZwlJ/kKNVYv AFJaH80EBWpPiB2gmWPrjjXjA0Vu3YVFauIWmyWQV92TiMxhW91lZZo/u O7TwIfrlu0lo74BqRvOl0/9dfNu/ZRirzw4VquD3H7B/RVzKXlrVMxrM2 ovpTji5HYEPW7aZPADB0L/4V9IYl3ycK0lHwQlvClhPT/EbAFavMJTkqf w==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="315998630" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="315998630" 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 08:32:32 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="745132845" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="745132845" 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 08:32:29 -0800 From: Andrzej Hajda Date: Mon, 06 Mar 2023 17:31:59 +0100 Subject: [PATCH v4 03/10] lib/ref_tracker: add printing to memory buffer MIME-Version: 1.0 Message-Id: <20230224-track_gt-v4-3-464e8ab4c9ab@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 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: netdev@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chris Wilson , Eric Dumazet , Chris Wilson , Andrzej Hajda , Jakub Kicinski , Dmitry Vyukov Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In case one wants to show stats via debugfs. Signed-off-by: Andrzej Hajda --- include/linux/ref_tracker.h | 8 +++++++ lib/ref_tracker.c | 56 ++++++++++++++++++++++++++++++++++++++------- 2 files changed, 56 insertions(+), 8 deletions(-) diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h index a2cf1f6309adb2..2fdbfd2e14797a 100644 --- a/include/linux/ref_tracker.h +++ b/include/linux/ref_tracker.h @@ -50,6 +50,8 @@ void __ref_tracker_dir_print(struct ref_tracker_dir *dir, void ref_tracker_dir_print(struct ref_tracker_dir *dir, unsigned int display_limit); +int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, char *buf, size_t size); + int ref_tracker_alloc(struct ref_tracker_dir *dir, struct ref_tracker **trackerp, gfp_t gfp); @@ -78,6 +80,12 @@ static inline void ref_tracker_dir_print(struct ref_tracker_dir *dir, { } +static inline int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, + char *buf, size_t size) +{ + return 0; +} + static inline int ref_tracker_alloc(struct ref_tracker_dir *dir, struct ref_tracker **trackerp, gfp_t gfp) diff --git a/lib/ref_tracker.c b/lib/ref_tracker.c index ab1253fde244ea..2ef4596b6b36f5 100644 --- a/lib/ref_tracker.c +++ b/lib/ref_tracker.c @@ -62,8 +62,27 @@ ref_tracker_get_stats(struct ref_tracker_dir *dir, unsigned int limit) return stats; } -void __ref_tracker_dir_print(struct ref_tracker_dir *dir, - unsigned int display_limit) +struct ostream { + char *buf; + int size, used; +}; + +#define pr_ostream(stream, fmt, args...) \ +({ \ + struct ostream *_s = (stream); \ +\ + if (!_s->buf) { \ + pr_err(fmt, ##args); \ + } else { \ + int ret, len = _s->size - _s->used; \ + ret = snprintf(_s->buf + _s->used, len, pr_fmt(fmt), ##args); \ + _s->used += min(ret, len); \ + } \ +}) + +static void +__ref_tracker_dir_pr_ostream(struct ref_tracker_dir *dir, + unsigned int display_limit, struct ostream *s) { struct ref_tracker_dir_stats *stats; unsigned int i = 0, skipped; @@ -77,8 +96,8 @@ void __ref_tracker_dir_print(struct ref_tracker_dir *dir, stats = ref_tracker_get_stats(dir, display_limit); if (IS_ERR(stats)) { - pr_err("%s@%pK: couldn't get stats, error %pe\n", - dir->name, dir, stats); + pr_ostream(s, "%s@%pK: couldn't get stats, error %pe\n", + dir->name, dir, stats); return; } @@ -88,19 +107,27 @@ void __ref_tracker_dir_print(struct ref_tracker_dir *dir, stack = stats->stacks[i].stack_handle; if (sbuf && !stack_depot_snprint(stack, sbuf, STACK_BUF_SIZE, 4)) sbuf[0] = 0; - pr_err("%s@%pK has %d/%d users at\n%s\n", dir->name, dir, - stats->stacks[i].count, stats->total, sbuf); + pr_ostream(s, "%s@%pK has %d/%d users at\n%s\n", dir->name, dir, + stats->stacks[i].count, stats->total, sbuf); skipped -= stats->stacks[i].count; } if (skipped) - pr_err("%s@%pK skipped reports about %d/%d users.\n", - dir->name, dir, skipped, stats->total); + pr_ostream(s, "%s@%pK skipped reports about %d/%d users.\n", + dir->name, dir, skipped, stats->total); kfree(sbuf); kfree(stats); } + +void __ref_tracker_dir_print(struct ref_tracker_dir *dir, + unsigned int display_limit) +{ + struct ostream os = {}; + + __ref_tracker_dir_pr_ostream(dir, display_limit, &os); +} EXPORT_SYMBOL(__ref_tracker_dir_print); void ref_tracker_dir_print(struct ref_tracker_dir *dir, @@ -114,6 +141,19 @@ void ref_tracker_dir_print(struct ref_tracker_dir *dir, } EXPORT_SYMBOL(ref_tracker_dir_print); +int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, char *buf, size_t size) +{ + struct ostream os = { .buf = buf, .size = size }; + unsigned long flags; + + spin_lock_irqsave(&dir->lock, flags); + __ref_tracker_dir_pr_ostream(dir, 16, &os); + spin_unlock_irqrestore(&dir->lock, flags); + + return os.used; +} +EXPORT_SYMBOL(ref_tracker_dir_snprint); + void ref_tracker_dir_exit(struct ref_tracker_dir *dir) { struct ref_tracker *tracker, *n;