From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-99.freemail.mail.aliyun.com (out30-99.freemail.mail.aliyun.com [115.124.30.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0CDEC12BE8F for ; Wed, 31 Jan 2024 17:17:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.99 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706721476; cv=none; b=Gobmz4dphQLi5DNSG+cKQR2yeGLV8Z+9zOm0JFnC1aW5zz07M9XctEY+kI6K+N1U/3wqUXxG46p5SSd6DP4cpdpeld/Qha1uWo0jEhmjhXEFI2NEbvGAZnWFyrx5uQ8stibySA6Vu91uJ2vwFERKRZXwK8fa6qcwy7KbqJGWRuQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706721476; c=relaxed/simple; bh=xDWbSj+lWcUFeXVwKmzyveEoDYPjena42XWOP2OB/2g=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=qZ3uB4tV565+mETQDIw1lBIdDJyGOh4DqZHNf/78dw6PWNMb2x8bsuhP/OsIBBDWwtTtLVgLomuTBVZ1KvQxVg2jJyCUbI4GjC7rfbxN7K+BBKhWB6wGg4mM/qfj8k96bpf6Hf0OjOgfnpm29mYuUaLVSdb0zS6wouLyGtvukrQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=Jp7Fvhl8; arc=none smtp.client-ip=115.124.30.99 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="Jp7Fvhl8" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1706721464; h=From:To:Subject:Date:Message-Id:MIME-Version:Content-Type; bh=iJAyliH1jmGlDN9SYN3BWB7VVtP7e8HnSMJHDLoyYew=; b=Jp7Fvhl8epCn3qowKBxyy2pb6/iE1dlwhVda7ue0qmQydlI6JqS8EWWEu7x7Ou1jak+4tLuhK6wPuoOhntJK/D9PQOOv7YFLIqDuXL8bkW5BXMB5lEUvDMBOqg668Q64wzGZ4gzxDwy4EGyDsMnaUODNe/zHEJzk87tF1j/FPGc= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R811e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046050;MF=yaoma@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0W.kJfU8_1706721462; Received: from localhost.localdomain(mailfrom:yaoma@linux.alibaba.com fp:SMTPD_---0W.kJfU8_1706721462) by smtp.aliyun-inc.com; Thu, 01 Feb 2024 01:17:43 +0800 From: Bitao Hu To: dianders@chromium.org, akpm@linux-foundation.org, pmladek@suse.com, kernelfans@gmail.com, liusong@linux.alibaba.com Cc: linux-kernel@vger.kernel.org, yaoma@linux.alibaba.com Subject: [PATCHv3 0/2] *** Detect interrupt storm in softlockup *** Date: Thu, 1 Feb 2024 01:17:36 +0800 Message-Id: <20240131171738.35496-1-yaoma@linux.alibaba.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi, guys. I have implemented a low-overhead method for detecting interrupt storm in softlockup. Please review it, all comments are welcome. Changes from v2 to v3: - From Liu Song, using enum instead of macro for cpu_stats, shortening the name 'idx_to_stat' to 'stats', adding 'get_16bit_precesion' instead of using right shift operations, and using 'struct irq_counts'. - From kernel robot test, using '__this_cpu_read' and '__this_cpu_write' instead of accessing to an per-cpu array directly, in order to avoid this warning. 'sparse: incorrect type in initializer (different modifiers)' Changes from v1 to v2: - From Douglas, optimize the memory of cpustats. With the maximum number of CPUs, that's now this. 2 * 8192 * 4 + 1 * 8192 * 5 * 4 + 1 * 8192 = 237,568 bytes. - From Liu Song, refactor the code format and add necessary comments. - From Douglas, use interrupt counts instead of interrupt time to determine the cause of softlockup. - Remove the cmdline parameter added in PATCHv1. Bitao Hu (2): watchdog/softlockup: low-overhead detection of interrupt storm watchdog/softlockup: report the most frequent interrupts kernel/watchdog.c | 240 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 240 insertions(+) -- 2.37.1 (Apple Git-137.1)