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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A969C2D0C6 for ; Wed, 11 Dec 2019 16:08:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3486320836 for ; Wed, 11 Dec 2019 16:08:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576080493; bh=w6+LJT6U0oDXDjKsTcFOsNGMxK4pxLYkXKPrdHk6E+0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HLo3pK7oXU8Si5bLu6vHDocyAGxGhsSQ7pWET3VLP9/FUapGjGi1dOXBnH7p0cuKO QDYsoL9eOMXUWVQT+y2DrCVWneqpb8+6DpHaOfbgQrtPRIxuSlktxxLV2bUTpvD9P0 jzAFc55YqKqRPaCLfuJz8yS3oI5mjyuBvcuvB2g8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731108AbfLKQIK (ORCPT ); Wed, 11 Dec 2019 11:08:10 -0500 Received: from mail.kernel.org ([198.145.29.99]:33804 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731103AbfLKPMV (ORCPT ); Wed, 11 Dec 2019 10:12:21 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 612372465E; Wed, 11 Dec 2019 15:12:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576077141; bh=w6+LJT6U0oDXDjKsTcFOsNGMxK4pxLYkXKPrdHk6E+0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xx+HrnRlbgty5ATZmAN+dQyWVEiK8A08B6BGa2B3BF4r1n53QnEmc+pGVpXzMdriq aiOffxnyhXxg7ZLaAWimTx97h/IJysPkiNYWha9DwP3VFjJWEiw3YP6c/XeY25PSUh 6OQbKinWZHaBfljW5CGBe2itm5T0oMM/jnwvyGow= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Eric Dumazet , Corentin Labbe , Christoph Hellwig , Marek Szyprowski , Sasha Levin Subject: [PATCH AUTOSEL 5.4 028/134] dma-debug: add a schedule point in debug_dma_dump_mappings() Date: Wed, 11 Dec 2019 10:10:04 -0500 Message-Id: <20191211151150.19073-28-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191211151150.19073-1-sashal@kernel.org> References: <20191211151150.19073-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Eric Dumazet [ Upstream commit 9ff6aa027dbb98755f0265695354f2dd07c0d1ce ] debug_dma_dump_mappings() can take a lot of cpu cycles : lpk43:/# time wc -l /sys/kernel/debug/dma-api/dump 163435 /sys/kernel/debug/dma-api/dump real 0m0.463s user 0m0.003s sys 0m0.459s Let's add a cond_resched() to avoid holding cpu for too long. Signed-off-by: Eric Dumazet Cc: Corentin Labbe Cc: Christoph Hellwig Cc: Marek Szyprowski Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- kernel/dma/debug.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 099002d84f466..4ad74f5987ea9 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -420,6 +420,7 @@ void debug_dma_dump_mappings(struct device *dev) } spin_unlock_irqrestore(&bucket->lock, flags); + cond_resched(); } } -- 2.20.1