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=-16.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 511F3C10F12 for ; Tue, 16 Apr 2019 03:00:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F5732075B for ; Tue, 16 Apr 2019 03:00:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="fnvln70V" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728485AbfDPDA0 (ORCPT ); Mon, 15 Apr 2019 23:00:26 -0400 Received: from mail-yw1-f73.google.com ([209.85.161.73]:47783 "EHLO mail-yw1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726775AbfDPDAX (ORCPT ); Mon, 15 Apr 2019 23:00:23 -0400 Received: by mail-yw1-f73.google.com with SMTP id z130so14630340ywb.14 for ; Mon, 15 Apr 2019 20:00:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=iuIeQUAMTWIOwz/+wMTVC2rJ1Jb9H2uzMsmhSpHr4CI=; b=fnvln70VUPw8oAUv8pSlp933t24EC4v+L98kvjdUpdJV4unSaz0qaOTJ4kDANowngl NtuNYmQdXEUi3aUzo8wfkTBm9Rrpk90shG1sf+UrhAN6KqHBmwdNI7Z6/j9GpEoVWfzO jDWNm0mGYxWzZIb+tLycnSLI2ii0+IfKuKfQW+JKVXoc7L+SW3yybK6t5eu+loHtcS7W 3OOE3krCnH+4rh0WORSthgLMvG9YtQakpQmGRlGVtUKvmw/P7uMY23GVkIuGwjA6yZYI pASm7Re41+k8ZTIqhR+fufOMSNYjSKowxRrqHebAZWwt98Kasc1teI2Xf/5UwSkeIFPP 0mGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=iuIeQUAMTWIOwz/+wMTVC2rJ1Jb9H2uzMsmhSpHr4CI=; b=k64gljzDsNRGcl3VBkQBuVFh5BHjJqUvkHbzBVdOg/CfhjAZv9mni4CNfCScLGDauk HgcIcOFU6cwGDCt42SSCNQ7WrxU9NVvEmlDjSCAeu2WX3pS7ZcI5QivnBCU7ZvVpZ2Oe EYer6KqVEmhuhfJffQ3dBqG/V/qtkESZbITcKkVGP80n/mVSwEgAqWrSyMvAkl2mWs7u glCVidJGJQa43X2P0LxyafmFhRXZ6EQbVynSLJbCXA6WjUdQVarb39Z0Vogxcnq2uHNn kSRMIWFd/P0OgL5AwkW1LOj2mcG0owEDQJTXmmn7Lsa7S7X4EJwBKCCWdOgXSup8Npa0 Ak/w== X-Gm-Message-State: APjAAAWaiHSGdaCvSYPj4cYKAP79kb/s67tduuXtJLAkKiSFJM3yHxji ZuVZU22YGqFqoAswwrMJ8BGimfS6NAE= X-Google-Smtp-Source: APXvYqxJ0n4CrJ+xX1bgAW5Q+EiNwMnYERC+ma2ULiuIf80Csy4LG8zlbeeW+APAZewrxoWS1g66vv4I9kA= X-Received: by 2002:a25:202:: with SMTP id 2mr14734788ybc.66.1555383622714; Mon, 15 Apr 2019 20:00:22 -0700 (PDT) Date: Mon, 15 Apr 2019 19:59:34 -0700 Message-Id: <20190416025934.115252-1-khazhy@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH] ext4: add cond_resched() to ext4_mb_init_backend() From: Khazhismel Kumykov To: tytso@mit.edu, adilger.kernel@dilger.ca Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, Khazhismel Kumykov Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org on non-preempt kernels for filesystems with large number of groups we may take a long time (>50 ticks) initializing all the groups. Signed-off-by: Khazhismel Kumykov --- fs/ext4/mballoc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 8ef5f12bbee2..c89f497ccf50 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2490,6 +2490,7 @@ static int ext4_mb_init_backend(struct super_block *sb) sbi->s_buddy_cache->i_ino = EXT4_BAD_INO; EXT4_I(sbi->s_buddy_cache)->i_disksize = 0; for (i = 0; i < ngroups; i++) { + cond_resched(); desc = ext4_get_group_desc(sb, i, NULL); if (desc == NULL) { ext4_msg(sb, KERN_ERR, "can't read descriptor %u", i); -- 2.21.0.392.gf8f6787159e-goog