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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 50CC1C47095 for ; Fri, 2 Oct 2020 15:34:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 19137208B6 for ; Fri, 2 Oct 2020 15:34:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="JRGeUFhC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388093AbgJBPeF (ORCPT ); Fri, 2 Oct 2020 11:34:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:41475 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388115AbgJBPeC (ORCPT ); Fri, 2 Oct 2020 11:34:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1601652841; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JHcJj36zHRiJ6bf9ie64HvlM0zB1bc0CCjKGLinsI3c=; b=JRGeUFhCO4ocpKwB3nrXNCIpsddKVTQj4dNfdNQkK+2s0oBRrf0O/eCiDp40f/o+gJrX0m Milo2LVypN2gVU1W2i80mDPDO/8BeapWTD4UzL3I+K6WL7kwqQAz92pHnTS7TbxhXbRdBx LMqqq9SZ2evN+frYDHYlVpxbrFLFa9k= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-424-1lolfs79NimJdh0iFAzocQ-1; Fri, 02 Oct 2020 11:34:00 -0400 X-MC-Unique: 1lolfs79NimJdh0iFAzocQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 337AC801AFB; Fri, 2 Oct 2020 15:33:59 +0000 (UTC) Received: from bfoster.redhat.com (ovpn-114-177.rdu2.redhat.com [10.10.114.177]) by smtp.corp.redhat.com (Postfix) with ESMTP id CC8AB78813; Fri, 2 Oct 2020 15:33:58 +0000 (UTC) From: Brian Foster To: linux-fsdevel@vger.kernel.org Cc: linux-xfs@vger.kernel.org Subject: [PATCH 2/2] xfs: kick extra large ioends to completion workqueue Date: Fri, 2 Oct 2020 11:33:57 -0400 Message-Id: <20201002153357.56409-3-bfoster@redhat.com> In-Reply-To: <20201002153357.56409-1-bfoster@redhat.com> References: <20201002153357.56409-1-bfoster@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org We've had reports of soft lockup warnings in the iomap ioend completion path due to very large bios and/or bio chains. Divert any ioends with 256k or more pages to process to the workqueue so completion occurs in non-atomic context and can reschedule to avoid soft lockup warnings. Signed-off-by: Brian Foster --- fs/xfs/xfs_aops.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 3e061ea99922..84ee917014f1 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -30,6 +30,13 @@ XFS_WPC(struct iomap_writepage_ctx *ctx) return container_of(ctx, struct xfs_writepage_ctx, ctx); } +/* + * Kick extra large ioends off to the workqueue. Completion will process a lot + * of pages for a large bio or bio chain and a non-atomic context is required to + * reschedule and avoid soft lockup warnings. + */ +#define XFS_LARGE_IOEND (262144 << PAGE_SHIFT) + /* * Fast and loose check if this write could update the on-disk inode size. */ @@ -239,7 +246,8 @@ static inline bool xfs_ioend_needs_workqueue(struct iomap_ioend *ioend) { return ioend->io_private || ioend->io_type == IOMAP_UNWRITTEN || - (ioend->io_flags & IOMAP_F_SHARED); + (ioend->io_flags & IOMAP_F_SHARED) || + (ioend->io_size >= XFS_LARGE_IOEND); } STATIC void -- 2.25.4