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=-11.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 DD2AAC4727C for ; Thu, 1 Oct 2020 13:23:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9898720754 for ; Thu, 1 Oct 2020 13:23:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="LFOOnqqt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732331AbgJANX5 (ORCPT ); Thu, 1 Oct 2020 09:23:57 -0400 Received: from mx2.suse.de ([195.135.220.15]:42240 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731993AbgJANXw (ORCPT ); Thu, 1 Oct 2020 09:23:52 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1601558631; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=abH/w0iwll6KU2gOlHy3/m2zTXlTDNtR+9Osp3pdCeU=; b=LFOOnqqt7++ntrgwniVDjqbSJm+OZLJ5ya3mkcuXnOgOL9wkKvqJ0lrqPFrjFpmXeMK3hU L0dPysx+SCtx4Y3s5JHnLPeIpk19Ry0Tvxd6GWKmDpgWzAt5e3fb+ZVFODx96B3TrKhlXV xTUAilvXZg/qsu6IVU3cbJJ39e62OoA= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 03101ACF6; Thu, 1 Oct 2020 13:23:51 +0000 (UTC) Subject: Re: [PATCH 4/9] btrfs: check reclaim_size in need_preemptive_reclaim To: Josef Bacik , linux-btrfs@vger.kernel.org, kernel-team@fb.com References: <855a8376fa0d8e63e066ac323a985fe7bc1e562f.1601495426.git.josef@toxicpanda.com> From: Nikolay Borisov Autocrypt: addr=nborisov@suse.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <855a8376fa0d8e63e066ac323a985fe7bc1e562f.1601495426.git.josef@toxicpanda.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 30.09.20 г. 23:01 ч., Josef Bacik wrote: > If we're flushing space for tickets then we have > space_info->reclaim_size set and we do not need to do background > reclaim. > > Signed-off-by: Josef Bacik I'm fine with this but check my remak below. Reviewed-by: Nikolay Borisov > --- > fs/btrfs/space-info.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c > index 98207ea57a3d..518749093bc5 100644 > --- a/fs/btrfs/space-info.c > +++ b/fs/btrfs/space-info.c > @@ -805,6 +805,13 @@ static inline int need_preemptive_reclaim(struct btrfs_fs_info *fs_info, > if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh) > return 0; > > + /* > + * We have tickets queued, bail so we don't compete with the async > + * flushers. > + */ > + if (space_info->reclaim_size) > + return 0; > + nit: So where do we draw the line if this check should be in this function or in __reserve_bytes so that we eliminate the case where a preemptive reclaim is scheduled only to return instantly because of tickets. Though the 'if' in __reserve_bytes is getting slitghly out of hand :) > if (!btrfs_calc_reclaim_metadata_size(fs_info, space_info)) > return 0; > >