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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 0B61CECE58C for ; Fri, 11 Oct 2019 12:39:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D573F206CD for ; Fri, 11 Oct 2019 12:39:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728139AbfJKMjm (ORCPT ); Fri, 11 Oct 2019 08:39:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49264 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727929AbfJKMjm (ORCPT ); Fri, 11 Oct 2019 08:39:42 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1CE6B10C092E; Fri, 11 Oct 2019 12:39:42 +0000 (UTC) Received: from bfoster (dhcp-41-2.bos.redhat.com [10.18.41.2]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8FE2F60BE1; Fri, 11 Oct 2019 12:39:41 +0000 (UTC) Date: Fri, 11 Oct 2019 08:39:39 -0400 From: Brian Foster To: Dave Chinner Cc: linux-xfs@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 04/26] xfs: Improve metadata buffer reclaim accountability Message-ID: <20191011123939.GD61257@bfoster> References: <20191009032124.10541-1-david@fromorbit.com> <20191009032124.10541-5-david@fromorbit.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191009032124.10541-5-david@fromorbit.com> User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.66]); Fri, 11 Oct 2019 12:39:42 +0000 (UTC) Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org Archived-At: List-Archive: List-Post: On Wed, Oct 09, 2019 at 02:21:02PM +1100, Dave Chinner wrote: > From: Dave Chinner > > The buffer cache shrinker frees more than just the xfs_buf slab > objects - it also frees the pages attached to the buffers. Make sure > the memory reclaim code accounts for this memory being freed > correctly, similar to how the inode shrinker accounts for pages > freed from the page cache due to mapping invalidation. > > We also need to make sure that the mm subsystem knows these are > reclaimable objects. We provide the memory reclaim subsystem with a > a shrinker to reclaim xfs_bufs, so we should really mark the slab > that way. > > We also have a lot of xfs_bufs in a busy system, spread them around > like we do inodes. > > Signed-off-by: Dave Chinner > --- Seems reasonable, but for inodes we also spread the ili zone. Should we not be consistent with bli's as well? Brian > fs/xfs/xfs_buf.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c > index e484f6bead53..45b470f55ad7 100644 > --- a/fs/xfs/xfs_buf.c > +++ b/fs/xfs/xfs_buf.c > @@ -324,6 +324,9 @@ xfs_buf_free( > > __free_page(page); > } > + if (current->reclaim_state) > + current->reclaim_state->reclaimed_slab += > + bp->b_page_count; > } else if (bp->b_flags & _XBF_KMEM) > kmem_free(bp->b_addr); > _xfs_buf_free_pages(bp); > @@ -2064,7 +2067,8 @@ int __init > xfs_buf_init(void) > { > xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf", > - KM_ZONE_HWALIGN, NULL); > + KM_ZONE_HWALIGN | KM_ZONE_SPREAD | KM_ZONE_RECLAIM, > + NULL); > if (!xfs_buf_zone) > goto out; > > -- > 2.23.0.rc1 >