From patchwork Wed Jun 22 14:13:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever III X-Patchwork-Id: 12890765 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE9F1C43334 for ; Wed, 22 Jun 2022 14:14:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358280AbiFVOOL (ORCPT ); Wed, 22 Jun 2022 10:14:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358290AbiFVONs (ORCPT ); Wed, 22 Jun 2022 10:13:48 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D1199BAF; Wed, 22 Jun 2022 07:13:47 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6BDB561B71; Wed, 22 Jun 2022 14:13:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70DB3C34114; Wed, 22 Jun 2022 14:13:46 +0000 (UTC) Subject: [PATCH RFC 09/30] NFSD: Record number of flush calls From: Chuck Lever To: linux-nfs@vger.kernel.org, netdev@vger.kernel.org Cc: david@fromorbit.com, tgraf@suug.ch, jlayton@redhat.com Date: Wed, 22 Jun 2022 10:13:45 -0400 Message-ID: <165590722535.75778.7826105117559897405.stgit@manet.1015granger.net> In-Reply-To: <165590626293.75778.9843437418112335153.stgit@manet.1015granger.net> References: <165590626293.75778.9843437418112335153.stgit@manet.1015granger.net> User-Agent: StGit/1.5.dev2+g9ce680a5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-State: RFC Signed-off-by: Chuck Lever --- fs/nfsd/filecache.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c index d597acfdab28..cae7fa2343c1 100644 --- a/fs/nfsd/filecache.c +++ b/fs/nfsd/filecache.c @@ -45,6 +45,7 @@ struct nfsd_fcache_bucket { static DEFINE_PER_CPU(unsigned long, nfsd_file_cache_hits); static DEFINE_PER_CPU(unsigned long, nfsd_file_acquisitions); static DEFINE_PER_CPU(unsigned long, nfsd_file_releases); +static DEFINE_PER_CPU(unsigned long, nfsd_file_pages_flushed); static DEFINE_PER_CPU(unsigned long, nfsd_file_evictions); struct nfsd_fcache_disposal { @@ -249,7 +250,12 @@ nfsd_file_check_write_error(struct nfsd_file *nf) static void nfsd_file_flush(struct nfsd_file *nf) { - if (nf->nf_file && vfs_fsync(nf->nf_file, 1) != 0) + struct file *file = nf->nf_file; + + if (!file || !(file->f_mode & FMODE_WRITE)) + return; + this_cpu_add(nfsd_file_pages_flushed, file->f_mapping->nrpages); + if (vfs_fsync(file, 1) != 0) nfsd_reset_write_verifier(net_generic(nf->nf_net, nfsd_net_id)); } @@ -1091,7 +1097,8 @@ nfsd_file_create(struct svc_rqst *rqstp, struct svc_fh *fhp, */ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) { - unsigned long hits = 0, acquisitions = 0, releases = 0, evictions = 0; + unsigned long releases = 0, pages_flushed = 0, evictions = 0; + unsigned long hits = 0, acquisitions = 0; unsigned int i, count = 0, longest = 0; /* @@ -1113,6 +1120,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) acquisitions += per_cpu(nfsd_file_acquisitions, i); releases += per_cpu(nfsd_file_releases, i); evictions += per_cpu(nfsd_file_evictions, i); + pages_flushed += per_cpu(nfsd_file_pages_flushed, i); } seq_printf(m, "total entries: %u\n", count); @@ -1127,6 +1135,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v) atomic_long_read(&nfsd_file_total_age) / releases); else seq_printf(m, "mean age (ms): -\n"); + seq_printf(m, "pages flushed: %lu\n", pages_flushed); return 0; }