[v5,04/10] ceph: add global read latency metric support

Message ID	20200128130248.4266-5-xiubli@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=zLTk=3R=vger.kernel.org=ceph-devel-owner@kernel.org> From: xiubli@redhat.com To: jlayton@kernel.org, idryomov@gmail.com, zyan@redhat.com Cc: sage@redhat.com, pdonnell@redhat.com, ceph-devel@vger.kernel.org, Xiubo Li <xiubli@redhat.com> Subject: [PATCH v5 04/10] ceph: add global read latency metric support Date: Tue, 28 Jan 2020 08:02:42 -0500 Message-Id: <20200128130248.4266-5-xiubli@redhat.com> In-Reply-To: <20200128130248.4266-1-xiubli@redhat.com> References: <20200128130248.4266-1-xiubli@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: ceph-devel-owner@vger.kernel.org Precedence: bulk
Series	ceph: add perf metrics support \| expand [v5,0/10] ceph: add perf metrics support [v5,01/10] ceph: add caps perf metric for each session [v5,02/10] ceph: move ceph_osdc_{read,write}pages to ceph.ko [v5,03/10] ceph: add r_end_stamp for the osdc request [v5,04/10] ceph: add global read latency metric support [v5,05/10] ceph: add global write latency metric support [v5,06/10] ceph: add global metadata perf metric support [v5,07/10] ceph: periodically send perf metrics to MDS [v5,08/10] ceph: add CEPH_DEFINE_RW_FUNC helper support [v5,09/10] ceph: add reset metrics support [v5,10/10] ceph: send client provided metric flags in client metadata

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 20e5ebfff389..0435a694370b 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -195,6 +195,7 @@ static int ceph_sync_readpages(struct ceph_fs_client *fsc, int page_align) { struct ceph_osd_client *osdc = &fsc->client->osdc; + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_osd_request *req; int rc = 0; @@ -218,6 +219,8 @@ static int ceph_sync_readpages(struct ceph_fs_client *fsc, if (!rc) rc = ceph_osdc_wait_request(osdc, req); + ceph_update_read_latency(metric, req, rc); + ceph_osdc_put_request(req); dout("readpages result %d\n", rc); return rc; @@ -301,6 +304,8 @@ static int ceph_readpage(struct file *filp, struct page *page) static void finish_read(struct ceph_osd_request *req) { struct inode *inode = req->r_inode; + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_osd_data *osd_data; int rc = req->r_result <= 0 ? req->r_result : 0; int bytes = req->r_result >= 0 ? req->r_result : 0; @@ -338,6 +343,9 @@ static void finish_read(struct ceph_osd_request *req) put_page(page); bytes -= PAGE_SIZE; } + + ceph_update_read_latency(metric, req, rc); + kfree(osd_data->pages); } diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index c132fdb40d53..f8a32fa335ae 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -128,8 +128,19 @@ static int metric_show(struct seq_file *s, void *p) { struct ceph_fs_client *fsc = s->private; struct ceph_mds_client *mdsc = fsc->mdsc; + s64 total, sum, avg = 0; int i; + seq_printf(s, "item total sum_lat(us) avg_lat(us)\n"); + seq_printf(s, "-----------------------------------------------------\n"); + + total = percpu_counter_sum(&mdsc->metric.total_reads); + sum = percpu_counter_sum(&mdsc->metric.read_latency_sum); + avg = total ? sum / total : 0; + seq_printf(s, "%-14s%-12lld%-16lld%lld\n", "read", + total, sum / NSEC_PER_USEC, avg / NSEC_PER_USEC); + + seq_printf(s, "\n"); seq_printf(s, "item total miss hit\n"); seq_printf(s, "-------------------------------------------------\n"); diff --git a/fs/ceph/file.c b/fs/ceph/file.c index c78dfbbb7b91..69288c39229b 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -588,6 +588,7 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_osd_client *osdc = &fsc->client->osdc; ssize_t ret; u64 off = iocb->ki_pos; @@ -660,6 +661,9 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to, ret = ceph_osdc_start_request(osdc, req, false); if (!ret) ret = ceph_osdc_wait_request(osdc, req); + + ceph_update_read_latency(metric, req, ret); + ceph_osdc_put_request(req); i_size = i_size_read(inode); @@ -798,13 +802,20 @@ static void ceph_aio_complete_req(struct ceph_osd_request *req) struct inode *inode = req->r_inode; struct ceph_aio_request *aio_req = req->r_priv; struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS); BUG_ON(!osd_data->num_bvecs); + BUG_ON(!aio_req); dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, osd_data->bvec_pos.iter.bi_size); + /* r_start_stamp == 0 means the request was not submitted */ + if (req->r_start_stamp && !aio_req->write) + ceph_update_read_latency(metric, req, rc); + if (rc == -EOLDSNAPC) { struct ceph_aio_work *aio_work; BUG_ON(!aio_req->write); @@ -933,6 +944,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_client_metric *metric = &fsc->mdsc->metric; struct ceph_vino vino; struct ceph_osd_request *req; struct bio_vec *bvecs; @@ -1049,6 +1061,9 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter, if (!ret) ret = ceph_osdc_wait_request(&fsc->client->osdc, req); + if (!write) + ceph_update_read_latency(metric, req, ret); + size = i_size_read(inode); if (!write) { if (ret == -ENOENT) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 141c1c03636c..101b51f9f05d 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -4182,14 +4182,29 @@ static int ceph_mdsc_metric_init(struct ceph_client_metric *metric) atomic64_set(&metric->total_dentries, 0); ret = percpu_counter_init(&metric->d_lease_hit, 0, GFP_KERNEL); if (ret) - return ret; + return ret;; ret = percpu_counter_init(&metric->d_lease_mis, 0, GFP_KERNEL); - if (ret) { - percpu_counter_destroy(&metric->d_lease_hit); - return ret; - } + if (ret) + goto err_dlease_mis; - return 0; + ret = percpu_counter_init(&metric->total_reads, 0, GFP_KERNEL); + if (ret) + goto err_total_reads; + + ret = percpu_counter_init(&metric->read_latency_sum, 0, GFP_KERNEL); + if (ret) + goto err_read_latency_sum; + + return ret; + +err_read_latency_sum: + percpu_counter_destroy(&metric->total_reads); +err_total_reads: + percpu_counter_destroy(&metric->d_lease_mis); +err_dlease_mis: + percpu_counter_destroy(&metric->d_lease_hit); + + return ret; } int ceph_mdsc_init(struct ceph_fs_client *fsc) @@ -4529,6 +4544,8 @@ void ceph_mdsc_destroy(struct ceph_fs_client *fsc) ceph_mdsc_stop(mdsc); + percpu_counter_destroy(&mdsc->metric.read_latency_sum); + percpu_counter_destroy(&mdsc->metric.total_reads); percpu_counter_destroy(&mdsc->metric.d_lease_mis); percpu_counter_destroy(&mdsc->metric.d_lease_hit); diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index ba74ff74c59c..574d4e5a5de2 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -16,6 +16,8 @@ #include <linux/ceph/mdsmap.h> #include <linux/ceph/auth.h> +#include "metric.h" + /* The first 8 bits are reserved for old ceph releases */ enum ceph_feature_type { CEPHFS_FEATURE_MIMIC = 8, @@ -361,13 +363,6 @@ struct cap_wait { int want; }; -/* This is the global metrics */ -struct ceph_client_metric { - atomic64_t total_dentries; - struct percpu_counter d_lease_hit; - struct percpu_counter d_lease_mis; -}; - /* * mds client state */ diff --git a/fs/ceph/metric.h b/fs/ceph/metric.h new file mode 100644 index 000000000000..2a7b8f3fe6a4 --- /dev/null +++ b/fs/ceph/metric.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _FS_CEPH_MDS_METRIC_H +#define _FS_CEPH_MDS_METRIC_H + +#include <linux/ceph/osd_client.h> + +/* This is the global metrics */ +struct ceph_client_metric { + atomic64_t total_dentries; + struct percpu_counter d_lease_hit; + struct percpu_counter d_lease_mis; + + struct percpu_counter total_reads; + struct percpu_counter read_latency_sum; +}; + +static inline void ceph_update_read_latency(struct ceph_client_metric *m, + struct ceph_osd_request *req, + int rc) +{ + if (!m || !req) + return; + + if (rc >= 0 || rc == -ENOENT || rc == -ETIMEDOUT) { + s64 latency = req->r_end_stamp - req->r_start_stamp; + percpu_counter_inc(&m->total_reads); + percpu_counter_add(&m->read_latency_sum, latency); + } +} +#endif

[v5,04/10] ceph: add global read latency metric support

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