Commit 97e27aaa authored by Xiubo Li's avatar Xiubo Li Committed by Ilya Dryomov
Browse files

ceph: add read/write latency metric support 

Calculate the latency for OSD read requests. Add a new r_end_stamp
field to struct ceph_osd_request that will hold the time of that
the reply was received. Use that to calculate the RTT for each call,
and divide the sum of those by number of calls to get averate RTT.

Keep a tally of RTT for OSD writes and number of calls to track average
latency of OSD writes.

URL: https://tracker.ceph.com/issues/43215


Signed-off-by: default avatarXiubo Li <xiubli@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
parent 1af16d54

fs/ceph/addr.c

+20 −0
Original line number Diff line number Diff line
@@ -11,10 +11,12 @@ 
#include <linux/task_io_accounting_ops.h>

#include <linux/signal.h>

#include <linux/iversion.h>

#include <linux/ktime.h>



#include "super.h"

#include "mds_client.h"

#include "cache.h"

#include "metric.h"

#include <linux/ceph/osd_client.h>

#include <linux/ceph/striper.h>
@@ -216,6 +218,9 @@ static int ceph_sync_readpages(struct ceph_fs_client *fsc, 
	if (!rc)

		rc = ceph_osdc_wait_request(osdc, req);



	ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency,

				 req->r_end_latency, rc);



	ceph_osdc_put_request(req);

	dout("readpages result %d\n", rc);

	return rc;
@@ -299,6 +304,7 @@ 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_osd_data *osd_data;

	int rc = req->r_result <= 0 ? req->r_result : 0;

	int bytes = req->r_result >= 0 ? req->r_result : 0;
@@ -336,6 +342,10 @@ unlock: 
		put_page(page);

		bytes -= PAGE_SIZE;

	}



	ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency,

				 req->r_end_latency, rc);



	kfree(osd_data->pages);

}
@@ -643,6 +653,9 @@ static int ceph_sync_writepages(struct ceph_fs_client *fsc, 
	if (!rc)

		rc = ceph_osdc_wait_request(osdc, req);



	ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,

				  req->r_end_latency, rc);



	ceph_osdc_put_request(req);

	if (rc == 0)

		rc = len;
@@ -794,6 +807,9 @@ static void writepages_finish(struct ceph_osd_request *req) 
		ceph_clear_error_write(ci);

	}



	ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,

				  req->r_end_latency, rc);



	/*

	 * We lost the cache cap, need to truncate the page before

	 * it is unlocked, otherwise we'd truncate it later in the
@@ -1852,6 +1868,10 @@ int ceph_uninline_data(struct file *filp, struct page *locked_page) 
	err = ceph_osdc_start_request(&fsc->client->osdc, req, false);

	if (!err)

		err = ceph_osdc_wait_request(&fsc->client->osdc, req);



	ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,

				  req->r_end_latency, err);



out_put:

	ceph_osdc_put_request(req);

	if (err == -ECANCELED)

fs/ceph/debugfs.c

+42 −1
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ 
#include <linux/ctype.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/math64.h>

#include <linux/ktime.h>



#include <linux/ceph/libceph.h>

#include <linux/ceph/mon_client.h>
@@ -18,6 +20,7 @@ 
#ifdef CONFIG_DEBUG_FS



#include "mds_client.h"

#include "metric.h"



static int mdsmap_show(struct seq_file *s, void *p)

{
@@ -124,13 +127,51 @@ static int mdsc_show(struct seq_file *s, void *p) 
	return 0;

}



#define CEPH_METRIC_SHOW(name, total, avg, min, max, sq) {		\

	s64 _total, _avg, _min, _max, _sq, _st;				\

	_avg = ktime_to_us(avg);					\

	_min = ktime_to_us(min == KTIME_MAX ? 0 : min);			\

	_max = ktime_to_us(max);					\

	_total = total - 1;						\

	_sq = _total > 0 ? DIV64_U64_ROUND_CLOSEST(sq, _total) : 0;	\

	_st = int_sqrt64(_sq);						\

	_st = ktime_to_us(_st);						\

	seq_printf(s, "%-14s%-12lld%-16lld%-16lld%-16lld%lld\n",	\

		   name, total, _avg, _min, _max, _st);			\

}



static int metric_show(struct seq_file *s, void *p)

{

	struct ceph_fs_client *fsc = s->private;

	struct ceph_mds_client *mdsc = fsc->mdsc;

	struct ceph_client_metric *m = &mdsc->metric;

	int i, nr_caps = 0;



	s64 total, sum, avg, min, max, sq;



	seq_printf(s, "item          total       avg_lat(us)     min_lat(us)     max_lat(us)     stdev(us)\n");

	seq_printf(s, "-----------------------------------------------------------------------------------\n");



	spin_lock(&m->read_latency_lock);

	total = m->total_reads;

	sum = m->read_latency_sum;

	avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;

	min = m->read_latency_min;

	max = m->read_latency_max;

	sq = m->read_latency_sq_sum;

	spin_unlock(&m->read_latency_lock);

	CEPH_METRIC_SHOW("read", total, avg, min, max, sq);



	spin_lock(&m->write_latency_lock);

	total = m->total_writes;

	sum = m->write_latency_sum;

	avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;

	min = m->write_latency_min;

	max = m->write_latency_max;

	sq = m->write_latency_sq_sum;

	spin_unlock(&m->write_latency_lock);

	CEPH_METRIC_SHOW("write", total, avg, min, max, sq);



	seq_printf(s, "\n");

	seq_printf(s, "item          total           miss            hit\n");

	seq_printf(s, "-------------------------------------------------\n");

fs/ceph/file.c

+30 −0
Original line number Diff line number Diff line
@@ -11,11 +11,13 @@ 
#include <linux/writeback.h>

#include <linux/falloc.h>

#include <linux/iversion.h>

#include <linux/ktime.h>



#include "super.h"

#include "mds_client.h"

#include "cache.h"

#include "io.h"

#include "metric.h"



static __le32 ceph_flags_sys2wire(u32 flags)

{
@@ -906,6 +908,12 @@ 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(&fsc->mdsc->metric,

					 req->r_start_latency,

					 req->r_end_latency,

					 ret);



		ceph_osdc_put_request(req);



		i_size = i_size_read(inode);
@@ -1044,6 +1052,8 @@ 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);
@@ -1051,6 +1061,16 @@ static void ceph_aio_complete_req(struct ceph_osd_request *req) 
	dout("ceph_aio_complete_req %p rc %d bytes %u\n",

	     inode, rc, osd_data->bvec_pos.iter.bi_size);



	/* r_start_latency == 0 means the request was not submitted */

	if (req->r_start_latency) {

		if (aio_req->write)

			ceph_update_write_latency(metric, req->r_start_latency,

						  req->r_end_latency, rc);

		else

			ceph_update_read_latency(metric, req->r_start_latency,

						 req->r_end_latency, rc);

	}



	if (rc == -EOLDSNAPC) {

		struct ceph_aio_work *aio_work;

		BUG_ON(!aio_req->write);
@@ -1179,6 +1199,7 @@ 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;
@@ -1295,6 +1316,13 @@ 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_write_latency(metric, req->r_start_latency,

						  req->r_end_latency, ret);

		else

			ceph_update_read_latency(metric, req->r_start_latency,

						 req->r_end_latency, ret);



		size = i_size_read(inode);

		if (!write) {

			if (ret == -ENOENT)
@@ -1466,6 +1494,8 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, 
		if (!ret)

			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);



		ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,

					  req->r_end_latency, ret);

out:

		ceph_osdc_put_request(req);

		if (ret != 0) {

fs/ceph/metric.c

+72 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 


#include <linux/types.h>

#include <linux/percpu_counter.h>

#include <linux/math64.h>



#include "metric.h"
@@ -29,6 +30,20 @@ int ceph_metric_init(struct ceph_client_metric *m) 
	if (ret)

		goto err_i_caps_mis;



	spin_lock_init(&m->read_latency_lock);

	m->read_latency_sq_sum = 0;

	m->read_latency_min = KTIME_MAX;

	m->read_latency_max = 0;

	m->total_reads = 0;

	m->read_latency_sum = 0;



	spin_lock_init(&m->write_latency_lock);

	m->write_latency_sq_sum = 0;

	m->write_latency_min = KTIME_MAX;

	m->write_latency_max = 0;

	m->total_writes = 0;

	m->write_latency_sum = 0;



	return 0;



err_i_caps_mis:
@@ -51,3 +66,60 @@ void ceph_metric_destroy(struct ceph_client_metric *m) 
	percpu_counter_destroy(&m->d_lease_mis);

	percpu_counter_destroy(&m->d_lease_hit);

}



static inline void __update_latency(ktime_t *totalp, ktime_t *lsump,

				    ktime_t *min, ktime_t *max,

				    ktime_t *sq_sump, ktime_t lat)

{

	ktime_t total, avg, sq, lsum;



	total = ++(*totalp);

	lsum = (*lsump += lat);



	if (unlikely(lat < *min))

		*min = lat;

	if (unlikely(lat > *max))

		*max = lat;



	if (unlikely(total == 1))

		return;



	/* the sq is (lat - old_avg) * (lat - new_avg) */

	avg = DIV64_U64_ROUND_CLOSEST((lsum - lat), (total - 1));

	sq = lat - avg;

	avg = DIV64_U64_ROUND_CLOSEST(lsum, total);

	sq = sq * (lat - avg);

	*sq_sump += sq;

}



void ceph_update_read_latency(struct ceph_client_metric *m,

			      ktime_t r_start, ktime_t r_end,

			      int rc)

{

	ktime_t lat = ktime_sub(r_end, r_start);



	if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))

		return;



	spin_lock(&m->read_latency_lock);

	__update_latency(&m->total_reads, &m->read_latency_sum,

			 &m->read_latency_min, &m->read_latency_max,

			 &m->read_latency_sq_sum, lat);

	spin_unlock(&m->read_latency_lock);

}



void ceph_update_write_latency(struct ceph_client_metric *m,

			       ktime_t r_start, ktime_t r_end,

			       int rc)

{

	ktime_t lat = ktime_sub(r_end, r_start);



	if (unlikely(rc && rc != -ETIMEDOUT))

		return;



	spin_lock(&m->write_latency_lock);

	__update_latency(&m->total_writes, &m->write_latency_sum,

			 &m->write_latency_min, &m->write_latency_max,

			 &m->write_latency_sq_sum, lat);

	spin_unlock(&m->write_latency_lock);

}

fs/ceph/metric.h

+22 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


#include <linux/types.h>

#include <linux/percpu_counter.h>

#include <linux/ktime.h>



/* This is the global metrics */

struct ceph_client_metric {
@@ -13,6 +14,20 @@ struct ceph_client_metric { 


	struct percpu_counter i_caps_hit;

	struct percpu_counter i_caps_mis;



	spinlock_t read_latency_lock;

	u64 total_reads;

	ktime_t read_latency_sum;

	ktime_t read_latency_sq_sum;

	ktime_t read_latency_min;

	ktime_t read_latency_max;



	spinlock_t write_latency_lock;

	u64 total_writes;

	ktime_t write_latency_sum;

	ktime_t write_latency_sq_sum;

	ktime_t write_latency_min;

	ktime_t write_latency_max;

};



extern int ceph_metric_init(struct ceph_client_metric *m);
@@ -27,4 +42,11 @@ static inline void ceph_update_cap_mis(struct ceph_client_metric *m) 
{

	percpu_counter_inc(&m->i_caps_mis);

}



extern void ceph_update_read_latency(struct ceph_client_metric *m,

				     ktime_t r_start, ktime_t r_end,

				     int rc);

extern void ceph_update_write_latency(struct ceph_client_metric *m,

				      ktime_t r_start, ktime_t r_end,

				      int rc);

#endif /* _FS_CEPH_MDS_METRIC_H */

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