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ceph: clean-up metrics data structures to reduce code duplication

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This patch modifies struct ceph_client_metric so that each metric block
(read, write and metadata) becomes an element in a array.  This allows to
also re-write the helper functions that handle these blocks, making them
simpler and, above all, reduce the amount of copy&paste every time a new
metric is added.

Thus, for each of these metrics there will be a new struct ceph_metric
entry that'll will contain all the sizes and latencies fields (and a lock).
Note however that the metadata metric doesn't really use the size_fields,
and thus this metric won't be shown in the debugfs '../metrics/size' file.

Signed-off-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luís Henriques 2021-10-29 15:09:28 +01:00 committed by Ilya Dryomov
parent cbed4ff76b
commit 17e9fc9fca
3 changed files with 115 additions and 180 deletions
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87
fs/ceph/debugfs.c
View file

@ -164,44 +164,34 @@ static int metrics_file_show(struct seq_file *s, void *p)
return 0;
}
static const char * const metric_str[] = {
"read",
"write",
"metadata"
};
static int metrics_latency_show(struct seq_file *s, void *p)
{
struct ceph_fs_client *fsc = s->private;
struct ceph_client_metric *m = &fsc->mdsc->metric;
struct ceph_client_metric *cm = &fsc->mdsc->metric;
struct ceph_metric *m;
s64 total, sum, avg, min, max, sq;
int i;
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_metric_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_metric_lock);
CEPH_LAT_METRIC_SHOW("read", total, avg, min, max, sq);
spin_lock(&m->write_metric_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_metric_lock);
CEPH_LAT_METRIC_SHOW("write", total, avg, min, max, sq);
spin_lock(&m->metadata_metric_lock);
total = m->total_metadatas;
sum = m->metadata_latency_sum;
avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
min = m->metadata_latency_min;
max = m->metadata_latency_max;
sq = m->metadata_latency_sq_sum;
spin_unlock(&m->metadata_metric_lock);
CEPH_LAT_METRIC_SHOW("metadata", total, avg, min, max, sq);
for (i = 0; i < METRIC_MAX; i++) {
m = &cm->metric[i];
spin_lock(&m->lock);
total = m->total;
sum = m->latency_sum;
avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
min = m->latency_min;
max = m->latency_max;
sq = m->latency_sq_sum;
spin_unlock(&m->lock);
CEPH_LAT_METRIC_SHOW(metric_str[i], total, avg, min, max, sq);
}
return 0;
}
@ -209,30 +199,29 @@ static int metrics_latency_show(struct seq_file *s, void *p)
static int metrics_size_show(struct seq_file *s, void *p)
{
struct ceph_fs_client *fsc = s->private;
struct ceph_client_metric *m = &fsc->mdsc->metric;
struct ceph_client_metric *cm = &fsc->mdsc->metric;
struct ceph_metric *m;
s64 total;
u64 sum_sz, avg_sz, min_sz, max_sz;
u64 sum, avg, min, max;
int i;
seq_printf(s, "item total avg_sz(bytes) min_sz(bytes) max_sz(bytes) total_sz(bytes)\n");
seq_printf(s, "----------------------------------------------------------------------------------------\n");
spin_lock(&m->read_metric_lock);
total = m->total_reads;
sum_sz = m->read_size_sum;
avg_sz = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum_sz, total) : 0;
min_sz = m->read_size_min;
max_sz = m->read_size_max;
spin_unlock(&m->read_metric_lock);
CEPH_SZ_METRIC_SHOW("read", total, avg_sz, min_sz, max_sz, sum_sz);
spin_lock(&m->write_metric_lock);
total = m->total_writes;
sum_sz = m->write_size_sum;
avg_sz = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum_sz, total) : 0;
min_sz = m->write_size_min;
max_sz = m->write_size_max;
spin_unlock(&m->write_metric_lock);
CEPH_SZ_METRIC_SHOW("write", total, avg_sz, min_sz, max_sz, sum_sz);
for (i = 0; i < METRIC_MAX; i++) {
/* skip 'metadata' as it doesn't use the size metric */
if (i == METRIC_METADATA)
continue;
m = &cm->metric[i];
spin_lock(&m->lock);
total = m->total;
sum = m->size_sum;
avg = total > 0 ? DIV64_U64_ROUND_CLOSEST(sum, total) : 0;
min = m->size_min;
max = m->size_max;
spin_unlock(&m->lock);
CEPH_SZ_METRIC_SHOW(metric_str[i], total, avg, min, max, sum);
}
return 0;
}

128
fs/ceph/metric.c
View file

@ -62,7 +62,7 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
read->header.ver = 1;
read->header.compat = 1;
read->header.data_len = cpu_to_le32(sizeof(*read) - header_len);
sum = m->read_latency_sum;
sum = m->metric[METRIC_READ].latency_sum;
jiffies_to_timespec64(sum, &ts);
read->sec = cpu_to_le32(ts.tv_sec);
read->nsec = cpu_to_le32(ts.tv_nsec);
@ -74,7 +74,7 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
write->header.ver = 1;
write->header.compat = 1;
write->header.data_len = cpu_to_le32(sizeof(*write) - header_len);
sum = m->write_latency_sum;
sum = m->metric[METRIC_WRITE].latency_sum;
jiffies_to_timespec64(sum, &ts);
write->sec = cpu_to_le32(ts.tv_sec);
write->nsec = cpu_to_le32(ts.tv_nsec);
@ -86,7 +86,7 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
meta->header.ver = 1;
meta->header.compat = 1;
meta->header.data_len = cpu_to_le32(sizeof(*meta) - header_len);
sum = m->metadata_latency_sum;
sum = m->metric[METRIC_METADATA].latency_sum;
jiffies_to_timespec64(sum, &ts);
meta->sec = cpu_to_le32(ts.tv_sec);
meta->nsec = cpu_to_le32(ts.tv_nsec);
@ -141,8 +141,8 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
rsize->header.ver = 1;
rsize->header.compat = 1;
rsize->header.data_len = cpu_to_le32(sizeof(*rsize) - header_len);
rsize->total_ops = cpu_to_le64(m->total_reads);
rsize->total_size = cpu_to_le64(m->read_size_sum);
rsize->total_ops = cpu_to_le64(m->metric[METRIC_READ].total);
rsize->total_size = cpu_to_le64(m->metric[METRIC_READ].size_sum);
items++;
/* encode the write io size metric */
@ -151,8 +151,8 @@ static bool ceph_mdsc_send_metrics(struct ceph_mds_client *mdsc,
wsize->header.ver = 1;
wsize->header.compat = 1;
wsize->header.data_len = cpu_to_le32(sizeof(*wsize) - header_len);
wsize->total_ops = cpu_to_le64(m->total_writes);
wsize->total_size = cpu_to_le64(m->write_size_sum);
wsize->total_ops = cpu_to_le64(m->metric[METRIC_WRITE].total);
wsize->total_size = cpu_to_le64(m->metric[METRIC_WRITE].size_sum);
items++;
put_unaligned_le32(items, &head->num);
@ -220,7 +220,8 @@ static void metric_delayed_work(struct work_struct *work)
int ceph_metric_init(struct ceph_client_metric *m)
{
int ret;
struct ceph_metric *metric;
int ret, i;
if (!m)
return -EINVAL;
@ -243,32 +244,18 @@ int ceph_metric_init(struct ceph_client_metric *m)
if (ret)
goto err_i_caps_mis;
spin_lock_init(&m->read_metric_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;
m->read_size_min = U64_MAX;
m->read_size_max = 0;
m->read_size_sum = 0;
spin_lock_init(&m->write_metric_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;
m->write_size_min = U64_MAX;
m->write_size_max = 0;
m->write_size_sum = 0;
spin_lock_init(&m->metadata_metric_lock);
m->metadata_latency_sq_sum = 0;
m->metadata_latency_min = KTIME_MAX;
m->metadata_latency_max = 0;
m->total_metadatas = 0;
m->metadata_latency_sum = 0;
for (i = 0; i < METRIC_MAX; i++) {
metric = &m->metric[i];
spin_lock_init(&metric->lock);
metric->size_sum = 0;
metric->size_min = U64_MAX;
metric->size_max = 0;
metric->total = 0;
metric->latency_sum = 0;
metric->latency_sq_sum = 0;
metric->latency_min = KTIME_MAX;
metric->latency_max = 0;
}
atomic64_set(&m->opened_files, 0);
ret = percpu_counter_init(&m->opened_inodes, 0, GFP_KERNEL);
@ -338,9 +325,9 @@ static inline void __update_stdev(ktime_t total, ktime_t lsum,
*sq_sump += sq;
}
void ceph_update_read_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc)
void ceph_update_metrics(struct ceph_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc)
{
ktime_t lat = ktime_sub(r_end, r_start);
ktime_t total;
@ -348,63 +335,12 @@ void ceph_update_read_metrics(struct ceph_client_metric *m,
if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
return;
spin_lock(&m->read_metric_lock);
total = ++m->total_reads;
m->read_size_sum += size;
m->read_latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->read_size_min,
m->read_size_max,
size);
METRIC_UPDATE_MIN_MAX(m->read_latency_min,
m->read_latency_max,
lat);
__update_stdev(total, m->read_latency_sum,
&m->read_latency_sq_sum, lat);
spin_unlock(&m->read_metric_lock);
}
void ceph_update_write_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc)
{
ktime_t lat = ktime_sub(r_end, r_start);
ktime_t total;
if (unlikely(rc && rc != -ETIMEDOUT))
return;
spin_lock(&m->write_metric_lock);
total = ++m->total_writes;
m->write_size_sum += size;
m->write_latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->write_size_min,
m->write_size_max,
size);
METRIC_UPDATE_MIN_MAX(m->write_latency_min,
m->write_latency_max,
lat);
__update_stdev(total, m->write_latency_sum,
&m->write_latency_sq_sum, lat);
spin_unlock(&m->write_metric_lock);
}
void ceph_update_metadata_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
int rc)
{
ktime_t lat = ktime_sub(r_end, r_start);
ktime_t total;
if (unlikely(rc && rc != -ENOENT))
return;
spin_lock(&m->metadata_metric_lock);
total = ++m->total_metadatas;
m->metadata_latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->metadata_latency_min,
m->metadata_latency_max,
lat);
__update_stdev(total, m->metadata_latency_sum,
&m->metadata_latency_sq_sum, lat);
spin_unlock(&m->metadata_metric_lock);
spin_lock(&m->lock);
total = ++m->total;
m->size_sum += size;
METRIC_UPDATE_MIN_MAX(m->size_min, m->size_max, size);
m->latency_sum += lat;
METRIC_UPDATE_MIN_MAX(m->latency_min, m->latency_max, lat);
__update_stdev(total, m->latency_sum, &m->latency_sq_sum, lat);
spin_unlock(&m->lock);
}

80
fs/ceph/metric.h
View file

@ -125,6 +125,25 @@ struct ceph_metric_head {
__le32 num; /* the number of metrics that will be sent */
} __packed;
enum metric_type {
METRIC_READ,
METRIC_WRITE,
METRIC_METADATA,
METRIC_MAX
};
struct ceph_metric {
spinlock_t lock;
u64 total;
u64 size_sum;
u64 size_min;
u64 size_max;
ktime_t latency_sum;
ktime_t latency_sq_sum;
ktime_t latency_min;
ktime_t latency_max;
};
/* This is the global metrics */
struct ceph_client_metric {
atomic64_t total_dentries;
@ -135,32 +154,7 @@ struct ceph_client_metric {
struct percpu_counter i_caps_hit;
struct percpu_counter i_caps_mis;
spinlock_t read_metric_lock;
u64 total_reads;
u64 read_size_sum;
u64 read_size_min;
u64 read_size_max;
ktime_t read_latency_sum;
ktime_t read_latency_sq_sum;
ktime_t read_latency_min;
ktime_t read_latency_max;
spinlock_t write_metric_lock;
u64 total_writes;
u64 write_size_sum;
u64 write_size_min;
u64 write_size_max;
ktime_t write_latency_sum;
ktime_t write_latency_sq_sum;
ktime_t write_latency_min;
ktime_t write_latency_max;
spinlock_t metadata_metric_lock;
u64 total_metadatas;
ktime_t metadata_latency_sum;
ktime_t metadata_latency_sq_sum;
ktime_t metadata_latency_min;
ktime_t metadata_latency_max;
struct ceph_metric metric[METRIC_MAX];
/* The total number of directories and files that are opened */
atomic64_t opened_files;
@ -195,13 +189,29 @@ static inline void ceph_update_cap_mis(struct ceph_client_metric *m)
percpu_counter_inc(&m->i_caps_mis);
}
extern void ceph_update_read_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc);
extern void ceph_update_write_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc);
extern void ceph_update_metadata_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
int rc);
extern void ceph_update_metrics(struct ceph_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc);
static inline void ceph_update_read_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc)
{
ceph_update_metrics(&m->metric[METRIC_READ],
r_start, r_end, size, rc);
}
static inline void ceph_update_write_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
unsigned int size, int rc)
{
ceph_update_metrics(&m->metric[METRIC_WRITE],
r_start, r_end, size, rc);
}
static inline void ceph_update_metadata_metrics(struct ceph_client_metric *m,
ktime_t r_start, ktime_t r_end,
int rc)
{
ceph_update_metrics(&m->metric[METRIC_METADATA],
r_start, r_end, 0, rc);
}
#endif /* _FS_CEPH_MDS_METRIC_H */