forked from Minki/linux
70c948206f
Add a new "r_ended" field to struct ceph_mds_request and use that to maintain the average latency of MDS requests. URL: https://tracker.ceph.com/issues/43215 Signed-off-by: Xiubo Li <xiubli@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/types.h>
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#include <linux/percpu_counter.h>
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#include <linux/math64.h>
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#include "metric.h"
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int ceph_metric_init(struct ceph_client_metric *m)
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{
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int ret;
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if (!m)
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return -EINVAL;
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atomic64_set(&m->total_dentries, 0);
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ret = percpu_counter_init(&m->d_lease_hit, 0, GFP_KERNEL);
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if (ret)
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return ret;
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ret = percpu_counter_init(&m->d_lease_mis, 0, GFP_KERNEL);
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if (ret)
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goto err_d_lease_mis;
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ret = percpu_counter_init(&m->i_caps_hit, 0, GFP_KERNEL);
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if (ret)
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goto err_i_caps_hit;
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ret = percpu_counter_init(&m->i_caps_mis, 0, GFP_KERNEL);
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if (ret)
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goto err_i_caps_mis;
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spin_lock_init(&m->read_latency_lock);
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m->read_latency_sq_sum = 0;
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m->read_latency_min = KTIME_MAX;
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m->read_latency_max = 0;
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m->total_reads = 0;
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m->read_latency_sum = 0;
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spin_lock_init(&m->write_latency_lock);
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m->write_latency_sq_sum = 0;
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m->write_latency_min = KTIME_MAX;
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m->write_latency_max = 0;
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m->total_writes = 0;
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m->write_latency_sum = 0;
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spin_lock_init(&m->metadata_latency_lock);
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m->metadata_latency_sq_sum = 0;
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m->metadata_latency_min = KTIME_MAX;
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m->metadata_latency_max = 0;
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m->total_metadatas = 0;
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m->metadata_latency_sum = 0;
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return 0;
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err_i_caps_mis:
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percpu_counter_destroy(&m->i_caps_hit);
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err_i_caps_hit:
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percpu_counter_destroy(&m->d_lease_mis);
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err_d_lease_mis:
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percpu_counter_destroy(&m->d_lease_hit);
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return ret;
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}
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void ceph_metric_destroy(struct ceph_client_metric *m)
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{
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if (!m)
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return;
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percpu_counter_destroy(&m->i_caps_mis);
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percpu_counter_destroy(&m->i_caps_hit);
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percpu_counter_destroy(&m->d_lease_mis);
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percpu_counter_destroy(&m->d_lease_hit);
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}
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static inline void __update_latency(ktime_t *totalp, ktime_t *lsump,
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ktime_t *min, ktime_t *max,
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ktime_t *sq_sump, ktime_t lat)
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{
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ktime_t total, avg, sq, lsum;
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total = ++(*totalp);
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lsum = (*lsump += lat);
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if (unlikely(lat < *min))
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*min = lat;
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if (unlikely(lat > *max))
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*max = lat;
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if (unlikely(total == 1))
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return;
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/* the sq is (lat - old_avg) * (lat - new_avg) */
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avg = DIV64_U64_ROUND_CLOSEST((lsum - lat), (total - 1));
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sq = lat - avg;
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avg = DIV64_U64_ROUND_CLOSEST(lsum, total);
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sq = sq * (lat - avg);
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*sq_sump += sq;
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}
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void ceph_update_read_latency(struct ceph_client_metric *m,
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ktime_t r_start, ktime_t r_end,
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int rc)
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{
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ktime_t lat = ktime_sub(r_end, r_start);
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if (unlikely(rc < 0 && rc != -ENOENT && rc != -ETIMEDOUT))
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return;
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spin_lock(&m->read_latency_lock);
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__update_latency(&m->total_reads, &m->read_latency_sum,
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&m->read_latency_min, &m->read_latency_max,
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&m->read_latency_sq_sum, lat);
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spin_unlock(&m->read_latency_lock);
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}
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void ceph_update_write_latency(struct ceph_client_metric *m,
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ktime_t r_start, ktime_t r_end,
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int rc)
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{
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ktime_t lat = ktime_sub(r_end, r_start);
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if (unlikely(rc && rc != -ETIMEDOUT))
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return;
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spin_lock(&m->write_latency_lock);
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__update_latency(&m->total_writes, &m->write_latency_sum,
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&m->write_latency_min, &m->write_latency_max,
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&m->write_latency_sq_sum, lat);
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spin_unlock(&m->write_latency_lock);
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}
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void ceph_update_metadata_latency(struct ceph_client_metric *m,
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ktime_t r_start, ktime_t r_end,
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int rc)
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{
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ktime_t lat = ktime_sub(r_end, r_start);
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if (unlikely(rc && rc != -ENOENT))
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return;
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spin_lock(&m->metadata_latency_lock);
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__update_latency(&m->total_metadatas, &m->metadata_latency_sum,
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&m->metadata_latency_min, &m->metadata_latency_max,
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&m->metadata_latency_sq_sum, lat);
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spin_unlock(&m->metadata_latency_lock);
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}
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