To enable userspace to calculate the current latency, not just the average latency since the filesystem was mounted. We have been running this patch for a while on our servers and our Prometheus exporter collects these statistics: https://github.com/CM4all/Prometheus-Exporters/ https://github.com/CM4all/Prometheus-Exporters/blob/master/src/KernelExporter.cxx Signed-off-by: Max Kellermann <max.kellermann@xxxxxxxxx> --- fs/ceph/debugfs.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index 2abee7e18144..d13a1ab8822a 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -170,6 +170,30 @@ static const char * const metric_str[] = { "metadata", "copyfrom" }; + +static int metrics_counters_show(struct seq_file *s, void *p) +{ + struct ceph_fs_client *fsc = s->private; + struct ceph_client_metric *cm = &fsc->mdsc->metric; + u64 count, size_bytes, wait_ns; + + seq_printf(s, "item count size_bytes wait_ns\n"); + + for (unsigned i = 0; i < METRIC_MAX; i++) { + struct ceph_metric *m = &cm->metric[i]; + spin_lock(&m->lock); + count = m->total; + size_bytes = m->size_sum; + wait_ns = ktime_to_ns(m->latency_sum); + spin_unlock(&m->lock); + + seq_printf(s, "%s %llu %llu %llu\n", + metric_str[i], count, size_bytes, wait_ns); + } + + return 0; +} + static int metrics_latency_show(struct seq_file *s, void *p) { struct ceph_fs_client *fsc = s->private; @@ -368,6 +392,7 @@ DEFINE_SHOW_ATTRIBUTE(caps); DEFINE_SHOW_ATTRIBUTE(mds_sessions); DEFINE_SHOW_ATTRIBUTE(status); DEFINE_SHOW_ATTRIBUTE(metrics_file); +DEFINE_SHOW_ATTRIBUTE(metrics_counters); DEFINE_SHOW_ATTRIBUTE(metrics_latency); DEFINE_SHOW_ATTRIBUTE(metrics_size); DEFINE_SHOW_ATTRIBUTE(metrics_caps); @@ -463,6 +488,8 @@ void ceph_fs_debugfs_init(struct ceph_fs_client *fsc) debugfs_create_file("file", 0444, fsc->debugfs_metrics_dir, fsc, &metrics_file_fops); + debugfs_create_file("counters", 0444, fsc->debugfs_metrics_dir, fsc, + &metrics_counters_fops); debugfs_create_file("latency", 0444, fsc->debugfs_metrics_dir, fsc, &metrics_latency_fops); debugfs_create_file("size", 0444, fsc->debugfs_metrics_dir, fsc, -- 2.39.2
