On Mon, 2021-03-22 at 20:28 +0800, xiubli@xxxxxxxxxx wrote: > From: Xiubo Li <xiubli@xxxxxxxxxx> > > Let the __update_latency() helper choose the correcsponding members > according to the metric_type. > > URL: https://tracker.ceph.com/issues/49913 > Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> > --- > fs/ceph/metric.c | 58 +++++++++++++++++++++++++++++++++++------------- > 1 file changed, 42 insertions(+), 16 deletions(-) > > diff --git a/fs/ceph/metric.c b/fs/ceph/metric.c > index 75d309f2fb0c..d5560ff99a9d 100644 > --- a/fs/ceph/metric.c > +++ b/fs/ceph/metric.c > @@ -249,19 +249,51 @@ void ceph_metric_destroy(struct ceph_client_metric *m) > ceph_put_mds_session(m->session); > } > > > > > > > > > -static inline void __update_latency(ktime_t *totalp, ktime_t *lsump, > - ktime_t *min, ktime_t *max, > - ktime_t *sq_sump, ktime_t lat) > +typedef enum { > + CEPH_METRIC_READ, > + CEPH_METRIC_WRITE, > + CEPH_METRIC_METADATA, > +} metric_type; > + > +static inline void __update_latency(struct ceph_client_metric *m, > + metric_type type, ktime_t lat) > { > + ktime_t *totalp, *minp, *maxp, *lsump, *sq_sump; > ktime_t total, avg, sq, lsum; > > > > > > > > > + switch (type) { > + case CEPH_METRIC_READ: > + totalp = &m->total_reads; > + lsump = &m->read_latency_sum; > + minp = &m->read_latency_min; > + maxp = &m->read_latency_max; > + sq_sump = &m->read_latency_sq_sum; > + break; > + case CEPH_METRIC_WRITE: > + totalp = &m->total_writes; > + lsump = &m->write_latency_sum; > + minp = &m->write_latency_min; > + maxp = &m->write_latency_max; > + sq_sump = &m->write_latency_sq_sum; > + break; > + case CEPH_METRIC_METADATA: > + totalp = &m->total_metadatas; > + lsump = &m->metadata_latency_sum; > + minp = &m->metadata_latency_min; > + maxp = &m->metadata_latency_max; > + sq_sump = &m->metadata_latency_sq_sum; > + break; > + default: > + return; > + } > + > total = ++(*totalp); Why are you adding one to *totalp above? Is that to avoid it being 0? > lsum = (*lsump += lat); > > ^^^ Instead of doing all of the above with pointers, why not just add to total and lsum directly inside the switch statement? This seems like a lot of pointless indirection. > > > > > > - if (unlikely(lat < *min)) > - *min = lat; > - if (unlikely(lat > *max)) > - *max = lat; > + if (unlikely(lat < *minp)) > + *minp = lat; > + if (unlikely(lat > *maxp)) > + *maxp = lat; > > > > > if (unlikely(total == 1)) > return; > @@ -284,9 +316,7 @@ void ceph_update_read_metrics(struct ceph_client_metric *m, > return; > > > > > spin_lock(&m->read_metric_lock); > - __update_latency(&m->total_reads, &m->read_latency_sum, > - &m->read_latency_min, &m->read_latency_max, > - &m->read_latency_sq_sum, lat); > + __update_latency(m, CEPH_METRIC_READ, lat); > spin_unlock(&m->read_metric_lock); > } > > > > > @@ -300,9 +330,7 @@ void ceph_update_write_metrics(struct ceph_client_metric *m, > return; > > > > > spin_lock(&m->write_metric_lock); > - __update_latency(&m->total_writes, &m->write_latency_sum, > - &m->write_latency_min, &m->write_latency_max, > - &m->write_latency_sq_sum, lat); > + __update_latency(m, CEPH_METRIC_WRITE, lat); > spin_unlock(&m->write_metric_lock); > } > > > > > @@ -316,8 +344,6 @@ void ceph_update_metadata_metrics(struct ceph_client_metric *m, > return; > > > > > spin_lock(&m->metadata_metric_lock); > - __update_latency(&m->total_metadatas, &m->metadata_latency_sum, > - &m->metadata_latency_min, &m->metadata_latency_max, > - &m->metadata_latency_sq_sum, lat); > + __update_latency(m, CEPH_METRIC_METADATA, lat); > spin_unlock(&m->metadata_metric_lock); > } -- Jeff Layton <jlayton@xxxxxxxxxx>
