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osd: instrument osdmap bl cache hits and misses

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Add perfcounters so we can see whether we are missing osdmaps in the
cache.  This will let us tell whether, given a workload or environment,
our osdmap cache might be too small.

Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2017-05-25 15:41:04 -04:00
parent 0ff3d4291c
commit 73985a5b10
2 changed files with 21 additions and 2 deletions
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21
src/osd/OSD.cc
View File

@ -1395,8 +1395,13 @@ void OSDService::send_incremental_map(epoch_t since, Connection *con,
bool OSDService::_get_map_bl(epoch_t e, bufferlist& bl)
{
bool found = map_bl_cache.lookup(e, &bl);
if (found)
if (found) {
if (logger)
logger->inc(l_osd_map_bl_cache_hit);
return true;
}
if (logger)
logger->inc(l_osd_map_bl_cache_miss);
found = store->read(coll_t::meta(),
OSD::get_osdmap_pobject_name(e), 0, 0, bl) >= 0;
if (found)
@ -1408,8 +1413,13 @@ bool OSDService::get_inc_map_bl(epoch_t e, bufferlist& bl)
{
Mutex::Locker l(map_cache_lock);
bool found = map_bl_inc_cache.lookup(e, &bl);
if (found)
if (found) {
if (logger)
logger->inc(l_osd_map_bl_cache_hit);
return true;
}
if (logger)
logger->inc(l_osd_map_bl_cache_miss);
found = store->read(coll_t::meta(),
OSD::get_inc_osdmap_pobject_name(e), 0, 0, bl) >= 0;
if (found)
@ -2915,6 +2925,7 @@ void OSD::create_logger()
osd_plb.add_u64_counter(
l_osd_waiting_for_map, "messages_delayed_for_map",
"Operations waiting for OSD map");
osd_plb.add_u64_counter(
l_osd_map_cache_hit, "osd_map_cache_hit", "osdmap cache hit");
osd_plb.add_u64_counter(
@ -2925,6 +2936,12 @@ void OSD::create_logger()
osd_plb.add_u64_avg(
l_osd_map_cache_miss_low_avg, "osd_map_cache_miss_low_avg",
"osdmap cache miss, avg distance below cache lower bound");
osd_plb.add_u64_counter(
l_osd_map_bl_cache_hit, "osd_map_bl_cache_hit",
"OSDMap buffer cache hits");
osd_plb.add_u64_counter(
l_osd_map_bl_cache_miss, "osd_map_bl_cache_miss",
"OSDMap buffer cache misses");
osd_plb.add_u64(l_osd_stat_bytes, "stat_bytes", "OSD size");
osd_plb.add_u64(l_osd_stat_bytes_used, "stat_bytes_used", "Used space");

2
src/osd/OSD.h
View File

@ -131,6 +131,8 @@ enum {
l_osd_map_cache_miss,
l_osd_map_cache_miss_low,
l_osd_map_cache_miss_low_avg,
l_osd_map_bl_cache_hit,
l_osd_map_bl_cache_miss,
l_osd_stat_bytes,
l_osd_stat_bytes_used,