os/bluestore: dump meta ratio in bluefs perf dump.

Signed-off-by: Igor Fedotov <[email protected]>

Author: ifed01

src/os/bluestore/BlueFS.cc

@@ -256,6 +256,9 @@ void BlueFS::_init_logger()
   b.add_u64(l_bluefs_slow_used_bytes, "slow_used_bytes",
 	    "Used bytes (slow device)",
 	    "slou", PerfCountersBuilder::PRIO_USEFUL, unit_t(UNIT_BYTES));
+  b.add_u64(l_bluefs_meta_ratio, "meta_ratio_micros",
+	    "Actual metadata/userdata ratio * 1e3",
+	    "mera", PerfCountersBuilder::PRIO_INTERESTING);
   b.add_u64(l_bluefs_num_files, "num_files", "File count",
 	    "f", PerfCountersBuilder::PRIO_USEFUL);
   b.add_u64(l_bluefs_log_bytes, "log_bytes", "Size of the metadata log",
@@ -483,6 +486,22 @@ void BlueFS::_update_logger_stats()
     logger->set(l_bluefs_slow_total_bytes, _get_block_device_size(BDEV_SLOW));
     logger->set(l_bluefs_slow_used_bytes, _get_used(BDEV_SLOW));
   }
+  double r = 0.0;
+  int64_t in_data = 0;
+  int64_t in_meta = 0;
+  in_data = get_used_non_bluefs();
+  in_meta = _get_used(BDEV_SLOW) + _get_used(BDEV_DB) + _get_used(BDEV_WAL);
+  if (in_data > 0) {
+    dout(10) << __func__ << " got meta ratio parameters, "
+            << "data: " << in_data << ", meta: " << in_meta
+            << dendl;
+    r = double(in_meta) / double(in_data);
+  } else {
+    dout(5) << __func__ << " got weird meta ratio parameters, "
+            << "data: " << in_data << ", meta: " << in_meta
+            << dendl;
+  }
+  logger->set(l_bluefs_meta_ratio, r * 1000);
 }
 
 int BlueFS::add_block_device(unsigned id, const string& path, bool trim,
@@ -572,6 +591,17 @@ uint64_t BlueFS::get_used()
   return used;
 }
 
+int64_t BlueFS::get_used_non_bluefs()
+{
+  uint64_t ret = 0;
+  if (shared_alloc_id > 0 && shared_alloc && shared_alloc->a) {
+    ret = (int64_t)_get_block_device_size(shared_alloc_id) -
+          shared_alloc->a->get_free() -
+          shared_alloc->bluefs_used;
+  }
+  return ret;
+}
+
 uint64_t BlueFS::_get_used(unsigned id) const
 {
   uint64_t used = 0;

src/os/bluestore/BlueFS.h

@@ -32,6 +32,7 @@ enum {
   l_bluefs_wal_used_bytes,
   l_bluefs_slow_total_bytes,
   l_bluefs_slow_used_bytes,
+  l_bluefs_meta_ratio,
   l_bluefs_num_files,
   l_bluefs_log_bytes,
   l_bluefs_log_compactions,
@@ -810,6 +811,7 @@ class BlueFS {
   int revert_wal_to_plain();
 
   uint64_t get_used();
+  int64_t get_used_non_bluefs();
   uint64_t get_block_device_size(unsigned id);
   uint64_t get_free(unsigned id);
   uint64_t get_used(unsigned id);