check_memory_usage() recreation in OSD:tick()

[Suyash Dongre <suyashd999@xxxxxxxxx>]

Hi guys!This is a function for MDS (src/mds/MDCache.cc) that prints out the
rss and other memory stats every couple seconds at debug level 2.I am
trying to create a similar function for printing memory and other stats for
OSD. (will be adding the code in src/osd/OSD:tick() function),can anyone
provide a basic guidelines about what all classes, functions I will need to
use and what all will I require for achieving so?Any help would be
extremely valuable, Thanks for your time!

void MDCache::check_memory_usage()
{
  static MemoryModel mm(g_ceph_context);
  static MemoryModel::snap last;
  mm.sample(&last);
  static MemoryModel::snap baseline = last;

  // check client caps
  ceph_assert(CInode::count() == inode_map.size() +
snap_inode_map.size() + num_shadow_inodes);
  double caps_per_inode = 0.0;
  if (CInode::count())
    caps_per_inode = (double)Capability::count() / (double)CInode::count();

  dout(2) << "Memory usage: "
	   << " total " << last.get_total()
	   << ", rss " << last.get_rss()
	   << ", heap " << last.get_heap()
	   << ", baseline " << baseline.get_heap()
	   << ", " << num_inodes_with_caps << " / " << CInode::count() << "
inodes have caps"
	   << ", " << Capability::count() << " caps, " << caps_per_inode << "
caps per inode"
	   << dendl;

  mds->update_mlogger();
  mds->mlogger->set(l_mdm_rss, last.get_rss());
  mds->mlogger->set(l_mdm_heap, last.get_heap());
}
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