slabtop

#slabtop
 Active / Total Objects (% used)    : 22443975 / 26121368 (85.9%)
 Active / Total Slabs (% used)      : 651780 / 651780 (100.0%)
 Active / Total Caches (% used)     : 73 / 100 (73.0%)
 Active / Total Size (% used)       : 3216469.83K / 3605107.92K (89.2%)
 Minimum / Average / Maximum Object : 0.01K / 0.14K / 15.88K

  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME
22522578 19097534  84%    0.10K 577502       39   2310008K buffer_head
1127175 1126998  99%    0.57K  20157	   56    645024K radix_tree_node
536064 453232  84%    0.06K   8376	 64     33504K kmalloc-64
353199 256470  72%    0.19K   8416	 42     67328K dentry
184665 184174  99%    1.06K   6214	 30    198848K xfs_inode
162816 162468  99%    0.15K   3072	 53     24576K xfs_ili
154488 151530  98%    0.50K   4830	 32     77280K kmalloc-512
116586 116586 100%    0.04K   1143	102	 4572K ext4_extent_status
 94710  94360  99%    0.09K   2255	 42	 9020K kmalloc-96
 93600  58186  62%    0.12K   2925	 32     11700K kmalloc-128
 90216  90216 100%    0.11K   2506	 36     10024K sysfs_dir_cache
 74990  66436  88%    0.38K   1787	 42     28592K blkdev_requests
 53380  53380 100%    0.05K    628	 85	 2512K shared_policy_node
 50904  50904 100%    0.07K    909	 56	 3636K Acpi-ParseExt
 46080  46080 100%    0.01K     90	512	  360K kmalloc-8
 34720  13615  39%    0.25K   1093	 32	 8744K kmalloc-256
 34614  34100  98%    0.59K    641	 54     20512K inode_cache
 30282  30044  99%    0.19K    721	 42	 5768K kmalloc-192
 28160  28160 100%    0.02K    110	256	  440K kmalloc-16
 25792  25792 100%    0.06K    403	 64	 1612K anon_vma
 24531  24216  98%    0.08K    481	 51	 1924K selinux_inode_security
 23580  23550  99%    1.04K    786	 30     25152K ext4_inode_cache
 22533  22533 100%    0.21K    609	 37	 4872K vm_area_struct
 20929  20271  96%    0.65K    428	 49     13696K proc_inode_cache
 20224  20224 100%    0.03K    158	128	  632K kmalloc-32
 17321  17091  98%    0.69K    381	 46     12192K sock_inode_cache
 14816  14704  99%    1.00K    463	 32     14816K kmalloc-1024
 13770  13770 100%    0.04K    135	102	  540K Acpi-Namespace
 13247  13076  98%    0.23K    379	 35	 3032K cfq_queue
 12051  11897  98%    0.81K    309	 39	 9888K task_xstate
 10880  10880 100%    0.02K     64	170	  256K fsnotify_event_holder
  7552   7552 100%    0.03K     59	128	  236K jbd2_revoke_record_s
  7473   7473 100%    0.67K    159	 47	 5088K shmem_inode_cache
  6224   6224 100%    2.00K    389	 16     12448K kmalloc-2048
  6016   6016 100%    0.06K     94	 64	  376K ext4_free_data
  5936   5827  98%    1.12K    212	 28	 6784K signal_cache
  5440   5440 100%    0.05K     64	 85	  256K jbd2_journal_handle
  5016   4916  98%    1.94K    317	 16     10144K TCP