[RFC][PATCH 0/8] introduce slabinfo extended mode

[Sergey Senozhatsky]

Hi,

Add 'extended' slabinfo mode that provides additional information:
 -- totals summary
 -- slabs sorted by size
 -- slabs sorted by loss (waste)

The patches also introduces several new slabinfo options to limit the
number of slabs reported, sort slabs by loss (waste); and some fixes.


Extended output example (slabinfo -X -N 2):

 Slabcache Totals
 ----------------
 Slabcaches :              91   Aliases  :         119->69   Active:     63
 Memory used:       199798784   # Loss   :        10689376   MRatio:     5%
 # Objects  :          324301   # PartObj:           18151   ORatio:     5%
    
 Per Cache         Average              Min              Max            Total
 ----------------------------------------------------------------------------
 #Objects             5147                1            89068           324301
 #Slabs                199                1             3886            12537
 #PartSlab              12                0              240              778
 %PartSlab             32%               0%             100%               6%
 PartObjs                5                0             4569            18151
 % PartObj             26%               0%             100%               5%
 Memory            3171409             8192        127336448        199798784
 Used              3001736              160        121429728        189109408
 Loss               169672                0          5906720         10689376
    
 Per Object        Average              Min              Max
 -----------------------------------------------------------
 Memory                585                8             8192
 User                  583                8             8192
 Loss                    2                0               64
    
 Slabs sorted by size
 --------------------
 Name                   Objects Objsize           Space Slabs/Part/Cpu  O/S O %Fr %Ef Flg
 ext4_inode_cache         69948    1736       127336448      3871/0/15   18 3   0  95 a
 dentry                   89068     288        26058752      3164/0/17   28 1   0  98 a
    
 Slabs sorted by loss
 --------------------
 Name                   Objects Objsize            Loss Slabs/Part/Cpu  O/S O %Fr %Ef Flg
 ext4_inode_cache         69948    1736         5906720      3871/0/15   18 3   0  95 a
 inode_cache              11628     864          537472        642/0/4   18 2   0  94 a



The last patch in the series addresses Linus' comment from
http://marc.info/?l=linux-mm&m=144148518703321&w=2

(well, it's been some time. sorry.)


gnuplot script takes the slabinfo records file, where every record is a `slabinfo -X'
output. So the basic workflow is, for example, as follows:

	while [ 1 ]; do slabinfo -X -N 2 >> stats; sleep 1; done
	^C
	slabinfo-gnuplot.sh stats

The last command will produce 3 png files (and 3 stats files)
-- graph of slabinfo totals
-- graph of slabs by size
-- graph of slabs by loss


It's also possible to select a range of records for plotting (a range of collected
slabinfo outputs) via `-r 10,100` (for example); and compare totals from several
measurements (to visially compare slabs behaviour (10,50 range)) using
pre-parsed totals files:
	slabinfo-gnuplot.sh -r 10,50 -t stats-totals1 .. stats-totals2



Examples of graphs will be attached in a follow up letter.


This also, technically, supports ktest. Upload new slabinfo to target,
collect the stats and give the resulting stats file to slabinfo-gnuplot


Sergey Senozhatsky (8):
  tools/vm/slabinfo: use getopt no_argument/optional_argument
  tools/vm/slabinfo: limit the number of reported slabs
  tools/vm/slabinfo: sort slabs by loss
  tools/vm/slabinfo: fix alternate opts names
  tools/vm/slabinfo: introduce extended totals mode
  tools/vm/slabinfo: output sizes in bytes
  tools/vm/slabinfo: cosmetic globals cleanup
  tools/vm/slabinfo: gnuplot slabifo extended stat

 tools/vm/slabinfo-gnuplot.sh | 275 +++++++++++++++++++++++++++++++++++++++++++
 tools/vm/slabinfo.c          | 255 +++++++++++++++++++++++++--------------
 2 files changed, 442 insertions(+), 88 deletions(-)
 create mode 100755 tools/vm/slabinfo-gnuplot.sh

-- 
2.6.1.134.g4b1fd35

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