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Date: Thu, 15 Oct 2015 20:14:25 +0900
From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [RFC][PATCH 0/8] introduce slabinfo extended mode
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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