linux-kernel - [PATCH 0/4] delayacct: save max CPU/IO/SWAP/RECLAIM delays

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Message-ID: <65795E11DBF1E645A09CEC7EAEE94B9CB574E70D@USINDEVS02.corp.hds.com>
Date:	Mon, 28 Nov 2011 17:44:08 -0500
From:	Satoru Moriya <satoru.moriya@....com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"bsingharora@...il.com" <bsingharora@...il.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"nagar@...son.ibm.com" <nagar@...son.ibm.com>,
	"kobayashi.kk@...s.nec.co.jp" <kobayashi.kk@...s.nec.co.jp>,
	Randy Dunlap <rdunlap@...otime.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@....com>
Subject: [PATCH 0/4] delayacct: save max CPU/IO/SWAP/RECLAIM delays

In the latency sensitive systems, we usually focus on the worst latency.
And so, it is useful to save max delays into the per-task delay
accounting functionality.

Example output:
(on 100 concurrent dd reading sparse files w/ 1 dd writing a file)

CPU             count     real total  virtual total    delay total      delay_max  delay average
                  222       45993008       74603882        7637295        3691858          0.034ms
IO              count    delay total      delay max  delay average
                    2       21812073       12728672             10ms
SWAP            count    delay total      delay max  delay average
                    0              0              0              0ms
RECLAIM         count    delay total      delay_max  delay average
                    2         348488         211985              0ms

Any comments are welcome.


Satoru Moriya (4):
  sched: add members to struct sched_info to save maximum
  delayacct: add members to struct task_delay_info to save max delays
  delayacct: update taskstats to save max delays
  getdelays: show max CPU/IO/SWAP/RECLAIM delays

 Documentation/accounting/getdelays.c          |   28 ++++++++++++++----------
 Documentation/accounting/taskstats-struct.txt |    9 ++++++++
 include/linux/sched.h                         |    5 ++++
 include/linux/taskstats.h                     |    8 ++++++-
 kernel/delayacct.c                            |   25 +++++++++++++++++----
 kernel/sched_stats.h                          |    5 ++++
 6 files changed, 62 insertions(+), 18 deletions(-)

-- 
1.7.6.4


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