linux-kernel - Re: [RFC] perf-cache command interface design

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Date:	Mon, 10 Nov 2014 19:59:24 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com,
	hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com,
	systemtap@...rceware.org, aravinda@...ux.vnet.ibm.com,
	penberg@....fi, brendan.d.gregg@...il.com,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [RFC] perf-cache command interface design

Hello,

Here is the second try for the probe-cache. This version simplifies
the synopsis, and unifies the SDT and probe caches.
Please give me your comments/ideas!

Command-line Synopsis
=====================

Add elf(or symbols) and probe-caches of SDT if exists in <FILES>
 perf cache --add <FILES> [--probe <SPEC>] # for user programs

 perf cache --kcore <FILE> [--probe <SPEC>] # for kcore ?

 perf cache --probe <SPEC>  # for the current kernel

Remove caches related to <FILES> or <BUILDIDS>
 perf cache --remove <FILES>|<BUILDIDS>

Show all probe caches(including SDT) or buildids
 perf cache --list [probe|buildid]

Delete existing probe-cache entries for kernel, <PATH> or/and <BUILDID>.
 perf cache　--probe-del [<GROUP>:]<EVENT>[@<PATH>][#<BUILDID>]

Query the probe definitions.
 perf cache --query [<GROUP>:]<EVENT>[@<PATH>][#<BUILDID>]

File Format
===========
All the cache files are placed under ~/.debug/ by default.
Elf caches are ~/.debug/path/to/file/bu/ildid/elf
Symbols caches are ~/.debug/path/to/file/bu/ildid/syms
Probes(and SDT) are ~/.debug/path/to/file/bu/ildid/probes
And ~/.debug/path/to/file/bu/ildid/ is linked to ~/.debug/.buildid/bu/ildid
Optionally, we can gzip the probes file.

This probe caches contain probe-definitions as following format.
----
#buildid:BUILDID
#spec:SDT
p:sdt_<PROVIDER>/<EVENT> PATH:OFFSET [ARGS]
...
#spec:* $params
p:probe_<GROUP>/<EVENT> _text+OFFSET [ARGS]
...
----
So the #spec: line gives the information what probe spec has been given.
This will be used for updating.

And all the "probe_" and "sdt_" prefix will be replaced by % in the command line,
e.g.

 perf record -e %<PROVIDER>/<EVENT> -> this records sdt_PROVIDER/EVENT

Thank you,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com

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