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

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Date:	Fri, 07 Nov 2014 17:21:08 +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: [RFC] perf-cache command interface design

Hello,

Here, I've tried to describe my idea of perf-cache subcommand interface.
It is just a design review, not implemented yet :)
Please give me your comments/ideas!

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

Current "perf buildid-cache [options]" are directly mapped to
"perf cache --buildid [options]".

And adding --sdt for managing SDT caches as below.

  Add or update SDT events in <FILES>
    perf cache --sdt --add|--update <FILES>

  Remove all SDT events for <FILES>
    perf cache --sdt --remove <FILES>

  List all SDT events
    perf cache --sdt --list

And --probes for managing probe-caches as below.

  Add new probe-cache entries for kernel, <PATH> or <MOD>.
    perf cache --probe [--exec <PATH>|--module <MOD>] --add <SPEC>

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

  Or remove all entires for given FILES
    perf cache --probe --remove <FILES>

  List the probe caches(including SDT) for kernel, <PATH>, or/and <BUILDID>.
    perf cache --probe --list [@<PATH>][#<BUILDID>]

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

Note that --probes also can be used for managing SDT events, which has % prefix
e.g.
  Add all SDT events for <PATH>
    perf cache --probe --exec <PATH> --add '%*:*'

  Remove some SDT events for <PATH>
    perf cache --probe --del '%some:events@<PATH>'

  Or remove all SDT events for <BUILDID>
    perf cache --probe --del '%*:*#<BUILDID>'


File Format
===========
All the cache files are placed under ~/.debug/ by default.
The paths of buildid cache of binary/symbols are not changed.

The SDT/probe caches are placed under the ~/.debug/.probes/path/to/bin/bu/ildid
and that is linked to ~/.debug/.probes/.buildid/bu/ildid
# To avoid conflict with files under /probes/*, I picked up .probes/.

This SDT/probe caches contain probe-definitions as following format.
----
#buildid:BUILDID
#path:PATH
p:%PROVIDER/EVENT PATH:OFFSET [ARGS]
p:PROBE/EVENT _text+OFFSET [ARGS]
----

Normal probes and SDT cache entries can be mixed in a cache file, we'll
load all the entries and filter by % prefixes.


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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