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...@hitachi.com
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