Re: perf, tools: Refactor and support interval and CSV metrics v3
From: Jiri Olsa
Date: Thu Sep 03 2015 - 09:18:34 EST
On Wed, Sep 02, 2015 at 04:35:45PM -0700, Andi Kleen wrote:
> [v3: Addressed all review feedback. Update manpage for CSV. Various changes
> (see individual patches). Remove some more redundant code
> in printout callers.]
> [v2: Addressed (near) all review feedback. No manpage updates so far.
> Add support for --per-core metrics. Various cleanups.]
> [v3: Everything compiles again. Some more cleanups.]
> Currently perf stat does not support printing computed metrics for interval (-I xxx)
> or CSV (-x,) mode. For example IPC or TSX metrics over time are quite useful to know.
> This patch implements them. The main obstacle was that the
> metrics printing was all open coded all over the metrics computation code.
> The second patch refactors the metrics printing to work through call backs that
> can be more easily changed. This also cleans up the metrics printing significantly.
> The indentation is now handled through printf, no more need to manually count spaces.
> Then based on that it implements metrics printing for CSV and interval mode.
> Example output:
> % perf stat -I1000 -a sleep 1
> # time counts unit events metric multiplex
> 1.001301370 12020.049593 task-clock (msec) (100.00%)
> 1.001301370 3,952 context-switches # 0.329 K/sec (100.00%)
> 1.001301370 69 cpu-migrations # 0.006 K/sec (100.00%)
> 1.001301370 76 page-faults # 0.006 K/sec
> 1.001301370 386,582,789 cycles # 0.032 GHz (100.00%)
> 1.001301370 716,441,544 stalled-cycles-frontend # 185.33% frontend cycles idle (100.00%)
> 1.001301370 <not supported> stalled-cycles-backend
> 1.001301370 101,751,678 instructions # 0.26 insn per cycle
> 1.001301370 # 7.04 stalled cycles per insn (100.00%)
> 1.001301370 20,914,692 branches # 1.740 M/sec (100.00%)
> 1.001301370 1,943,630 branch-misses # 9.29% of all branches
> CSV mode
> % perf stat -x, -I1000 -a sleep 1
> 1.000852081,1030742150,,stalled-cycles-frontend,12010984057,100.00,199.81,frontend cycles idle
> 1.000852081,<not supported>,,stalled-cycles-backend,0,100.00
> 1.000852081,116782495,,instructions,12011130729,100.00,0.23,insn per cycle
> 1.000852081,,,,12011130729,100.00,8.83,stalled cycles per insn
> 1.000852081,1976560,,branch-misses,12010501884,100.00,8.32,of all branches
> Available in
> git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc-2.6 perf/stat-metrics-5
can't see perf/stat-metrics-5 branch
[jolsa@krava perf]$ git remote update ak
[jolsa@krava perf]$ git branch -r | grep perf/stat-metrics-
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