Messages in this thread | | | Date | Mon, 17 Aug 2009 16:40:07 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 4/4] perf tools: Add perf trace |
| |
* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> This adds perf trace into the set of perf tools. It is written to > fetch the tracepoints samples from perf events and display them, > according to the events informations given by the debugfs files > through the util/trace* tools. > > It is a rough first shot and doesn't yet handle the cpu, > timestamps fields and some other things. > > Example: > > perf record -f -e workqueue:workqueue_execution:record -F 1 -a > perf trace > > kblockd/0-236 [000] 0.000000: workqueue_execution: thread=:236 func=cfq_kick_queue+0x0 > kondemand/0-360 [000] 0.000000: workqueue_execution: thread=:360 func=do_dbs_timer+0x0 > kondemand/0-360 [000] 0.000000: workqueue_execution: thread=:360 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0 > kondemand/1-361 [000] 0.000000: workqueue_execution: thread=:361 func=do_dbs_timer+0x0
Nice!
> Todo: > > - A lot of things!
heh :-)
To help this move forward i've put the patches into tip:perfcounters/tracing. We might still rebase that branch, should it become necessary, before merging it into perfcounters/core - but it should give a first glimpse to people who want to try this.
A first bugreport:
took me some time to figure out that i need to pass in -R to create a trace.info. I think we want to share the namespace anyway - there's no real difference between perf.data and trace.info - both contain trace records.
once i added -R i ran into this problem:
# perf record -R -f -e workqueue:workqueue_execution:record -F 1 -a ^C [ perf record: Captured and wrote 0.250 MB perf.data (~10928 samples) ]
aldebaran:/home/mingo/linux/linux/tools/perf> perf trace Fatal: bad op token ) version = 0.5
Some missing patch?
Ingo
| |