On 05/31/2012 11:41 AM, Pantelis Antoniou wrote:
There are a number of problems that this patch solves.
Do you have a feedback from core perf developers?
1. The format used by default is the binary perf trace format which is
both non-portable between arches and non human editable. The format
spr-replay uses is text based and easily understandable, and completely
portable between arches& kernel version. It can been used to collect
load data from an android ICS setup and then have the load analyzed
in a normal linux x86 host.
I agree. But, there was a lot of work to make perf.data is really portable
(although it's not so at this moment yet). Most probably others will have a
strong
objections against one more new data format just because a few unsolved issues
with an old one.
Example use:
IIUC something is broken now. I did:
perf record -a -R -f -m 8192 -c 1 -e sched:sched_switch -e
sched:sched_process_exit \
-e sched:sched_process_fork -e sched:sched_wakeup -e sched:sched_migrate_task
/bin/ls -la /
and then 'perf sched spr-replay -l -n':
[kworker/1:1/20] S R:2746584
[sshd/3102] S R:7293700
[perf/3749] S R:0
[perf/3750] S R:22583006
[swapper/1/0] S R:19165041
No events recorded for 'ls'? Obviously wrong since 'perf report --stdio' shows:
# Samples: 134 of event 'sched:sched_switch'
# Event count (approx.): 134
#
# Overhead Command Shared Object Symbol
# ........ ........... ............. ......
#
42.54% ls [unknown] [.] 00000000
41.79% kworker/1:1 [unknown] [.] 00000000
8.21% swapper [unknown] [.] 00000000
6.72% sshd [unknown] [.] 00000000
0.75% perf [unknown] [.] 00000000
I suppose 'ls' is incorrectly reported as [perf/3750] here.
And, finally, please fix annoying warnings about set-but-unused variables since
this can't be compiled with -Werror (which is on by default) with never versions
of gcc.
Dmitry
--- /tmp/builtin-sched.c 2012-05-31 09:01:00.000000000 +0000
+++ perf/builtin-sched.c 2012-05-31 08:41:55.000000000 +0000
@@ -342,7 +342,7 @@
{
u64 loops, last_loops, new_loops;
u64 sample_period;
- u64 ns1, ns2, delta, delta_new, delta_diff;
+ u64 ns1, ns2, delta;
/* 1 ms */
sample_period = 1000000;
@@ -362,12 +362,6 @@
} while (delta < sample_period);
new_loops = ((last_loops * sample_period) + (delta / 2)) / delta;
- delta_new = bogoloops_measure_stable(new_loops);
-
- if (delta_new > sample_period)
- delta_diff = delta_new - sample_period;
- else
- delta_diff = sample_period - delta_new;
bogoloops = new_loops;
}
@@ -3404,7 +3398,7 @@
static struct task *generate_spr_program(struct task_desc *task, unsigned long
*map_id_fwd, unsigned long *next_opt_id)
{
- struct sched_atom *atom, *atom_last;
+ struct sched_atom *atom;
unsigned long eventnr;
unsigned int exited;
unsigned int blocked;
@@ -3491,8 +3485,6 @@
for (eventnr = 0; eventnr < task->nr_events && !exited; eventnr++) {
- atom_last = atom;
-
atom = task->atoms[eventnr];
exited = atom->type == SCHED_EVENT_EXIT;
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