On 10/3/11 1:17 PM, Peter Zijlstra wrote:
On Mon, 2011-10-03 at 12:38 -0700, Arun Sharma wrote:
trace_sched_stat_sleep(tsk, delta);
That one should be accessible as a tracepoint and will add delay to
count on each occurrence.
Right - the tracepoint seems to work. Was looking for the user stack
trace as well. For eg:
# cat foo.c
#include <unistd.h>
#include <time.h>
#include <sys/select.h>
main()
{
struct timespec ts1;
struct timeval tv1;
int i;
for (i = 0; i < 1000; i++) {
ts1.tv_sec = 0;
ts1.tv_nsec = 1000000;
nanosleep(&ts1, NULL);
tv1.tv_sec = 0;
tv1.tv_usec = 4000;
select(0, NULL, NULL, NULL, &tv1);
}
}
I want something that gives me 4 times as many samples on select() as
nanosleep().
perf record -g -e sched:sched_stat_sleep -- ./foo
doesn't seem to do it. Additionally, if I have a burn_1us_cpu() loop in
there, I'd expect to see as many samples as nanosleep() in the wall
clock profile.
-Arun
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