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Feature/multi sections #1

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Feature/multi sections #1

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acfc691
track multiple sections in erl_section.d
andrewjstone Apr 30, 2015
bc0df8b
just keep track of section data in aggregates
andrewjstone Apr 30, 2015
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52 changes: 32 additions & 20 deletions erl_section/erl_section.d
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Original file line number Diff line number Diff line change
@@ -1,6 +1,13 @@
#pragma D option quiet
self uint64_t start;
int p[string];

struct timeinfo {
uint64_t start;
uint64_t duration;
int section;
};

struct timeinfo p[string];
/* Change this to the maximum expected elapsed time for the section.
* Defaults to 200 micro-seconds
*/
Expand All @@ -12,52 +19,57 @@ inline int BUCKET_SIZE = 5000;

/* Process entered measured section. */
erlang$target:::user_trace-i4s4
/arg2 == 1/
/arg2 % 2 == 1 && p[copyinstr(arg0)].section == 0/ /* No nested tracing */
{
this->proc = copyinstr(arg0);
self->start = vtimestamp;
p[this->proc].start = vtimestamp;
p[this->proc].duration = 0;
p[this->proc].section = arg2;
}

/* If process running our section is unscheduled, remember where we were */
erlang$target:::process-unscheduled
/self->start/
/p[copyinstr(arg0)].section != 0/
{
this->proc = copyinstr(arg0);
p[this->proc] += vtimestamp - self->start;
self->start = 0;
@unscheduled = count();
p[this->proc].duration += vtimestamp - p[this->proc].start;
p[this->proc].start = 0;
@unscheduled[this->proc] = count();
}

/* If process that was interrupted in our section runs again */
erlang$target:::process-scheduled
/ p[copyinstr(arg0)] /
/ p[copyinstr(arg0)].section != 0/
{
this->proc = copyinstr(arg0);
self->start = vtimestamp;
p[this->proc].start = vtimestamp;
}

/* Process exits measured section */
erlang$target:::user_trace-i4s4
/arg2 == 2/
/arg2 % 2 == 0 && p[copyinstr(arg0)].section != 0/
{
this->proc = copyinstr(arg0);
this->elapsed = p[this->proc] + vtimestamp - self->start;
p[this->proc] = 0;
@lmin = min(this->elapsed);
@lmax = max(this->elapsed);
@lavg = avg(this->elapsed);
@lq = lquantize(this->elapsed, 0, EXPECTED_MAX, BUCKET_SIZE);
@cnt = count();
self->start = 0;
this->section = arg2;
this->elapsed = p[this->proc].duration + vtimestamp - p[this->proc].start;
@cnt[this->section] = count();
@lmin[this->section] = min(this->elapsed);
@lmax[this->section] = max(this->elapsed);
@lavg[this->section] = avg(this->elapsed);
@lq[this->section] = lquantize(this->elapsed, 0, EXPECTED_MAX, BUCKET_SIZE);
p[this->proc].duration = 0;
p[this->proc].start = 0;
p[this->proc].section = 0;
}

BEGIN {
printf("%10s%10s%10s%10s%10s\n", "Count", "Desched", "Min", "Avg", "Max");
printf("%s%10s%10s%10s%10s\n", "PID", "Count", "Min", "Avg", "Max");
}

profile:::tick-1s
{
printa("%@10u%@10u%@10u%@10u%@10u\n", @cnt, @unscheduled, @lmin, @lavg, @lmax);
printa(@cnt, @lmin, @lavg, @lmax);
printa(@unscheduled);
printa(@lq);
trunc(@lmin); trunc(@lmax); trunc(@lavg);trunc(@lq);
trunc(@cnt); trunc(@unscheduled);
Expand Down