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bpftrace examples fixes #2565

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bpftrace examples fixes #2565

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8726ecf
pmdabpftrace: fix TASK_RUNNING use in runq latency example
natoscott Apr 13, 2026
0148a3e
pmdabpftrace: fix kprobes used in the biolatency example
natoscott Apr 13, 2026
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20 changes: 12 additions & 8 deletions src/pmdas/bpftrace/examples/biolatency.bt
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Original file line number Diff line number Diff line change
Expand Up @@ -12,16 +12,20 @@
*/
// include: @usecs

kprobe:blk_account_io_start,
kprobe:__blk_account_io_start
tracepoint:block:block_bio_queue
{
@start[arg0] = nsecs;
@start[args.sector] = nsecs;
}

kprobe:blk_account_io_done,
kprobe:__blk_account_io_done
/@start[arg0]/
tracepoint:block:block_rq_complete,
tracepoint:block:block_bio_complete
/@start[args.sector]/
{
@usecs = hist((nsecs - @start[arg0]) / 1000);
delete(@start[arg0]);
@usecs = hist((nsecs - @start[args.sector]) / 1000);
delete(@start, args.sector);
}

END
{
clear(@start);
}
9 changes: 6 additions & 3 deletions src/pmdas/bpftrace/examples/runqlat.bt
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Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,6 @@
*/
// include: @usecs

#include <linux/sched.h>

tracepoint:sched:sched_wakeup,
tracepoint:sched:sched_wakeup_new
{
Expand All @@ -22,7 +20,7 @@ tracepoint:sched:sched_wakeup_new

tracepoint:sched:sched_switch
{
if (args->prev_state == TASK_RUNNING) {
if (args->prev_state == 0) { /* TASK_RUNNING */
@qtime[args->prev_pid] = nsecs;
}

Expand All @@ -32,3 +30,8 @@ tracepoint:sched:sched_switch
}
delete(@qtime[args->next_pid]);
}

END
{
clear(@qtime);
}
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