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Revision 1.1, Fri May 12 14:34:00 2023 UTC (12 months ago) by claudio
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, HEAD 

Add example user profile btrace script.
With and OK mpi@

/*	$OpenBSD: uprofile.bt,v 1.1 2023/05/12 14:34:00 claudio Exp $	*/

/*
 * uprofile.bt	Userland profiling (stack sampling) at 100Hz.
 *
 * To produce a FlameGraph process the output with stackcollapse-bpftrace.pl
 * and flamegraph.pl found in:
 *	https://github.com/brendangregg/FlameGraph
 *
 * The PID of the to be monitored process is the first optional argument to
 * btrace(8).
 * This only works for a single static binary where everything was compiled
 * with -fno-omit-frame-pointer.
 */
profile:hz:100 / pid == $1 / {
	@[ustack] = count();
}