https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198149
Bug ID: 198149
Summary: [hwpmc] pmcstat -P -t (top mode, process sampling)
stops after a while
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: adr...@freebsd.org
Hi,
Using pmcstat in top mode with system level sampling works fine, but process
level sampling stops reporting events after a while. A while is typically a
couple of seconds if you're lucky.
This is reproducable on -10 and -HEAD.
To reproduce:
* run something that's very busy - say, nginx with multiple worker processes
* run pmcstat -P CPU_CLK_UNHALTED_CORE -T -w 1 -t <nginx pid>
* wait until it stops providing events.
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