Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?

[Vince Weaver]

On Tue, 9 Jun 2015, David Ahern wrote:

> On 6/9/15 12:30 PM, Vince Weaver wrote:
> > Hello
> > 
> > I've been working on documenting the PERF_EVENT_IOC_SET_FILTER ioctl.
> > 
> > I've been trying for the past 2 days and have been unable to get any
> > result except EINVAL.
> > 
> > Does anyone ever use this ioctl?  Does anyone know how to use this ioctl?
> 
> yes and yes it works.
> 
> perf record -e irq:irq_handler_entry --filter irq==28 \
>             -e irq:softirq_entry --filter vec==6 -a \
>      -- sleep 5

# perf record -e irq:irq_handler_entry --filter irq==28 -e irq:softirq_entry --filter vec==6 -a -- sleep 5 
invalid or unsupported event: 'irq:irq_handler_entry'
Run 'perf list' for a list of valid events

perf list doesn't show any tracepoint events, despite having debugfs 
mounted and running as root and /sys/kernel/debug/tracing/events/ being
populated.

Vince


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