Re: [PATCH 9/9] perf tool: Add pmu event alias support

Peter Zijlstra
2012-05-03T11:24:43Z

On Thu, 2012-05-03 at 12:56 +0200, Jiri Olsa wrote:
> - in sysfs you would have directory with aliases (now called 'events')
> - each alias is sysfs dir, with file attrs:
> file name = term name, file value = term value
> eg.:
> events/
> CAS_COUNT_RD/
> # files:
> config - value 1
> config1 - value 2
> mask - value ...

I'd prefer the thing Yan proposed (if the sysfs folks let us),

$foo/events/QHL_REQUEST_REMOTE_READS

with contents: "event=0x20,umask=0x4"

> this way it's also possible to add extra terms to existing alias
> in command line if needed... might be handy
>
That should always be possible, if you modify the parser to take things
like:

event=0x20,umask=0x4,event=0x21

and have latter values override earlier values, so it collapses into:

umask=0x4,event=0x21

you can simply take whatever comes out of the event file and stick extra
bits at the end.