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SubjectRe: [announce] Performance Counters for Linux, v6


Peter Zijlstra wrote:
> On Fri, 2009-02-20 at 14:38 -0800, Corey Ashford wrote:
>> There may be other non-event-related changes that will not be handled
>> quite as well in this way. In the original email I hinted at that we
>> may want an option for mmap'd sample buffers at some point, and so I'm
>> not clear how you'd provide an ABI to request mmap'd buffers (you would
>> probably need to be able to request the size and get back a pointer to
>> the mmap'd buffer). Would this be done through a special
>> sys_perf_counter_open call? Or through a subsequent ioctl call on the
>> group leader after an open (which requires the counters to be initially
>> disabled), etc.
>
> What's stopping a regular mmap() call using the fd obtained from
> sys_perf_counter_open() ?

Perhaps nothing. I don't know why it didn't occur to me that this could
be done. If PCL supports this, great!

Thanks for your reply!

--
Regards,

- Corey

Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
cjashfor@us.ibm.com



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