Messages in this thread | | | Date | Fri, 20 Feb 2009 15:04:41 -0800 | From | Corey Ashford <> | Subject | Re: [announce] Performance Counters for Linux, v6 |
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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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