Em Tue, Jul 07, 2015 at 06:43:46PM +0300, Andrew Vagin escreveu:

On Mon, Jul 06, 2015 at 10:10:32AM -0700, Andy Lutomirski wrote:

quoted

On Mon, Jul 6, 2015 at 1:47 AM, Andrey Vagin [off-list ref] wrote:
Would it make more sense to have a new syscall instead?  You could
even still use nlattr formatting for the syscall results.

Andy, thank you for the feedback. I got your points. I need time to
think about them. I suppose that a new syscall can be more suitable in
this case, and I need time to form a vision of it. If you have any ideas
or thoughts, I would be glad to know about them.

If a new syscall would indeed be better for this, then using
sys_perf_event_open and on one of the perf_event_attr flip a bit to ask
for those PERF_RECORD_{COMM,FORK,PERF_RECORD_MMAP2, etc} to be generated
in the perf buffer could make it reuse all the userspace tooling, with
really minimal change: flip the bit, don't synthesize it from /proc.

- Arnaldo