On 1/12/15 10:22 AM, Carl Love wrote:
Ah, this is the ioctl patch you had mentioned you mentioned previously. I hadn't found the patch before. Yes, this looks like it would work. I will see if I can get a prototype working with this patch. Thanks.
If you need to shove samples into perf (versus mmap updates) I suspect the prctl system call will have way to much overhead. In that case perhaps processes could export a shared memory buffer that a perf session could attach -- another aux buffer similar to what itrace needs. But then that brings in the perf_clock issue; samples would need to have the same time basis as kernel generated samples.
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