Re: [RESEND PATCH 0/5] perf core: Support overwrite ring buffer

Peter Zijlstra
2016-03-08T13:45:20Z

On Mon, Mar 07, 2016 at 03:50:14AM +0000, Wang Nan wrote:
> This patch set has been posted multiple times (with and without
> corresponding 'perf tool' patches), and doesn't receive further
> comment. I think it should be okay to merge them into mainline.
> There are many perf's improvement depend on it. However, Peter
> is not responsive after I fixed some problems he pointed out.
>
> Introduces 'write_backward' into perf_event_attr, allows kernel
> writing the ring buffer from the end of it. This feature allows
> extracting data from overwritable ring buffer.
>
> Wang Nan (5):
> perf core: Introduce new ioctl options to pause and resume ring buffer
> perf core: Set event's default overflow_handler
> perf core: Prepare writing into ring buffer from end
> perf core: Add backward attribute to perf event
> perf core: Reduce perf event output overhead by new overflow handler

perf kernel features are currently on hold until I can manage to run a
fuzzer for more than a few minutes without my machine having a seizure.