Re: [PATCH] perf record: Add snapshot mode support for perf's regular events

[Wangnan (F)]

On 2015/11/25 17:27, Peter Zijlstra wrote:
> On Tue, Nov 24, 2015 at 10:00:31PM +0800, Yunlong Song wrote:
> > In our patch, we create and maintain a user space ring buffer to store
> > perf's tracing info, instead of directly writing to perf.data file as
> > before. In snapshot mode, only a SIGUSR2 signal can trigger perf to dump
> > the tracing info currently stored in the user space ring buffer to
> > perf.data file.
> I would very much like to first fix the perf overwrite mode: see
> lkml.kernel.org/r/20151023151205.GW11639@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I think they can be done in parallel. We can first do something with
tracking events and perf's output file, and wait for kernel level
overwrite mode fixed, then decide whether to implement perf's own
ringbuffer.

Thank you.

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