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

[Peter Zijlstra]

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
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