Re: [PATCH 1/2] perf: Add persistent event facilities

[Peter Zijlstra]

On Wed, 2012-03-21 at 15:34 +0100, Borislav Petkov wrote:
> Add a barebones implementation for registering persistent events with
> perf. For that, we don't destroy the buffers when they're unmapped;
> also, we map them read-only so that multiple agents can access them.

Yet you don't fail mmap() for VM_WRITE && ->persistent.
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