linux-kernel - Re: [RFC PATCH 08/17] perf: Allow inheritance for detached events

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Message-ID: <20171003144222.fkwufhowb7lrqwi3@hirez.programming.kicks-ass.net>
Date:   Tue, 3 Oct 2017 16:42:22 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        acme@...hat.com, kirill.shutemov@...ux.intel.com,
        Borislav Petkov <bp@...en8.de>, rric@...nel.org
Subject: Re: [RFC PATCH 08/17] perf: Allow inheritance for detached events

On Tue, Sep 05, 2017 at 04:30:17PM +0300, Alexander Shishkin wrote:
> This enables inheritance for detached events. Unlike traditional events,
> these do not have parents: inheritance produces a new independent event
> with the same attribute. If the 'parent' event has a ring buffer, so will
> the new event. Considering the mlock accounting, this buffer allocation
> may fail, which in turn will fail the parent's fork, something to be
> aware of.
> 
> This also effectively disables context cloning, because unlike the
> traditional events, these will each have its own ring buffer and
> context switch optimization can't work.

Right, so this thing is icky... as you know. More naming issues though,
what will you go and call those files.