linux-kernel - Re: [RFC PATCH 2/8] perf: Helpers for alloc/init/fini PMU specific data

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Message-ID: <20191204123656.GU2844@hirez.programming.kicks-ass.net>
Date:   Wed, 4 Dec 2019 13:36:56 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     mingo@...hat.com, acme@...nel.org, tglx@...utronix.de,
        bp@...en8.de, linux-kernel@...r.kernel.org, eranian@...gle.com,
        alexey.budankov@...ux.intel.com, vitaly.slobodskoy@...el.com,
        ak@...ux.intel.com
Subject: Re: [RFC PATCH 2/8] perf: Helpers for alloc/init/fini PMU specific
 data

On Mon, Dec 02, 2019 at 03:35:00PM -0500, Liang, Kan wrote:

> Could you please give me an example?

There's a ton of refcounting in perf, none of it follows this pattern.

> I think we do need something to protect the refcount. Are you suggesting
> atomic_*?

refcount_t comes to mind.