linux-kernel - Re: [RFC PATCH 3/6] bpf: Save the pointer to struct perf

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Message-ID: <20150717120206.GG19282@twins.programming.kicks-ass.net>
Date:	Fri, 17 Jul 2015 14:02:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	kaixu xia <xiakaixu@...wei.com>, ast@...mgrid.com,
	davem@...emloft.net, acme@...nel.org, mingo@...hat.com,
	masami.hiramatsu.pt@...achi.com, jolsa@...nel.org,
	linux-kernel@...r.kernel.org, pi3orama@....com, hekuang@...wei.com
Subject: Re: [RFC PATCH 3/6] bpf: Save the pointer to struct perf_event to map

On Fri, Jul 17, 2015 at 07:54:55PM +0800, Wangnan (F) wrote:
> Thanks. In next version we will introduce a new function which do oppsite
> thing to
> perf_event_release_kernel() in perf/event/core.c, then fetch the event
> before fdput.

perf_event_get() as proposed, with the addition of the refcount
increment inside the fdget/fdput() is fine.

Note that the _get() name already implies a refcount increment.
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