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

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Message-ID: <55A8EFF1.3050005@huawei.com>
Date:	Fri, 17 Jul 2015 20:07:13 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 2015/7/17 20:02, Peter Zijlstra wrote:
> 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.

OK, you'll see it in v2.

Thank you.

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