linux-kernel - Re: [PATCH v2 net-next] bpf: fix bpf_perf_event

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Message-ID: <20151022124142.GQ17308@twins.programming.kicks-ass.net>
Date:	Thu, 22 Oct 2015 14:41:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Ingo Molnar <mingo@...nel.org>, He Kuang <hekuang@...wei.com>,
	Kaixu Xia <xiakaixu@...wei.com>,
	Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next] bpf: fix bpf_perf_event_read() helper

On Thu, Oct 22, 2015 at 08:30:36PM +0800, Wangnan (F) wrote:
> I have a question on inherit, not related to this patch:
> Is it safe for perf to disable attr->inherit if the event is system wide?
> I haven't read relate code completely. In my current knowledge the behavior
> of a system wide perf event should be same whether inherit is set or not.
> Is that true?

Yes, .inherit is pointless for cpu wide events, if we allow creating cpu
events with .inherit set that's unfortunate.

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