linux-kernel - Re: [PATCH v2 1/5] bpf: Add new bpf map type to store the pointer to struct perf

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Date:	Wed, 22 Jul 2015 18:39:12 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>,
	Kaixu Xia <xiakaixu@...wei.com>, davem@...emloft.net,
	acme@...nel.org, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	masami.hiramatsu.pt@...achi.com, jolsa@...nel.org
Cc:	linux-kernel@...r.kernel.org, pi3orama@....com, hekuang@...wei.com
Subject: Re: [PATCH v2 1/5] bpf: Add new bpf map type to store the pointer to
 struct perf_event

On 7/22/15 6:08 PM, Wangnan (F) wrote:
> Then we should find another way to prevent user create a large map but
> only use
> a small portion of it, since normal array map can't report whether a
> slot is used
> or not. When releasing the map, we have to release each perf event.
> Currently the only
> way is to check map value in each slot.

yeah. In prog_array each element is either NULL ptr or valid
'struct bpf_prog *'. Why not to do the same for perf_event_array?

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