From: Martin KaFai Lau <kafai@fb.com>
To: Florian Lehner <dev@der-flo.net>
Cc: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <ast@kernel.org>,
<daniel@iogearbox.net>, <andrii@kernel.org>,
<john.fastabend@gmail.com>, <peterz@infradead.org>,
<mingo@redhat.com>, <acme@kernel.org>
Subject: Re: [FIX bpf,perf] bpf,perf: return EOPNOTSUPP for bpf handler on PERF_COUNT_SW_DUMMY
Date: Mon, 16 Nov 2020 13:02:09 -0800 [thread overview]
Message-ID: <20201116210209.skeolnndx3gk2xav@kafai-mbp.dhcp.thefacebook.com> (raw)
In-Reply-To: <20201116183752.2716-1-dev@der-flo.net>
On Mon, Nov 16, 2020 at 07:37:52PM +0100, Florian Lehner wrote:
> bpf handlers for perf events other than tracepoints, kprobes or uprobes
> are attached to the overflow_handler of the perf event.
>
> Perf events of type software/dummy are placeholder events. So when
> attaching a bpf handle to an overflow_handler of such an event, the bpf
> handler will not be triggered.
>
> This fix returns the error EOPNOTSUPP to indicate that attaching a bpf
> handler to a perf event of type software/dummy is not supported.
>
> Signed-off-by: Florian Lehner <dev@der-flo.net>
It is missing a Fixes tag.
next prev parent reply other threads:[~2020-11-16 21:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-16 18:37 [FIX bpf,perf] bpf,perf: return EOPNOTSUPP for bpf handler on PERF_COUNT_SW_DUMMY Florian Lehner
2020-11-16 21:02 ` Martin KaFai Lau [this message]
2020-11-17 7:53 ` Peter Zijlstra
2020-11-17 15:39 ` Florian Lehner
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