From: Peter Zijlstra <peterz@infradead.org>
To: Alexei Starovoitov <ast@plumgrid.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Ingo Molnar <mingo@kernel.org>, Wang Nan <wangnan0@huawei.com>,
He Kuang <hekuang@huawei.com>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output() helper
Date: Wed, 21 Oct 2015 14:06:36 +0200 [thread overview]
Message-ID: <20151021120636.GB3604@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1445396556-4854-3-git-send-email-ast@kernel.org>
On Tue, Oct 20, 2015 at 08:02:34PM -0700, Alexei Starovoitov wrote:
> This helper is used to send raw data from eBPF program into
> special PERF_TYPE_SOFTWARE/PERF_COUNT_SW_BPF_OUTPUT perf_event.
> User space needs to perf_event_open() it (either for one or all cpus) and
> store FD into perf_event_array (similar to bpf_perf_event_read() helper)
> before eBPF program can send data into it.
>
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 2881145cda86..d3c417615361 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -110,6 +110,7 @@ enum perf_sw_ids {
> PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
> PERF_COUNT_SW_EMULATION_FAULTS = 8,
> PERF_COUNT_SW_DUMMY = 9,
> + PERF_COUNT_SW_BPF_OUTPUT = 10,
>
> PERF_COUNT_SW_MAX, /* non-ABI */
> };
Do you really need the new type? Can't you use DUMMY for this?
next prev parent reply other threads:[~2015-10-21 12:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-21 3:02 [PATCH net-next 0/3] bpf_perf_event_output helper Alexei Starovoitov
2015-10-21 3:02 ` [PATCH net-next 1/3] perf: pad raw data samples automatically Alexei Starovoitov
2015-10-21 3:02 ` [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output() helper Alexei Starovoitov
2015-10-21 10:01 ` He Kuang
2015-10-21 11:05 ` Wangnan (F)
2015-10-21 20:04 ` Alexei Starovoitov
2015-10-21 12:06 ` Peter Zijlstra [this message]
2015-10-21 17:26 ` Alexei Starovoitov
2015-10-21 19:33 ` Peter Zijlstra
2015-10-22 13:59 ` Peter Zijlstra
2015-10-22 15:38 ` Alexei Starovoitov
2015-10-23 14:39 ` Peter Zijlstra
2015-10-23 15:02 ` Alexei Starovoitov
2015-10-23 16:42 ` Peter Zijlstra
2015-10-23 17:25 ` Alexei Starovoitov
2015-10-26 1:46 ` Wangnan (F)
2015-10-26 10:27 ` Alexei Starovoitov
2015-10-21 3:02 ` [PATCH net-next 3/3] samples: bpf: add bpf_perf_event_output example Alexei Starovoitov
2015-10-22 13:42 ` [PATCH net-next 0/3] bpf_perf_event_output helper David Miller
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