linux-kernel - Re: [PATCH] perf test: Add bpf-output event

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Date:	Thu, 19 Nov 2015 15:29:22 -0800
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, ast@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf test: Add bpf-output event

Wangnan (F) [wangnan0@...wei.com] wrote:
| 
| 
| On 2015/11/19 7:14, Alexei Starovoitov wrote:
| >On Wed, Nov 18, 2015 at 05:50:39PM -0300, Arnaldo Carvalho de Melo wrote:
| >>Em Wed, Nov 18, 2015 at 11:26:04AM -0800, Sukadev Bhattiprolu escreveu:
| >>>>From 8f71d55dd3e27e6ca2138e3ed6dfeceb1c00a426 Mon Sep 17 00:00:00 2001
| >>>From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
| >>>Date: Wed, 18 Nov 2015 19:06:08 -0500
| >>>Subject: [PATCH] perf test: Add bpf-output event
| >>>
| >>>The kernel has added support for 'PERF_COUNT_SW_BPF_OUTPUT' but that is
| >>>missing from the perf tool. Among other things, results in the 'roundtrip
| >>>evsel->name check' test case of 'perf test' failing on Powerpc.
| >>Next time can you please state if this is for this merge window or for
| >>the next?
| >>
| >>Will apply it for perf/core, for the next merge window.
| >wait a sec, I believe Wang has posted an RFC a month ago that adds support
| >for this properly instead of simply shutting up the error.
| 
| Yes. Please have a look at
| 
| http://lkml.kernel.org/g/1446029705-199659-3-git-send-email-wangnan0@huawei.com
| 
| and patch 23/31 - 31/31 in
| 
| http://lkml.kernel.org/g/1444826502-49291-1-git-send-email-wangnan0@huawei.com
| 
| We are working on a solution which truly utilizes bpf-output, including
| filling event array and extracting BPF output through perf data to CTF
| format. Now they are separated in multiple patchset, and I'd like to
| resend them to Arnaldo in this week.

Ok. It looked like there was development going on around BPF so I put
in the stubs to avoid false positives in the perf test.  There is a BPF
filter test case that is also getting Skipped. Would this patchset address
that too?

Sukadev

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