linux-kernel - Re: [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf c2c

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Message-ID: <20220518041630.GD402837@leoy-ThinkPad-X240s>
Date:   Wed, 18 May 2022 12:16:30 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ali Saidi <alisaidi@...zon.com>, Joe Mario <jmario@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, german.gomez@....com,
        benh@...nel.crashing.org, Nick.Forrington@....com,
        alexander.shishkin@...ux.intel.com, andrew.kilroy@....com,
        james.clark@....com, john.garry@...wei.com,
        Jiri Olsa <jolsa@...nel.org>, kjain@...ux.ibm.com,
        lihuafei1@...wei.com, mark.rutland@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, will@...nel.org
Subject: Re: [PATCH v8 0/4] perf: arm-spe: Decode SPE source and use for perf
 c2c

Hi Joe,

On Tue, May 17, 2022 at 06:20:03PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, May 17, 2022 at 02:03:21AM +0000, Ali Saidi escreveu:
> > When synthesizing data from SPE, augment the type with source information
> > for Arm Neoverse cores so we can detect situtions like cache line
> > contention and transfers on Arm platforms. 
> > 
> > This changes enables future changes to c2c on a system with SPE where lines that
> > are shared among multiple cores show up in perf c2c output. 
> > 
> > Changes is v9:
> >  * Change reporting of remote socket data which should make Leo's upcomping
> >    patch set for c2c make sense on multi-socket platforms  
> 
> Hey,
> 
> 	Joe Mario, who is one of 'perf c2c' authors asked me about some
> git tree he could clone from for both building the kernel and
> tools/perf/ so that he could do tests, can you please provide that?

I have uploaded the latest patches for enabling 'perf c2c' on Arm SPE
on the repo:

https://git.linaro.org/people/leo.yan/linux-spe.git branch: perf_c2c_arm_spe_peer_v3

Below are the quick notes for build the kernel with enabling Arm SPE:

  $ git clone -b perf_c2c_arm_spe_peer_v3 https://git.linaro.org/people/leo.yan/linux-spe.git

  Or

  $ git clone -b perf_c2c_arm_spe_peer_v3 ssh://git@....linaro.org/people/leo.yan/linux-spe.git

  $ cd linux-spe

  # Build kernel
  $ make defconfig
  $ ./scripts/config -e CONFIG_PID_IN_CONTEXTIDR
  $ ./scripts/config -e CONFIG_ARM_SPE_PMU
  $ make Image

  # Build perf
  $ cd tools/perf
  $ make VF=1 DEBUG=1

When boot the kernel, please add option "kpti=off" in kernel command
line, you might need to update grub menu for this.

Please feel free let us know if anything is not clear for you.

Thank you,
Leo