linux-kernel - Re: [PATCH] pert/report: Support s390 diag event display on x86

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Message-Id: <20190521133638.GB10877@linux.ibm.com>
Date:   Tue, 21 May 2019 15:36:38 +0200
From:   Hendrik Brueckner <brueckner@...ux.ibm.com>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, brueckner@...ux.vnet.ibm.com,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH] pert/report: Support s390 diag event display on x86

On Mon, May 20, 2019 at 04:42:42PM +0200, Thomas Richter wrote:
> Perf report fails to display s390 specific event numbered bd000
> on an x86 platform. For example on s390 this works without error:
> 
> [root@...lp76 perf]# uname -m
> s390x
> [root@...lp76 perf]# ./perf record -e rbd000 -- find / >/dev/null
> [ perf record: Woken up 3 times to write data ]
> [ perf record: Captured and wrote 0.549 MB perf.data ]
> [root@...lp76 perf]# ./perf report -D --stdio  > /dev/null
> [root@...lp76 perf]#
> 
> Transfering this perf.data file to an x86 platform and executing
> the same report command produces:
> 
> [root@f29 perf]# uname -m
> x86_64
> [root@f29 perf]# ./perf report -i ~/perf.data.m35lp76 --stdio
> interpreting bpf_prog_info from systems with endianity is not yet supported
> interpreting btf from systems with endianity is not yet supported
> 0x8c890 [0x8]: failed to process type: 68
> Error:
> failed to process sample
> 
> Event bd000 generates auxiliary data which is stored in big endian
> format in the perf data file.
> This error is caused by missing endianess handling on the x86 platform
> when the data is displayed. Fix this by handling s390 auxiliary event
> data depending on the local platform endianness.
> 
> Output after on x86:
> 
> [root@f29 perf]# ./perf report -D -i ~/perf.data.m35lp76 --stdio > /dev/null
> interpreting bpf_prog_info from systems with endianity is not yet supported
> interpreting btf from systems with endianity is not yet supported
> [root@f29 perf]#
> 
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> ---
>  tools/perf/util/s390-cpumsf.c | 95 ++++++++++++++++++++++++++++-------
>  1 file changed, 77 insertions(+), 18 deletions(-)
> 

Looks sane to me.

Thanks, Thomas.

Reviewed-by: Hendrik Brueckner <brueckner@...ux.ibm.com>