linux-kernel - Re: [PATCH] perf stat: Add support for s390 transaction counters

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Date:   Wed, 14 Mar 2018 09:34:48 +0100
From:   Thomas-Mich Richter <tmricht@...ux.vnet.ibm.com>
To:     Andi Kleen <ak@...ux.intel.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] perf stat: Add support for s390 transaction counters

On 03/13/2018 04:23 AM, Andi Kleen wrote:
> Thomas Richter <tmricht@...ux.vnet.ibm.com> writes:
> 
>> Right now there is only hard coded support for x86.
> 
> That's not true. There is support for generic transaction events in perf.
> 
> As far as I can tell your events would map 1:1 to the generic tx-* events.
> 
> -Andi
> 

I might be wrong, but when I look at function add_default_attributes()
in file buildin-stat.c the string variables transaction_attrs
and transaction_limited_attrs are used when flag T is specified on command line:

/* Default events used for perf stat -T */
static const char *transaction_attrs = {
        "task-clock,"
        "{"
        "instructions,"
        "cycles,"
        "cpu/cycles-t/,"
        "cpu/tx-start/,"
        "cpu/el-start/,"
        "cpu/cycles-ct/"
        "}"
};

These PMU events show up on my x86 notebook but no on the s390.
That's why I came to this conclusion. I have not tried other architectures.
-- 
Thomas Richter, Dept 3303, IBM LTC Boeblingen Germany
--
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