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

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Date:   Wed, 14 Mar 2018 08:43:17 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Thomas-Mich Richter <tmricht@...ux.vnet.ibm.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com
Subject: Re: [PATCH] perf stat: Add support for s390 transaction counters

> S390 has no support for Elision and uses transaction begin/end/abort
> instructions. The CPU measurement counter facility provides counters for
> transaction end and transaction abort.

You don't need to implement the el-* events.

> I have used this table (taken from arch/x86/events/intel/core.c) as giudeline:
> /* Haswell special events */
> EVENT_ATTR_STR(tx-start,        tx_start,       "event=0xc9,umask=0x1");
> EVENT_ATTR_STR(tx-commit,       tx_commit,      "event=0xc9,umask=0x2");
> EVENT_ATTR_STR(tx-abort,        tx_abort,       "event=0xc9,umask=0x4");
> EVENT_ATTR_STR(tx-capacity,     tx_capacity,    "event=0x54,umask=0x2");
> EVENT_ATTR_STR(tx-conflict,     tx_conflict,    "event=0x54,umask=0x1");
> EVENT_ATTR_STR(el-start,        el_start,       "event=0xc8,umask=0x1");
> EVENT_ATTR_STR(el-commit,       el_commit,      "event=0xc8,umask=0x2");
> EVENT_ATTR_STR(el-abort,        el_abort,       "event=0xc8,umask=0x4");
> EVENT_ATTR_STR(el-capacity,     el_capacity,    "event=0x54,umask=0x2");
> EVENT_ATTR_STR(el-conflict,     el_conflict,    "event=0x54,umask=0x1");
> EVENT_ATTR_STR(cycles-t,        cycles_t,       "event=0x3c,in_tx=1");
> EVENT_ATTR_STR(cycles-ct,       cycles_ct,      "event=0x3c,in_tx=1,in_tx_cp=1");
> 
> 
> So s390 can only support tx_commit and tx-abort symbolic names.
> None of them show up in the transactions_attrs and transaction_limited_attrs
> string variables used in builtin-stat.c file.

We could change perf stat to fall back to only tx commit and tx abort.
We already did that for one limited case.

-Andi