linux-kernel - Re: [PATCH v2] perf test: S390 does not support watchpoints in test 22

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Date:   Fri, 28 Sep 2018 15:47:18 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Thomas-Mich 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,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH v2] perf test: S390 does not support watchpoints in test
 22

Hi Thomas,

On 09/28/2018 03:32 PM, Thomas-Mich Richter wrote:
> I can rework the patch to use the is_supported() member function. The
> down side is that the test does not show up in the list of executed tests anymore,
> unless some debug output is enabled:

Which should be fine because s390 is doing that in all breakpoint related tests.
But more important thing to suggest .is_supported field is, this patch has a
regression on x86:

Before:
  $ sudo ./perf test 22
  22: Watchpoint                                            :
  22.1: Read Only Watchpoint                                : Skip
  22.2: Write Only Watchpoint                               : Ok
  22.3: Read / Write Watchpoint                             : Ok
  22.4: Modify Watchpoint                                   : Ok

After:
  $ git apply 1.patch
  $ make
  $ sudo ./perf test 22
  22: Watchpoint                                            :
  22.1: Read Only Watchpoint                                : Skip
  22.2: Write Only Watchpoint                               : Skip
  22.3: Read / Write Watchpoint                             : Skip
  22.4: Modify Watchpoint                                   : Skip

Intel hw does not support read only watchpoitns. If you use skip_if_fail=true,
all subsequent testcases are skipped as well.

Thanks,
Ravi