linux-kernel - Re: [PATCH] perf test: Add watchpoint test

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Date:   Wed, 12 Sep 2018 08:45:47 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        tmricht@...ux.ibm.com, sandipan@...ux.ibm.com,
        brueckner@...ux.ibm.com, kim.phillips@....com,
        kstewart@...uxfoundation.org, tglx@...utronix.de,
        naveen.n.rao@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH] perf test: Add watchpoint test


> While testing, I got curious, as a 'perf test' user, why one of the
> tests had the "Skip" result:
> 
> [root@...enth ~]# perf test watchpoint
> 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
> [root@...enth ~]#
> 
> I tried with 'perf test -v watchpoint' but that didn't help, perhaps you
> could add some message after the "Skip" telling why it skipped that
> test? I.e. hardware doesn't have that capability, kernel driver not yet
> supporting that, something else?

Sure will add a message:

pr_debug("Hardware does not support read only watchpoints.");

Ravi