From: Florian Fainelli <f.fainelli@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: linux-arm-kernel@lists.infradead.org,
Ravi Bangoria <ravi.bangoria@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Kim Phillips <kim.phillips@arm.com>,
Thomas Richter <tmricht@linux.ibm.com>,
open list <linux-kernel@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
rmk+kernel@armlinux.org.uk, Ingo Molnar <mingo@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Namhyung Kim <namhyung@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jiri Olsa <jolsa@redhat.com>,
l.stach@pengutronix.de
Subject: Re: [PATCH 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page
Date: Thu, 25 Oct 2018 10:19:54 -0700 [thread overview]
Message-ID: <175fd725-a97a-c282-5aa1-952014ff9023@gmail.com> (raw)
In-Reply-To: <20181025021013.GA30116@lunn.ch>
On 10/24/18 7:10 PM, Andrew Lunn wrote:
> On Wed, Oct 24, 2018 at 05:09:05PM -0700, Florian Fainelli wrote:
>> perf on ARM requires CONFIG_KUSER_HELPERS to be turned on to allow some
>> independance with respect to the ARM CPU being used. Add a test which
>> tries to locate the [vectors] page, created when CONFIG_KUSER_HELPERS is
>> turned on to help asses the system's health.
>
> Hi Florian
>
> I've suffered the pain from missing CONFIG_KUSER_HELPERS. The
> segfaults give little clue as to what is going wrong,and gdb is not
> much use either.
If you have a working backtrace, you can typically see the virtual
address being in 0xffff_xxxx which gives a bit of a clue, but yes, this
is not particularly helpful.
>
> What i don't see here is any clue to CONFIG_KUSER_HELPERS. If the test
> fails, could you print a message suggesting CONFIG_KUSER_HELPERS on
> ARM?
Sure, sounds reasonable, thanks for taking a look.
--
Florian
next prev parent reply other threads:[~2018-10-25 17:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-25 0:09 [PATCH 0/2] perf tests: Check for ARM [vectors] page Florian Fainelli
2018-10-25 0:09 ` [PATCH 1/2] perf tools: Make find_vdso_map() more modular Florian Fainelli
2018-10-25 0:14 ` Florian Fainelli
2018-10-25 0:09 ` [PATCH 2/2] perf tests: Add a test for the ARM 32-bit [vectors] page Florian Fainelli
2018-10-25 2:10 ` Andrew Lunn
2018-10-25 17:19 ` Florian Fainelli [this message]
2018-10-25 17:32 ` Russell King - ARM Linux
2018-10-25 17:53 ` Florian Fainelli
2018-10-25 18:03 ` Russell King - ARM Linux
2018-10-31 22:21 ` [PATCH 0/2] perf tests: Check for ARM " Florian Fainelli
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