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Message-ID: <82a6f9b2-bb17-babd-fbe0-c4a5bec1203b@intel.com>
Date: Wed, 22 Feb 2023 15:32:47 -0800
From: "Joseph, Jithu" <jithu.joseph@...el.com>
To: Dave Hansen <dave.hansen@...el.com>, <hdegoede@...hat.com>,
<markgross@...nel.org>
CC: <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
<dave.hansen@...ux.intel.com>, <x86@...nel.org>, <hpa@...or.com>,
<gregkh@...uxfoundation.org>, <rostedt@...dmis.org>,
<ashok.raj@...el.com>, <tony.luck@...el.com>,
<linux-kernel@...r.kernel.org>,
<platform-driver-x86@...r.kernel.org>, <patches@...ts.linux.dev>,
<ravi.v.shankar@...el.com>, <thiago.macieira@...el.com>,
<athenas.jimenez.gonzalez@...el.com>, <sohil.mehta@...el.com>
Subject: Re: [PATCH v2 4/7] platform/x86/intel/ifs: Implement Array BIST test
On 2/22/2023 2:28 PM, Dave Hansen wrote:
> On 2/22/23 14:07, Joseph, Jithu wrote:
>> Since the trace has to be explicitly enabled (I thought it is okay to
>> add a more convenient custom one only to be enabled for detailed
>> analysis when required).
>
> man perf-script
>
> You should be able to write one to do exactly what you need in about 10
> minutes. No new tracepoints, no new kernel code to maintain. Knock
Thanks for the pointers. I gather that user level tools might be able to format the
msr trace output in a more convenient way (perhaps as generated by the custom driver trace)
There is still the other convenience of not having to look-up the
MSRs addresses corresponding to all the individual tests and setting the filter on them to
analyze IFS test activity (rather than enabling it via echo 1 > /sys/kernel/debug/tracing/events/intel_ifs/enable)
Agreed that for array test it is a single MSR. For other test, it is 2 separate MSRs ... there could be additional
tests in the future.
Jithu
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