linux-kernel - Re: [PATCH V6 06/13] perf: Add Nehalem and Sandy Bridge uncore support

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Message-ID: <CABPqkBR6FXo-uKFGVgVCgjycSqZ6Ye5r5f6HB35zD9auQRcr5w@mail.gmail.com>
Date:	Fri, 15 Jun 2012 20:47:02 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>, mingo@...e.hu,
	jolsa@...hat.com, andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 06/13] perf: Add Nehalem and Sandy Bridge uncore support

On Fri, Jun 15, 2012 at 7:29 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Fri, 2012-06-15 at 14:31 +0800, Yan, Zheng wrote:
>> +static struct uncore_event_desc nhm_uncore_events[] = {
>> +       INTEL_UNCORE_EVENT_DESC(CLOCKTICKS, "config=0xffff"),
>
> Why does that use config=0xffff, also I couldn't find event 0xff listed,
> is it special-cased somewhere?
That's becase some uncore have 1 fixed counter to count uncore cycles.
That means no specific encoding, so we need to make one up just like
for core PMU and the ref-cycle event.

>
>> +       /* full cache line writes to DRAM */
>> +       INTEL_UNCORE_EVENT_DESC(QMC_WRITES_FULL_ANY, "event=0x2f,umask=0xf"),
>> +       /* Quickpath Memory Controller normal priority read requests */
>> +       INTEL_UNCORE_EVENT_DESC(QMC_NORMAL_READS_ANY, "event=0x2c,umask=0xf"),
>> +       /* Quickpath Home Logic read requests from the IOH */
>> +       INTEL_UNCORE_EVENT_DESC(QHL_REQUEST_IOH_READS,
>> +                               "event=0x20,umask=0x1"),
>> +       /* Quickpath Home Logic write requests from the IOH */
>> +       INTEL_UNCORE_EVENT_DESC(QHL_REQUEST_IOH_WRITES,
>> +                               "event=0x20,umask=0x2"),
>> +       /* Quickpath Home Logic read requests from a remote socket */
>> +       INTEL_UNCORE_EVENT_DESC(QHL_REQUEST_REMOTE_READS,
>> +                               "event=0x20,umask=0x4"),
>> +       /* Quickpath Home Logic write requests from a remote socket */
>> +       INTEL_UNCORE_EVENT_DESC(QHL_REQUEST_REMOTE_WRITES,
>> +                               "event=0x20,umask=0x8"),
>> +       /* Quickpath Home Logic read requests from the local socket */
>> +       INTEL_UNCORE_EVENT_DESC(QHL_REQUEST_LOCAL_READS,
>> +                               "event=0x20,umask=0x10"),
>> +       /* Quickpath Home Logic write requests from the local socket */
>> +       INTEL_UNCORE_EVENT_DESC(QHL_REQUEST_LOCAL_WRITES,
>> +                               "event=0x20,umask=0x20"),
>> +       { /* end: all zeroes */ },
>> +};
>
> The rest of the events seem to be valid on both NHM and WSM, I didn't
> look very closely, but it looks like WSM has a few extra events, but
> includes all NHM events.
>
>
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