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

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Date:	Fri, 15 Jun 2012 19:18:50 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	mingo@...e.hu, jolsa@...hat.com, eranian@...gle.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, 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"),
> +       /* 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 */ },
> +}; 

Should we lowercase all event names as well?

/sys/bus/event_source/devices/uncore/events
/sys/bus/event_source/devices/uncore/events/QHL_REQUEST_REMOTE_READS
/sys/bus/event_source/devices/uncore/events/QHL_REQUEST_LOCAL_READS
/sys/bus/event_source/devices/uncore/events/QHL_REQUEST_IOH_READS
/sys/bus/event_source/devices/uncore/events/QHL_REQUEST_REMOTE_WRITES
/sys/bus/event_source/devices/uncore/events/QMC_WRITES_FULL_ANY
/sys/bus/event_source/devices/uncore/events/QMC_NORMAL_READS_ANY
/sys/bus/event_source/devices/uncore/events/QHL_REQUEST_LOCAL_WRITES
/sys/bus/event_source/devices/uncore/events/QHL_REQUEST_IOH_WRITES
/sys/bus/event_source/devices/uncore/events/CLOCKTICKS

BTW we could encode those things like:

INTEL_UNCORE_EVENT_DESC(qhl_request_local_reads, 0x1020);

And have the print function decode that into something pretty, it would
save some 18 bytes per event or so. Not sure that's worth it, but who
knows.


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