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From: "Jin, Yao" <yao.jin@linux.intel.com>
To: stable@vger.kernel.org
Cc: "Liang, Kan" <kan.liang@intel.com>,
	Andi Kleen <ak@linux.intel.com>, "Jin, Yao" <yao.jin@intel.com>
Subject: perf/x86/intel/uncore: propose to support IIO free-running counters in 4.14
Date: Tue, 28 Aug 2018 11:11:02 +0800	[thread overview]
Message-ID: <9c910580-0f24-7652-3e2a-6a4b606a033d@linux.intel.com> (raw)

Hi,

The upstream kernel has supported IIO free-running counters on Skylake 
server. As of Skylake Server, there are a number of free running 
counters in each IIO Box that collect counts of per-box IO clocks and 
per-port Input/Output x BW/Utilization.

There are three types of IIO free-running counters on Skylake server:

1. IO CLOCKS counter: a clock of IIO box.

2. BANDWIDTH counters: count inbound(PCIe->CPU)/outbound(CPU->PCIe) 
bandwidth.

3. UTILIZATION counters: count input/output utilization.

With these IIO free-running counters, we can get good observation for 
IIO traffic on Skylake server. For example, we can see the IIO inbound 
bandwidth (PCIe->CPU).

root@skx /sys/devices# perf stat -a -e 
uncore_iio_free_running_2/bw_in_port0/
^C
  Performance counter stats for 'system wide':

             153.19 MiB  uncore_iio_free_running_2/bw_in_port0/

        8.037701069 seconds time elapsed

I propose to backport the patches which support IIO free-running 
counters to 4.14 stable kernel.

perf/x86/intel/uncore: Introduce customized event_read() for client IMC 
uncore
2da331465f44f9618abe8837d1a68405d550b66e

perf/x86/intel/uncore: Add new data structures for free running counters
927b2deb067b8b4753fc09c7a42092f43fc0c1f6

perf/x86/intel/uncore: Add infrastructure for free running counters
0e0162dfcd1fbe4c711ee86f24f966c318999603

perf/x86/intel/uncore: Support IIO free-running counters on SKX
0f519f0352e37e7d71bdce5559517c74a35f6e33

perf/x86/intel/uncore: Expose uncore_pmu_event*() functions
5a6c9d94e9ed7410142bc6fcb638a4db1895aa0c

perf/x86/intel/uncore: Clean up client IMC uncore
9aae1780e7e81e54edfb70ba33ead5b0b48be009

Thanks
Jin Yao

             reply	other threads:[~2018-08-28  7:00 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-28  3:11 Jin, Yao [this message]
2018-08-28  5:17 ` perf/x86/intel/uncore: propose to support IIO free-running counters in 4.14 Greg KH
2018-08-28  6:23   ` Jin, Yao
2018-08-28 12:43     ` Greg KH
2018-08-29  1:11       ` Jin, Yao

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