perf pmu-events x86: Use CPU_CLK_UNHALTED.THREAD in Kernel_Utilization metric

The kernel utilization metric does multiplexing currently and is somewhat
unreliable. The problem is that it

perf pmu-events x86: Use CPU_CLK_UNHALTED.THREAD in Kernel_Utilization metric

The kernel utilization metric does multiplexing currently and is somewhat
unreliable. The problem is that it uses two instances of the fixed counter,
and the kernel has to multipleplex which causes errors. So should use
CPU_CLK_UNHALTED.THREAD instead.

Before:

# perf stat -M Kernel_Utilization -- sleep 1

Performance counter stats for 'sleep 1':

1,419,425 cpu_clk_unhalted.ref_tsc:k
<not counted> cpu_clk_unhalted.ref_tsc (0.00%)

After:

# perf stat -M Kernel_Utilization -- sleep 1

Performance counter stats for 'sleep 1':

746,688 cpu_clk_unhalted.thread:k # 0.7 Kernel_Utilization
1,088,348 cpu_clk_unhalted.thread

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200309013125.7559-1-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf vendor events intel: Add NO_NMI_WATCHDOG metric constraint

Add NO_NMI_WATCHDOG metric constraint to Page_Walks_Utilization for Sky Lake
and Cascade Lake.

Committer testing:

perf vendor events intel: Add NO_NMI_WATCHDOG metric constraint

Add NO_NMI_WATCHDOG metric constraint to Page_Walks_Utilization for Sky Lake
and Cascade Lake.

Committer testing:

On a Lenovo T480S, Intel(R) Core(TM) i7-8650U Kaby Lake, that looking at x86's
mapfile.csv file is a:

$ grep -w skylake tools/perf/pmu-events/arch/x86/mapfile.csv
GenuineIntel-6-[4589]E,v24,skylake,core
$

So uses the constraint added in this patch in this file:

tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json

Before:

# perf stat -a -M Page_Walks_Utilization sleep 2

Performance counter stats for 'system wide':

<not counted> itlb_misses.walk_pending (0.00%)
<not counted> dtlb_load_misses.walk_pending (0.00%)
<not counted> dtlb_store_misses.walk_pending (0.00%)
<not counted> ept.walk_pending (0.00%)
<not counted> cycles (0.00%)

2.001750514 seconds time elapsed

Some events weren't counted. Try disabling the NMI watchdog:
echo 0 > /proc/sys/kernel/nmi_watchdog
perf stat ...
echo 1 > /proc/sys/kernel/nmi_watchdog
The events in group usually have to be from the same PMU. Try reorganizing the group.
#

After:

# perf stat -a -M Page_Walks_Utilization sleep 2
Splitting metric group Page_Walks_Utilization into standalone metrics.
Try disabling the NMI watchdog to comply NO_NMI_WATCHDOG metric constraint:
echo 0 > /proc/sys/kernel/nmi_watchdog
perf stat ...
echo 1 > /proc/sys/kernel/nmi_watchdog
,
Performance counter stats for 'system wide':

36,883,102 itlb_misses.walk_pending # 0.1 Page_Walks_Utilization (79.99%)
123,104,146 dtlb_load_misses.walk_pending (80.02%)
13,720,795 dtlb_store_misses.walk_pending (79.99%)
0 ept.walk_pending (79.99%)
1,519,948,400 cycles (80.01%)

2.002170780 seconds time elapsed

#

Before and after, if we disable the nmi_watchdog we get:

# echo 0 > /proc/sys/kernel/nmi_watchdog
# perf stat -a -M Page_Walks_Utilization sleep 2

Performance counter stats for 'system wide':

33,721,658 itlb_misses.walk_pending # 0.1 Page_Walks_Utilization
84,070,996 dtlb_load_misses.walk_pending
9,816,071 dtlb_store_misses.walk_pending
0 ept.walk_pending
704,920,899 cycles

2.002331670 seconds time elapsed

#

More information about the metric expressions:

# perf stat -v -a -M Page_Walks_Utilization sleep 2
Using CPUID GenuineIntel-6-8E-A
metric expr ( itlb_misses.walk_pending + dtlb_load_misses.walk_pending + dtlb_store_misses.walk_pending + ept.walk_pending ) / ( 2 * cycles ) for Page_Walks_Utilization
found event itlb_misses.walk_pending
found event dtlb_load_misses.walk_pending
found event dtlb_store_misses.walk_pending
found event ept.walk_pending
found event cycles
adding {itlb_misses.walk_pending,dtlb_load_misses.walk_pending,dtlb_store_misses.walk_pending,ept.walk_pending,cycles}:W
-> cpu/umask=0x10,(null)=0x186a3,event=0x85/
-> cpu/umask=0x10,(null)=0x1e8483,event=0x8/
-> cpu/umask=0x10,(null)=0x1e8483,event=0x49/
-> cpu/umask=0x10,(null)=0x1e8483,event=0x4f/
itlb_misses.walk_pending: 8085772 16010162799 16010162799
dtlb_load_misses.walk_pending: 28134579 16010162799 16010162799
dtlb_store_misses.walk_pending: 7276535 16010162799 16010162799
ept.walk_pending: 2 16010162799 16010162799
cycles: 315140605 16010162799 16010162799

Performance counter stats for 'system wide':

8,085,772 itlb_misses.walk_pending # 0.1 Page_Walks_Utilization
28,134,579 dtlb_load_misses.walk_pending
7,276,535 dtlb_store_misses.walk_pending
2 ept.walk_pending
315,140,605 cycles

2.002333181 seconds time elapsed

#

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Link: http://lore.kernel.org/lkml/1582581564-184429-6-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf/x86/pmu-events: Fix Kernel_Utilization metric

Kernel Utilization should divide ref cycles spent in kernel with total
ref cycles.

Signed-off-by: Ravi Bangoria <ravi.bangoria

perf/x86/pmu-events: Fix Kernel_Utilization metric

Kernel Utilization should divide ref cycles spent in kernel with total
ref cycles.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Haiyan Song <haiyanx.song@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20191204162121.29998-1-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf vendor events intel: Update all the Intel JSON metrics from TMAM 3.6.

New Metrics:

- DSB_Switches: fraction of cycles CPU was stalled due to switches from DSB to MITE pipeline

perf vendor events intel: Update all the Intel JSON metrics from TMAM 3.6.

New Metrics:

- DSB_Switches: fraction of cycles CPU was stalled due to switches from DSB to MITE pipeline [all]
- L2_Evictions_{Silent|NonSilent}_PKI: L2 {silent|non silent} ecivtions rate per Kilo instruction [SKX+]
- IpFarBranch - Instructions per Far Branch

Other Enhancements & fixes:

- KBLR/CFL & CLX move to separate columns (no column sharing via if #model)
- Re-organized/renamed Metric Group

Signed-off-by: Haiyan Song <haiyanx.song@intel.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Link: http://lore.kernel.org/lkml/20191030082308.10919-1-haiyanx.song@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf vendor events intel: Metric fixes for SKX/CLX

- Add a missing filter for the DRAM_Latency / DRAM_Parallel_Reads metrics
- Remove the useless PMM_* metrics from Skylake

Sign

perf vendor events intel: Metric fixes for SKX/CLX

- Add a missing filter for the DRAM_Latency / DRAM_Parallel_Reads metrics
- Remove the useless PMM_* metrics from Skylake

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190628220737.13259-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf vendor events intel: Update metrics from TMAM 3.5

Update all the Intel JSON metrics from Ahmad Yasin's TMAM 3.5
for Intel big core from Sandy Bridge to Cascade Lake.

This h

perf vendor events intel: Update metrics from TMAM 3.5

Update all the Intel JSON metrics from Ahmad Yasin's TMAM 3.5
for Intel big core from Sandy Bridge to Cascade Lake.

This has many improvements and new metircs

- New TopDownL1_SMT group that provides a per SMT thread version
of --topdown that does not require -a anymore. The drawback is
increased multiplexing though since L1 TopDown does not fit into
4 generic counters anymore.

- Added SMT aware versions of other metrics

- Split SMT aware metrics into separate metrics to avoid
unnecessary event collections

- New metrics for better branch analysis:
Estimated Branch_Mispredict_Costs, Instructions per taken Branch,
Branch Instructions per Taken Branch, etc.

- Instruction mix metrics:
Instructions per load, Instructions per store, Instructions per Branch,
Instructions per Call

- New Cache metrics:
Bandwidth to L1/L2/L3 caches. L1/L2/L3 misses per kilo instructions.
memory level parallelism

- New memory controller metrics:
Normalized memory bandwidth in interval mode, Average memory latency,
Average number of parallel read requests,

- 3DXP persistent memory metrics for Cascade Lake:
3dxp read latency, 3dxp read/write bandwidth

- Some other useful metrics like Instruction Level Parallelism,

- Various other improvements.

Not all metrics are available on all CPUs. Skylake has best coverage.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lkml.kernel.org/r/20190315165219.GA21223@tassilo.jf.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf vendor events intel: Fix Load_Miss_Real_Latency on CLX

Fix incorrect event names for the Load_Miss_Real_Latency metric for
Cascadelake server in the same manner as commit 91b2b97025

perf vendor events intel: Fix Load_Miss_Real_Latency on CLX

Fix incorrect event names for the Load_Miss_Real_Latency metric for
Cascadelake server in the same manner as commit 91b2b97025 for SKL/SKX.

Signed-off-by: William Cohen <wcohen@redhat.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190129170536.22510-1-wcohen@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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perf vendor events: Add JSON metrics for Cascadelake server

Add JSON metrics (based on event list v1) for Cascadelake server

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>

perf vendor events: Add JSON metrics for Cascadelake server

Add JSON metrics (based on event list v1) for Cascadelake server

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/3ab97c73-c197-8555-1a35-b54636e667e6@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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