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Yicong Yang cbc917a1b0 perf stat: Support per-cluster aggregation 
Some platforms have 'cluster' topology and CPUs in the cluster will
share resources like L3 Cache Tag (for HiSilicon Kunpeng SoC) or L2
cache (for Intel Jacobsville). Currently parsing and building cluster
topology have been supported since [1].

perf stat has already supported aggregation for other topologies like
die or socket, etc. It'll be useful to aggregate per-cluster to find
problems like L3T bandwidth contention.

This patch add support for "--per-cluster" option for per-cluster
aggregation. Also update the docs and related test. The output will
be like:

[root@localhost tmp]# perf stat -a -e LLC-load --per-cluster -- sleep 5

 Performance counter stats for 'system wide':

S56-D0-CLS158    4      1,321,521,570      LLC-load
S56-D0-CLS594    4        794,211,453      LLC-load
S56-D0-CLS1030    4             41,623      LLC-load
S56-D0-CLS1466    4             41,646      LLC-load
S56-D0-CLS1902    4             16,863      LLC-load
S56-D0-CLS2338    4             15,721      LLC-load
S56-D0-CLS2774    4             22,671      LLC-load
[...]

On a legacy system without cluster or cluster support, the output will
be look like:
[root@localhost perf]# perf stat -a -e cycles --per-cluster -- sleep 1

 Performance counter stats for 'system wide':

S56-D0-CLS0   64         18,011,485      cycles
S7182-D0-CLS0   64         16,548,835      cycles

Note that this patch doesn't mix the cluster information in the outputs
of --per-core to avoid breaking any tools/scripts using it.

Note that perf recently supports "--per-cache" aggregation, but it's not
the same with the cluster although cluster CPUs may share some cache
resources. For example on my machine all clusters within a die share the
same L3 cache:
$ cat /sys/devices/system/cpu/cpu0/cache/index3/shared_cpu_list
0-31
$ cat /sys/devices/system/cpu/cpu0/topology/cluster_cpus_list
0-3

[1] commit c5e22feffd ("topology: Represent clusters of CPUs within a die")

Tested-by: Jie Zhan <zhanjie9@hisilicon.com>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Cc: james.clark@arm.com
Cc: 21cnbao@gmail.com
Cc: prime.zeng@hisilicon.com
Cc: Jonathan.Cameron@huawei.com
Cc: fanghao11@huawei.com
Cc: linuxarm@huawei.com
Cc: tim.c.chen@intel.com
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240208024026.2691-1-yangyicong@huawei.com
2024-02-09 14:59:53 -08:00
..
coresight.sh perf test: Skip CoreSight tests if cs_etm// event is not available 2023-10-25 10:02:01 -07:00
perf_has_symbol.sh perf tests lib: Add perf_has_symbol.sh 2023-11-27 15:39:55 -03:00
perf_json_output_lint.py perf stat: Support per-cluster aggregation 2024-02-09 14:59:53 -08:00
perf_metric_validation_rules.json perf test: Add skip list for metrics known would fail 2023-06-21 22:23:57 -07:00
perf_metric_validation.py perf test: Simplify metric value validation test final report 2024-02-01 22:16:37 -08:00
probe_vfs_getname.sh perf tests lib probe_vfs_getname: Fix shellcheck warnings about missing shebang/local variables 2023-08-03 17:01:26 -03:00
probe.sh perf tests lib probe: Fix shellcheck warning about about missing shebang 2023-08-03 17:01:26 -03:00
setup_python.sh perf test: Use common python setup library 2023-12-05 15:48:52 -03:00
stat_output.sh perf stat: Support per-cluster aggregation 2024-02-09 14:59:53 -08:00
waiting.sh perf tests lib waiting: Fix the shellcheck warnings about missing shebang 2023-08-03 17:01:26 -03:00