perf test: Parse 'perf stat' Topdown events for aarch64

JIRA: https://issues.redhat.com/browse/RHEL-78426

upstream
========
commit 625f4de
Author: Veronika Molnarova <[email protected]>
Date:   Tue Oct 29 15:43:47 2024 +0100

description
===========
The 'perf stat' output on aarch64 machines with topdown events wasn't
counted for in the 'perf stat STD output linter' test case. Add the
topdown metric to the skip_metric list as it is done for topdown events
on other systems.

The Topdown events are also disabled on aarch64 KVM guests because the
value of caps/slots is set to 0 due to the part of the system register
being a stub.

This prevents the metric for the topdown events from being computed,
leaving the 'perf stat' topdown metric without any value at all.

Add the "TopdownL1" to the skip_metric list as well to handle this
possibility.

Before aarch64:

    100: perf stat STD output linter:
    --- start ---
    test child forked, pid 403305
    Checking STD output: no args Unknown event name in TopdownL1   #      4.3 percent of slots  slots_lost_misspeculation_fraction
    ---- end(-1) ----
    100: perf stat STD output linter                             : FAILED!

Before aarch64 KVM:

    100: perf stat STD output linter:
    --- start ---
    test child forked, pid 404671
    Checking STD output: no args Unknown event name in TopdownL1
    ---- end(-1) ----
    100: perf stat STD output linter                             : FAILED!

After:

    100: perf stat STD output linter:
    --- start ---
    test child forked, pid 404777
    Checking STD output: no args [Success]
    Checking STD output: system wide [Success]
    Checking STD output: interval [Success]
    Checking STD output: per thread [Success]
    Checking STD output: per node [Success]
    Checking STD output: system wide no aggregation [Success]
    Checking STD output: per core [Success]
    Checking STD output: per cache instance [Success]
    Checking STD output: per cluster [Success]
    Checking STD output: per die [Success]
    Checking STD output: per socket [Success]
    ---- end(0) ----
    100: perf stat STD output linter                                     : Ok

    Signed-off-by: Veronika Molnarova <[email protected]>
    Acked-by: Ian Rogers <[email protected]>
    Cc: Adrian Hunter <[email protected]>
    Cc: Alexander Shishkin <[email protected]>
    Cc: Ingo Molnar <[email protected]>
    Cc: Jiri Olsa <[email protected]>
    Cc: Kan Liang <[email protected]>
    Cc: Mark Rutland <[email protected]>
    Cc: Michael Petlan <[email protected]>
    Cc: Namhyung Kim <[email protected]>
    Cc: Peter Zijlstra <[email protected]>
    Cc: Tim Chen <[email protected]>
    Cc: Yicong Yang <[email protected]>
    Link: https://lore.kernel.org/r/[email protected]
    Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Signed-off-by: Anubhav Shelat <[email protected]>

Author: AnubhavS1

tools/perf/tests/shell/stat+std_output.sh

@@ -13,7 +13,7 @@ stat_output=$(mktemp /tmp/__perf_test.stat_output.std.XXXXX)
 
 event_name=(cpu-clock task-clock context-switches cpu-migrations page-faults stalled-cycles-frontend stalled-cycles-backend cycles instructions branches branch-misses)
 event_metric=("CPUs utilized" "CPUs utilized" "/sec" "/sec" "/sec" "frontend cycles idle" "backend cycles idle" "GHz" "insn per cycle" "/sec" "of all branches")
-skip_metric=("stalled cycles per insn" "tma_" "retiring" "frontend_bound" "bad_speculation" "backend_bound")
+skip_metric=("stalled cycles per insn" "tma_" "retiring" "frontend_bound" "bad_speculation" "backend_bound" "TopdownL1" "percent of slots")
 
 cleanup() {
   rm -f "${stat_output}"