[Patch v4] perf tests: Add auto counter reload (ACR) sampling test

[Dapeng Mi]

Add auto counter reload sampling test to verify that the intended event
records can be captured and the self-reloaded events won't generate any
records.

Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
---

V4: Remove model-specific ACR sampling test in ratio_to_prev test to
avoid false positive. Some hybrid platforms only support ACR on E-cores,
e.g., PTL. If the test process is scheduled on P-core, it leads to false
positive since P-core doesn't support ACR. test_acr_sampling() is
already fair enough to validate ACR sampling functionalities.

History:
V3: https://lore.kernel.org/all/20260421045511.2401316-1-dapeng1.mi@xxxxxxxxxxxxxxx/
V2: https://lore.kernel.org/all/20260420025501.2133495-1-dapeng1.mi@xxxxxxxxxxxxxxx/
v1: https://lore.kernel.org/all/20260413010920.546501-1-dapeng1.mi@xxxxxxxxxxxxxxx/

 tools/perf/tests/shell/record.sh | 43 ++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
index 7cb81cf3444a..5819f11ad3a9 100755
--- a/tools/perf/tests/shell/record.sh
+++ b/tools/perf/tests/shell/record.sh
@@ -402,6 +402,48 @@ test_callgraph() {
   echo "Callgraph test [Success]"
 }
 
+test_acr_sampling() {
+  events="{instructions/period=40000,acr_mask=0x2/u,cycles/period=20000,acr_mask=0x3/u}"
+  pebs_events="{instructions/period=40000,acr_mask=0x2/pu,cycles/period=20000,acr_mask=0x3/u}"
+  echo "Auto counter reload (ACR) sampling test"
+  if ! perf record -o "${perfdata}" -e "${events}" ${testprog} 2> /dev/null
+  then
+    echo "Auto counter reload sampling [Skipped not supported]"
+    return
+  fi
+  if ! perf script -i "${perfdata}" -F event | grep -q "instructions"
+  then
+    echo "Auto counter reload sampling [Failed missing instructions event]"
+    err=1
+    return
+  fi
+  if perf script -i "${perfdata}" -F event | grep -q "cycles"
+  then
+    echo "Auto counter reload sampling [Failed cycles event shouldn't be sampled]"
+    err=1
+    return
+  fi
+  if ! perf record -o "${perfdata}" -e "${pebs_events}" ${testprog} 2> /dev/null
+  then
+    echo "Auto counter reload PEBS sampling [Skipped not supported]"
+    echo "Auto counter reload sampling [Success]"
+    return
+  fi
+  if ! perf script -i "${perfdata}" -F event | grep -q "instructions"
+  then
+    echo "Auto counter reload PEBS sampling [Failed missing instructions event]"
+    err=1
+    return
+  fi
+  if perf script -i "${perfdata}" -F event | grep -q "cycles"
+  then
+    echo "Auto counter reload PEBS sampling [Failed cycles event shouldn't be sampled]"
+    err=1
+    return
+  fi
+  echo "Auto counter reload sampling [Success]"
+}
+
 test_ratio_to_prev() {
   echo "ratio-to-prev test"
   if ! perf record -o /dev/null -e "{instructions, cycles/period=100000,ratio-to-prev=0.5/}" \
@@ -457,6 +499,7 @@ test_leader_sampling
 test_topdown_leader_sampling
 test_precise_max
 test_callgraph
+test_acr_sampling
 test_ratio_to_prev
 
 # restore the default value

base-commit: 40db90ac9f66c8246c1746c56d397283d161655c
-- 
2.34.1