linux-kernel - [PATCH v1 4/4] perf record: Dump off-cpu samples directly

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Date: Mon, 22 Apr 2024 16:09:29 +0800
From: Howard Chu <howardchu95@...il.com>
To: peterz@...radead.org
Cc: mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	kan.liang@...ux.intel.com,
	yangjihong1@...wei.com,
	zegao2021@...il.com,
	leo.yan@...ux.dev,
	ravi.bangoria@....com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	Howard Chu <howardchu95@...il.com>
Subject: [PATCH v1 4/4] perf record: Dump off-cpu samples directly

Since `--off-cpu` uses the same ring buffer as hardware samples, and `perf
record --off-cpu -e dummy sleep 1` does not enable evlist, off-cpu samples
cannot be read.`test_offcpu_basic` fails and is no longer necessary.

Signed-off-by: Howard Chu <howardchu95@...il.com>
---
 tools/perf/tests/shell/record_offcpu.sh | 29 -------------------------
 1 file changed, 29 deletions(-)

diff --git a/tools/perf/tests/shell/record_offcpu.sh b/tools/perf/tests/shell/record_offcpu.sh
index 67c925f3a15a..c446c0cdee4f 100755
--- a/tools/perf/tests/shell/record_offcpu.sh
+++ b/tools/perf/tests/shell/record_offcpu.sh
@@ -36,30 +36,6 @@ test_offcpu_priv() {
   fi
 }
 
-test_offcpu_basic() {
-  echo "Basic off-cpu test"
-
-  if ! perf record --off-cpu -e dummy -o ${perfdata} sleep 1 2> /dev/null
-  then
-    echo "Basic off-cpu test [Failed record]"
-    err=1
-    return
-  fi
-  if ! perf evlist -i ${perfdata} | grep -q "offcpu-time"
-  then
-    echo "Basic off-cpu test [Failed no event]"
-    err=1
-    return
-  fi
-  if ! perf report -i ${perfdata} -q --percent-limit=90 | grep -E -q sleep
-  then
-    echo "Basic off-cpu test [Failed missing output]"
-    err=1
-    return
-  fi
-  echo "Basic off-cpu test [Success]"
-}
-
 test_offcpu_child() {
   echo "Child task off-cpu test"
 
@@ -88,13 +64,8 @@ test_offcpu_child() {
   echo "Child task off-cpu test [Success]"
 }
 
-
 test_offcpu_priv
 
-if [ $err = 0 ]; then
-  test_offcpu_basic
-fi
-
 if [ $err = 0 ]; then
   test_offcpu_child
 fi
-- 
2.44.0