[PATCH v1] perf test annotate: Use --percent-limit rather than head to reduce output

[PATCH v1] perf test annotate: Use --percent-limit rather than head to reduce output

[Ian Rogers]

The annotate test was sped up by Thomas Richter
<tmricht@linux.ibm.com> in commit
658a8805cb60 ("perf test: Speed up test case 70 annotate basic tests")
by reducing the annotate output using head. This causes flakes on
hybrid machines where the first event dumped may not have the samples
for the test within it. Rather than reduce the output using `head`
switch to `--percent-limit 10` which will stop annotate dumping
functions that have an overhead of less than 10%, the noploop program
should be using more.

Add the missing objdump option for the pipe mode version of the
objdump with a command test.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/shell/annotate.sh | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/tools/perf/tests/shell/annotate.sh b/tools/perf/tests/shell/annotate.sh
index 16a1ccd06089..689de58e9238 100755
--- a/tools/perf/tests/shell/annotate.sh
+++ b/tools/perf/tests/shell/annotate.sh
@@ -53,21 +53,22 @@ test_basic() {
   # Generate the annotated output file
   if [ "x${mode}" == "xBasic" ]
   then
-    perf annotate --no-demangle -i "${perfdata}" --stdio 2> /dev/null > "${perfout}"
+    perf annotate --no-demangle -i "${perfdata}" --stdio --percent-limit 10 2> /dev/null > "${perfout}"
   else
-    perf annotate --no-demangle -i - --stdio 2> /dev/null < "${perfdata}" > "${perfout}"
+    perf annotate --no-demangle -i - --stdio 2> /dev/null --percent-limit 10 < "${perfdata}" > "${perfout}"
   fi
 
   # check if it has the target symbol
-  if ! head -250 "${perfout}" | grep -q "${testsym}"
+  if ! grep -q "${testsym}" "${perfout}"
   then
     echo "${mode} annotate [Failed: missing target symbol]"
+    cat "${perfout}"
     err=1
     return
   fi
 
   # check if it has the disassembly lines
-  if ! head -250 "${perfout}" | grep -q "${disasm_regex}"
+  if ! grep -q "${disasm_regex}" "${perfout}"
   then
     echo "${mode} annotate [Failed: missing disasm output from default disassembler]"
     err=1
@@ -92,11 +93,11 @@ test_basic() {
   # check one more with external objdump tool (forced by --objdump option)
   if [ "x${mode}" == "xBasic" ]
   then
-    perf annotate --no-demangle -i "${perfdata}" --objdump=objdump 2> /dev/null > "${perfout}"
+    perf annotate --no-demangle -i "${perfdata}" --percent-limit 10 --objdump=objdump 2> /dev/null > "${perfout}"
   else
-    perf annotate --no-demangle -i - "${testsym}" 2> /dev/null < "${perfdata}" > "${perfout}"
+    perf annotate --no-demangle -i - "${testsym}" --percent-limit 10 --objdump=objdump 2> /dev/null < "${perfdata}" > "${perfout}"
   fi
-  if ! head -250 "${perfout}" | grep -q -m 3 "${disasm_regex}"
+  if ! grep -q -m 3 "${disasm_regex}" "${perfout}"
   then
     echo "${mode} annotate [Failed: missing disasm output from non default disassembler (using --objdump)]"
     err=1
-- 
2.50.0.727.gbf7dc18ff4-goog

Re: [PATCH v1] perf test annotate: Use --percent-limit rather than head to reduce output

[Thomas Richter]

On 6/28/25 03:58, Ian Rogers wrote:
> The annotate test was sped up by Thomas Richter
> <tmricht@linux.ibm.com> in commit
> 658a8805cb60 ("perf test: Speed up test case 70 annotate basic tests")
> by reducing the annotate output using head. This causes flakes on
> hybrid machines where the first event dumped may not have the samples
> for the test within it. Rather than reduce the output using `head`
> switch to `--percent-limit 10` which will stop annotate dumping
> functions that have an overhead of less than 10%, the noploop program
> should be using more.
> 
> Add the missing objdump option for the pipe mode version of the
> objdump with a command test.
> 
> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
>  tools/perf/tests/shell/annotate.sh | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/tests/shell/annotate.sh b/tools/perf/tests/shell/annotate.sh
> index 16a1ccd06089..689de58e9238 100755
> --- a/tools/perf/tests/shell/annotate.sh
> +++ b/tools/perf/tests/shell/annotate.sh
> @@ -53,21 +53,22 @@ test_basic() {
>    # Generate the annotated output file
>    if [ "x${mode}" == "xBasic" ]
>    then
> -    perf annotate --no-demangle -i "${perfdata}" --stdio 2> /dev/null > "${perfout}"
> +    perf annotate --no-demangle -i "${perfdata}" --stdio --percent-limit 10 2> /dev/null > "${perfout}"
>    else
> -    perf annotate --no-demangle -i - --stdio 2> /dev/null < "${perfdata}" > "${perfout}"
> +    perf annotate --no-demangle -i - --stdio 2> /dev/null --percent-limit 10 < "${perfdata}" > "${perfout}"
>    fi
>  
>    # check if it has the target symbol
> -  if ! head -250 "${perfout}" | grep -q "${testsym}"
> +  if ! grep -q "${testsym}" "${perfout}"
>    then
>      echo "${mode} annotate [Failed: missing target symbol]"
> +    cat "${perfout}"
>      err=1
>      return
>    fi
>  
>    # check if it has the disassembly lines
> -  if ! head -250 "${perfout}" | grep -q "${disasm_regex}"
> +  if ! grep -q "${disasm_regex}" "${perfout}"
>    then
>      echo "${mode} annotate [Failed: missing disasm output from default disassembler]"
>      err=1
> @@ -92,11 +93,11 @@ test_basic() {
>    # check one more with external objdump tool (forced by --objdump option)
>    if [ "x${mode}" == "xBasic" ]
>    then
> -    perf annotate --no-demangle -i "${perfdata}" --objdump=objdump 2> /dev/null > "${perfout}"
> +    perf annotate --no-demangle -i "${perfdata}" --percent-limit 10 --objdump=objdump 2> /dev/null > "${perfout}"
>    else
> -    perf annotate --no-demangle -i - "${testsym}" 2> /dev/null < "${perfdata}" > "${perfout}"
> +    perf annotate --no-demangle -i - "${testsym}" --percent-limit 10 --objdump=objdump 2> /dev/null < "${perfdata}" > "${perfout}"
>    fi
> -  if ! head -250 "${perfout}" | grep -q -m 3 "${disasm_regex}"
> +  if ! grep -q -m 3 "${disasm_regex}" "${perfout}"
>    then
>      echo "${mode} annotate [Failed: missing disasm output from non default disassembler (using --objdump)]"
>      err=1
Works ok on s390

Tested-by: Thomas Richter <tmricht@linux.ibm.com>

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
IBM Deutschland Research & Development GmbH

Vorsitzender des Aufsichtsrats: Wolfgang Wendt

Geschäftsführung: David Faller

Sitz der Gesellschaft: Böblingen / Registergericht: Amtsgericht Stuttgart, HRB 243294

Re: [PATCH v1] perf test annotate: Use --percent-limit rather than head to reduce output

[Namhyung Kim]

On Fri, 27 Jun 2025 18:58:32 -0700, Ian Rogers wrote:
> The annotate test was sped up by Thomas Richter
> <tmricht@linux.ibm.com> in commit
> 658a8805cb60 ("perf test: Speed up test case 70 annotate basic tests")
> by reducing the annotate output using head. This causes flakes on
> hybrid machines where the first event dumped may not have the samples
> for the test within it. Rather than reduce the output using `head`
> switch to `--percent-limit 10` which will stop annotate dumping
> functions that have an overhead of less than 10%, the noploop program
> should be using more.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung