linux-kernel - [PATCH 1/2] perf test shell: Replace '|&' with '2>&1 |' to work with more shells

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Date:   Tue, 19 Jun 2018 18:49:48 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Richter <tmricht@...ux.vnet.ibm.com>,
        Michael Petlan <mpetlan@...hat.com>,
        =?ISO-8859-1?Q? "Hendrik_Br=FCckner" ?= 
        <brueckner@...ux.vnet.ibm.com>,
        Sandipan Das <sandipan@...ux.vnet.ibm.com>
Subject: [PATCH 1/2] perf test shell: Replace '|&' with '2>&1 |' to work
 with more shells

Since we do not specify bash (and/or zsh) as a requirement, use the
standard error redirection that is more widely supported.

BEFORE:

$ sudo ./perf test -v 62
62: Check open filename arg using perf trace + vfs_getname:
--- start ---
test child forked, pid 27305
./tests/shell/trace+probe_vfs_getname.sh: 20: ./tests/shell/trace+probe_vfs_getname.sh: Syntax error: "&" unexpected
test child finished with -2
---- end ----
Check open filename arg using perf trace + vfs_getname: Skip

AFTER:

$ sudo ./perf test -v 64
64: Check open filename arg using perf trace + vfs_getname               :
--- start ---
test child forked, pid 23008
Added new event:
  probe:vfs_getname    (on getname_flags:72 with pathname=result->name:string)

You can now use it in all perf tools, such as:

        perf record -e probe:vfs_getname -aR sleep 1

     0.361 ( 0.008 ms): touch/23032 openat(dfd: CWD, filename: /tmp/temporary_file.VEh0n, flags: CREAT|NOCTTY|NONBLOCK|WRONLY, mode: IRUGO|IWUGO) = 4
test child finished with 0
---- end ----
Check open filename arg using perf trace + vfs_getname: Ok

Similar to commit 35435cd06081, with the same title.

Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Signed-off-by: Kim Phillips <kim.phillips@....com>
---
 tools/perf/tests/shell/trace+probe_vfs_getname.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/trace+probe_vfs_getname.sh b/tools/perf/tests/shell/trace+probe_vfs_getname.sh
index 55ad9793d544..4ce276efe6b4 100755
--- a/tools/perf/tests/shell/trace+probe_vfs_getname.sh
+++ b/tools/perf/tests/shell/trace+probe_vfs_getname.sh
@@ -17,7 +17,7 @@ skip_if_no_perf_probe || exit 2
 file=$(mktemp /tmp/temporary_file.XXXXX)
 
 trace_open_vfs_getname() {
-	evts=$(echo $(perf list syscalls:sys_enter_open* |& egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
+	evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
 	perf trace -e $evts touch $file 2>&1 | \
 	egrep " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch\/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +${file}, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
 }
-- 
2.17.1