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To get the expected output we have to ignore whatever changes the user has in its ~/.perfconfig file, so set PERF_CONFIG to /dev/null to achieve that. Before: # egrep 'trace|show_' ~/.perfconfig [trace] show_zeros = yes show_duration = no show_timestamp = no show_arg_names = no show_prefix = yes # echo $PERF_CONFIG # perf test "trace + vfs_getname" 70: Check open filename arg using perf trace + vfs_getname: FAILED! # export PERF_CONFIG=/dev/null # perf test "trace + vfs_getname" 70: Check open filename arg using perf trace + vfs_getname: Ok # After: # egrep 'trace|show_' ~/.perfconfig [trace] show_zeros = yes show_duration = no show_timestamp = no show_arg_names = no show_prefix = yes # echo $PERF_CONFIG # perf test "trace + vfs_getname" 70: Check open filename arg using perf trace + vfs_getname: Ok # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Taeung Song <treeze.taeung@gmail.com> Link: https://lkml.kernel.org/n/tip-3up27pexg5i3exuzqrvt4m8u@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
44 lines
1.4 KiB
Bash
Executable File
44 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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# Check open filename arg using perf trace + vfs_getname
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# Uses the 'perf test shell' library to add probe:vfs_getname to the system
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# then use it with 'perf trace' using 'touch' to write to a temp file, then
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# checks that that was captured by the vfs_getname was used by 'perf trace',
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# that already handles "probe:vfs_getname" if present, and used in the
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# "open" syscall "filename" argument beautifier.
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# SPDX-License-Identifier: GPL-2.0
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# Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
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. $(dirname $0)/lib/probe.sh
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skip_if_no_perf_probe || exit 2
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skip_if_no_perf_trace || exit 2
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. $(dirname $0)/lib/probe_vfs_getname.sh
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file=$(mktemp /tmp/temporary_file.XXXXX)
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trace_open_vfs_getname() {
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evts=$(echo $(perf list syscalls:sys_enter_open* 2>&1 | egrep 'open(at)? ' | sed -r 's/.*sys_enter_([a-z]+) +\[.*$/\1/') | sed 's/ /,/')
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perf trace -e $evts touch $file 2>&1 | \
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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]+$"
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}
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add_probe_vfs_getname || skip_if_no_debuginfo
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err=$?
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if [ $err -ne 0 ] ; then
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exit $err
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fi
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# Do not use whatever ~/.perfconfig file, it may change the output
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# via trace.{show_timestamp,show_prefix,etc}
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export PERF_CONFIG=/dev/null
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trace_open_vfs_getname
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err=$?
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rm -f ${file}
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cleanup_probe_vfs_getname
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exit $err
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