linux-kernel - Re: [PATCH v3 2/2] selftests/ftrace: Add new test case which checks for optimized probes

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Date:   Sun, 30 Apr 2023 10:52:31 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Akanksha J N <akanksha@...ux.ibm.com>
Cc:     linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
        rostedt@...dmis.org, mhiramat@...nel.org, shuah@...nel.org,
        naveen.n.rao@...ux.ibm.com
Subject: Re: [PATCH v3 2/2] selftests/ftrace: Add new test case which checks
 for optimized probes

On Fri, 28 Apr 2023 22:08:42 +0530
Akanksha J N <akanksha@...ux.ibm.com> wrote:

> Add new test case kprobe_opt_types.tc which enables and checks
> if each probe has been optimized in order to test potential issues with
> optimized probes.
> The '|| continue' is added with the echo statement to ignore errors that
> are caused by trying to add kprobes to non probeable lines and continue
> with the test.
> 
> Signed-off-by: Akanksha J N <akanksha@...ux.ibm.com>

Thanks! This looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

> ---
>  .../ftrace/test.d/kprobe/kprobe_opt_types.tc  | 34 +++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc
> new file mode 100644
> index 000000000000..9f5d99328086
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_opt_types.tc
> @@ -0,0 +1,34 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (C) 2023 Akanksha J N, IBM corporation
> +# description: Register/unregister optimized probe
> +# requires: kprobe_events
> +
> +case `uname -m` in
> +x86_64)
> +;;
> +arm*)
> +;;
> +ppc*)
> +;;
> +*)
> +  echo "Please implement other architecture here"
> +  exit_unsupported
> +esac
> +
> +DEFAULT=$(cat /proc/sys/debug/kprobes-optimization)
> +echo 1 > /proc/sys/debug/kprobes-optimization
> +for i in `seq 0 255`; do
> +        echo  "p:testprobe $FUNCTION_FORK+${i}" > kprobe_events || continue
> +        echo 1 > events/kprobes/enable || continue
> +        (echo "forked")
> +	PROBE=$(grep $FUNCTION_FORK /sys/kernel/debug/kprobes/list)
> +        echo 0 > events/kprobes/enable
> +        echo > kprobe_events
> +	if echo $PROBE | grep -q OPTIMIZED; then
> +                echo "$DEFAULT" >  /proc/sys/debug/kprobes-optimization
> +                exit_pass
> +        fi
> +done
> +echo "$DEFAULT" >  /proc/sys/debug/kprobes-optimization
> +exit_unresolved
> -- 
> 2.31.1
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>