From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 42F04429CD2; Fri, 17 Jul 2026 14:21:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784298083; cv=none; b=AiQnDw51W6GftQQ9G0DuDZDH+x3EKASb/Fk3a49oBx7xhC0wqwcCUBPKIJCd+j+bdpTjd6V+5HPuDDc6z+5FN3XTCUTCwrB9Uwl+j/l3dc8RPAf6Ww7wXXDePH1bhV3Yj/KvhtLQDbbsy1GEQp15IRkiZ3xQV1vGa5l2HQfCqOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784298083; c=relaxed/simple; bh=czg/9d+D847aI9xV8AclvcAnNwtePW+A4Kp7ItsErfw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NgqZaoQJT9oMihrMOg4NVP7qdRZg9LKtOtJwF+641AqmlUsx3T9mVqnDM1vYuEgw51l6TCCoiSR+bupqI0A+V4sUruqr/8+ZfMKDyhC9B2QnrLwN8hzE/0Gu/MWPUYX5RtMIiVvn7Xr8o+9bOaJW43ZLuqunh4om+JIW4TeSp6w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LJjEDuTg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LJjEDuTg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1305D1F000E9; Fri, 17 Jul 2026 14:21:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784298081; bh=IXNNT+2caPXqZF2SGll0FRjuXEGwWvzO8xCQh5lGDKU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LJjEDuTgTS8yNZ6Y47UMFTzTABrOsRwF+6wYf0CbHx4gVnoXdfp6oqWoG8FtTY/XX Tnp8lKksykBqW6qyuAvzw8c0bghNtAfe+DaFZdmj76aOpjLCImTN6f/DiMmCO2L9IJ TwmT82U0K//44momW+Sn/XNrh9DMEdkWA1bt8Z9qbcLEHOUeQ7CQ32nCmqh8p5kCwR 2vrpwj9fham58s2bSQDVF9TO3SkrWIVwoZ54pHjMUhWragZzo9U3U+vIZtvUpfhJKX IZ/S8rX9h1TVdNvHXFIzjCEjCoUAubJi3oYgX1GPpDkYCyAfyp493vABr97Bf6jodu xAUk8AyE8Mh5w== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra , Ingo Molnar , x86@kernel.org Cc: Jinchao Wang , Mathieu Desnoyers , Masami Hiramatsu , Thomas Gleixner , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Alexander Shishkin , Ian Rogers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH v9 09/10] selftests: ftrace: Add wprobe trigger testcase Date: Fri, 17 Jul 2026 23:21:15 +0900 Message-ID: <178429807574.157981.9731373698058020773.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178429796992.157981.3393977217853767915.stgit@devnote2> References: <178429796992.157981.3393977217853767915.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) Add a testcase for checking wprobe trigger. This sets set_wprobe and clear_wprobe triggers on fprobe events to watch dentry access. So this depends on both wprobe and fprobe. Signed-off-by: Masami Hiramatsu (Google) --- Changes in v9: - Drop dentry cache after removing tempfile for on-disk filesystem. Changes in v8: - Use TMPDIR for making a test file. - Ensure the fprobe and target functions exists, if not, exit with UNRESOLVED (== skip). Changes in v7: - Add a newline at the end of file.(style fix) - Use dentry_kill instead of __dentry_kill. Changes in v5: - Enable CONFIG_WPROBE_TRIGGERS in the config for ftrace test. Changes in v3: - Newly added. --- tools/testing/selftests/ftrace/config | 1 .../ftrace/test.d/trigger/trigger-wprobe.tc | 70 ++++++++++++++++++++ 2 files changed, 71 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config index d2f503722020..ecdee77f360f 100644 --- a/tools/testing/selftests/ftrace/config +++ b/tools/testing/selftests/ftrace/config @@ -28,3 +28,4 @@ CONFIG_TRACER_SNAPSHOT=y CONFIG_UPROBES=y CONFIG_UPROBE_EVENTS=y CONFIG_WPROBE_EVENTS=y +CONFIG_WPROBE_TRIGGERS=y diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc new file mode 100644 index 000000000000..0634259e2c65 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc @@ -0,0 +1,70 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test wprobe trigger +# requires: dynamic_events "w[:[/][]] [r|w|rw]@[:]":README events/sched/sched_process_fork/trigger + +echo 0 > tracing_on +rm -f $TMPDIR/hoge + +:;: "Add a wprobe event used by trigger" ;: +echo 'w:watch rw@0:8 address=$addr value=+0($addr)' > dynamic_events + +# we will skip this test if fprobe is not supported. +if ! grep -Fq "f[:[/][]] [%return] []" README; then + echo "UNRESOLVED: fprobe is not supported" + exit_unresolved +fi + +# we will skip this test if the target function does not exist. +if ! grep -wq "do_truncate" /proc/kallsyms; then + echo "UNRESOLVED: do_truncate not found" + exit_unresolved +fi +if ! grep -wq "dentry_kill" /proc/kallsyms; then + echo "UNRESOLVED: dentry_kill not found" + exit_unresolved +fi + +:;: "Add events for triggering wprobe" ;: +echo 'f:truncate do_truncate dentry=$arg2' >> dynamic_events +echo 'f:dentry_kill dentry_kill dentry=$arg1' >> dynamic_events + +:;: "Add wprobe triggers" ;: +echo 'set_wprobe:watch:dentry' >> events/fprobes/truncate/trigger +echo 'clear_wprobe:watch:dentry' >> events/fprobes/dentry_kill/trigger +cat events/fprobes/truncate/trigger | grep ^set_wprobe +cat events/fprobes/dentry_kill/trigger | grep ^clear_wprobe + +:;: "Ensure wprobe is still disabled" ;: +cat events/wprobes/watch/enable | grep 0 + +:;: "Enable events for triggers" ;: +echo 1 >> events/fprobes/truncate/enable +echo 1 >> events/fprobes/dentry_kill/enable + +:;: "Start test workload" ;: +echo 1 >> tracing_on + +echo aaa > $TMPDIR/hoge +echo bbb > $TMPDIR/hoge +echo ccc > $TMPDIR/hoge +rm $TMPDIR/hoge + +:;: "Drop dentry caches (for dentry_kill)" ;: +# Use append (>>) to avoid calling do_truncate again. +sync && echo 2 >> /proc/sys/vm/drop_caches + +:;: "Check trace results" ;: +cat trace | grep watch + + +:;: "Ensure wprobe becomes disabled again" ;: +cat events/wprobes/watch/enable | grep 0 + +:;: "Remove wprobe triggers" ;: +echo '!set_wprobe:watch:dentry' >> events/fprobes/truncate/trigger +echo '!clear_wprobe:watch' >> events/fprobes/dentry_kill/trigger +! grep ^set_wprobe events/fprobes/truncate/trigger +! grep ^clear_wprobe events/fprobes/dentry_kill/trigger + +exit 0