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 2ECAE3203B6; Sun, 2 Aug 2026 08:20:12 +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=1785658815; cv=none; b=RJJTNdL8/p/wut7SI8LFdgw7ZzUZHuer2ompzrAEOZ2Tc9Q+LHu4ETID3rn5Bmr8CTqDH/hWvK2wpIpjwZ0jFUE3JkXI00Hc1NHEy0jrJmerQf46AnkikczvVTCkd05xLJ4h1kntcjlXPLu+2rIhKlv4B33hUYZcPVXqqEqP2rg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785658815; c=relaxed/simple; bh=ViOVyO8yDqguHkU+X02XP0Bs/msFq4/hK8uTCxWGmGY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=OOQzQ/lxx1+4FjeDnYQnKeFC1SPh8wguwAsxeww0El6Hzsr5UNBk16yyF5UVgpSBPXJVoc3nObyqiiRE7KbkgP/9Iq60WqMMRt79/jRMFVpAvDhbDnIxdK8/S/OrcrMsX4WtGkiV4NYlq7MEj2G2LcliDF6VCBDi94G/1f5MJTA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fb2cAbBl; 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="fb2cAbBl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F4B91F00AC4; Sun, 2 Aug 2026 08:20:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785658812; bh=JJ9Ut0yjyuZ90u+R8cbjLYmw1iskToab/1RjRS9W24Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fb2cAbBlXiRqIJed4RgHx2UlOh9J7Mp9TspFsomOUka0fCEQ9iJ8jJGFPFbHlfgND bYaMI5lnGDykAM9ZzQIBcYsRFHIbBDlm+V+a2kFvmvaw8cwueQ7LLG39ufO+fxy7Vm rrgiiJtzdxRDucwcNUer514YVs4889wpe/KbfID/z2nxfhRn7ZdAusbjLV3+hKXzEt VooMpndTQlLFDrmHr4W8me4PxWRK/0BAsMRdFRv9Rfg4gOKwQX55+8x77aLDJL4Heu 4jhj6MSt25OskhBk653SUWeefUZ0b+ZqUkAOuOch4VThMZpMf4FcOfgRMw1kAO/0pq pLvdgtd8B4d1g== 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 v11 09/11] selftests: ftrace: Add wprobe trigger testcase Date: Sun, 2 Aug 2026 17:20:07 +0900 Message-ID: <178565880692.714490.8439336315058403320.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178565870538.714490.11309825813968306287.stgit@devnote2> References: <178565870538.714490.11309825813968306287.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-doc@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 event and static trace event to monitor memory accesses within the trace-events-sample kernel module. Signed-off-by: Masami Hiramatsu (Google) --- Changes in v11: - Update testcase to use trace-events-sample kernel module instead of VFS file operations. --- tools/testing/selftests/ftrace/config | 1 .../ftrace/test.d/trigger/trigger-wprobe.tc | 85 ++++++++++++++++++++ 2 files changed, 86 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..4071fe0c878b --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc @@ -0,0 +1,85 @@ +#!/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 + +rmmod trace-events-sample ||: +if ! modprobe trace-events-sample ; then + echo "No trace-events sample module - please make CONFIG_SAMPLE_TRACE_EVENTS=m" + exit_unresolved +fi + +cleanup_wprobe_triggers() { + if [ -f events/fprobes/testevent/trigger ]; then + reset_trigger_file events/fprobes/testevent/trigger || true + fi + if [ -f events/sample-trace/foo_bar_with_fn/trigger ]; then + reset_trigger_file events/sample-trace/foo_bar_with_fn/trigger || true + fi + echo 0 > events/enable 2>/dev/null || true + echo > dynamic_events 2>/dev/null || true + sleep 1 + rmmod trace-events-sample 2>/dev/null || true + return 0 +} + +trap cleanup_wprobe_triggers EXIT + +echo 0 > tracing_on + +# 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 "sample_timer_cb" /proc/kallsyms; then + echo "UNRESOLVED: sample_timer_cb not found" + exit_unresolved +fi + +:;: "Add a wprobe event used by trigger" ;: +echo 'w:watch rw@0:8 address=$addr value=$value' > dynamic_events + +:;: "Add events for triggering wprobe" ;: +echo 'f:fprobes/testevent sample_timer_cb timer=t' >> dynamic_events + +:;: "Enable all events before setting triggers" ;: +echo 1 > tracing_on +echo 1 >> events/fprobes/testevent/enable +echo 1 >> events/sample-trace/foo_bar_with_fn/enable + +:;: "Set set_wprobe trigger on testevent" ;: +echo 'set_wprobe:watch:timer' >> events/fprobes/testevent/trigger +cat events/fprobes/testevent/trigger | grep ^set_wprobe + +# Wait for sample_timer_cb to fire and set_wprobe trigger to activate +sleep 2 + +:;: "Check set_wprobe trigger activated the watchpoint" ;: +cat trace | grep watch + +:;: "Set clear_wprobe trigger on foo_bar_with_fn" ;: +echo 'clear_wprobe:watch' >> events/sample-trace/foo_bar_with_fn/trigger +cat events/sample-trace/foo_bar_with_fn/trigger | grep ^clear_wprobe + +# Clear trace and wait to ensure no new watchpoint events are generated +clear_trace +sleep 1 + +:;: "Ensure clear_wprobe trigger deactivated the watchpoint" ;: +! grep -q watch trace + +:;: "Remove wprobe triggers" ;: +echo '!set_wprobe:watch:timer' >> events/fprobes/testevent/trigger +echo '!clear_wprobe:watch' >> events/sample-trace/foo_bar_with_fn/trigger +! grep ^set_wprobe events/fprobes/testevent/trigger +! grep ^clear_wprobe events/sample-trace/foo_bar_with_fn/trigger + +:;: "Disable events and remove dynamic events" ;: +echo 0 > events/enable +echo > dynamic_events +clear_trace + +exit 0