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 D758A4F0537; Mon, 28 Sep 2026 17:12:49 +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=1790615571; cv=none; b=bReLvS29Py+sNyTRiEzyufIwJyq23YARAGOdAeZzmkrulO0GNhdjbE2b87B3v1JZpvNkf9kFBEBypI74Fi8v4WVHOSPFGzLEGUSjuxdWf5DQd777yNitemuF2iV96Gf07ZRqrhX3NM4mO6PHreGUsk3d6UknrsJIXPe/gva9nbo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790615571; c=relaxed/simple; bh=DszjBhIvPBrLUaoRZqVa2YNnNfG9LUxLWZ71SacIXOs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=cOhSgltz7HOaaZX1p3mYCIzJmK+hJrhAG25Aej3MBxgbxrrymRFD4bT6DmLA5VMT1LXwUJRB1a+S1EM0vdTbQ+JzcX/LJbtOwmNX7xFsoFU6Yhh0tcStfcs7Rbe3owY468ZDjY95qyH3L6YpqdFxSjXe/NyfZTnex7zBWw0Bzso= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CWC4/mzW; 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="CWC4/mzW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2426B1F000FF; Mon, 28 Sep 2026 17:12:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790615569; bh=98vMqiHnCqnxVm88CFrbF0T6hUCxlg8mp7GTURFeIQM=; h=From:To:Cc:Subject:Date; b=CWC4/mzWJOhuQKxiK3/y1HKWRlHSInpwb7dagdAJE0M9HQaOLBt/Zgz3s6m+a0x6s cUM24v0/uvQzMkC20gXEzEKmmTkEi1DfJTTDPp27Wa2TOomkCGcsAJUniWzuVOXtSl H1I942k+0/yPnG/Vd1LuJZJzpX+fsSPtcdRnbmfPw8JKY3g1QroDKLVn3JohhWYBUP yrtQtwpSqS1DXJ3mK/nJRSf43QssevT8LMLm7CSq8N2jVU97zmb2iAGUvJ7M74BBH2 MZG1SloWzMjaMVrEVxvozNDvUBULPFbDBh1bJnOgtIDn4DwWMuelLOzBp+grwq3O+R JB3dKUr5WXsRA== From: Arnaldo Carvalho de Melo To: Namhyung Kim Cc: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , Ian Rogers , Adrian Hunter , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo Subject: [PATCH v2 0/4] perf tools: Add progress diagnostics and a false-sharing workload Date: Mon, 28 Sep 2026 19:12:40 +0200 Message-ID: <20260928171244.2437283-1-acme@kernel.org> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, This series adds progress and stuck-process diagnostics to perf, and a workload that makes false sharing visible to data type profiling. The changes are: - move perf_config__set_variable() to util/config.c and serialize config parser and read-modify-write state, so non-builtin perf code can persist configuration changes safely; - add 'perf report --progress' for stdio users, showing the current phase, percentage, and counts while a session is processed; - add the prototype tools/perf/scripts/perf-stuck.sh helper, which samples a running perf process and can invoke the accompanying GDB commands when progress stops; - add 'perf test -w false_sharing', a synthetic TCP-shaped workload with identity and packet counters sharing a cacheline, and include it in the data type profiling shell test. The progress backend handles nested phases and completes them on error paths as well as successful paths. The false-sharing workload uses a shared volatile instance so the data type profiler can resolve direct accesses to the individual members. The perf-stuck helper is intentionally a prototype and requires the usual /proc access; its optional GDB mode additionally requires gdb and suitable debug information. When only one CPU is available, the false-sharing workload warns that it cannot produce cross-CPU traffic but still runs. Best regards, - Arnaldo What changed from v1: - avoid calling CPU_SET() with -1 when false_sharing runs with only one CPU available in its affinity mask. Reported by Sashiko on v1. tools/perf/Documentation/perf-report.txt | 13 ++ tools/perf/builtin-config.c | 70 +------- tools/perf/builtin-report.c | 10 ++ tools/perf/scripts/perf-stuck.gdb | 106 ++++++++++++ tools/perf/scripts/perf-stuck.sh | 181 ++++++++++++++++++++ tools/perf/tests/builtin-test.c | 1 + tools/perf/tests/shell/data_type_profiling.sh | 9 +- tools/perf/tests/tests.h | 1 + tools/perf/tests/workloads/Build | 2 + tools/perf/tests/workloads/false_sharing.c | 240 ++++++++++++++++++++++++++ tools/perf/ui/Build | 1 + tools/perf/ui/progress.h | 2 + tools/perf/ui/stdio/progress.c | 162 ++++++++++++++++++ tools/perf/util/config.c | 124 +++++++++++++- tools/perf/util/config.h | 2 + tools/perf/util/ordered-events.c | 16 +- tools/perf/util/session.c | 12 +- 17 files changed, 869 insertions(+), 83 deletions(-) base-commit: 0ae6fc78c5ce0dfd v1-head: 45d7917f7e05e8a29828ed5f0bbdc94fc938f79f -- Assisted-by: OpenCode: GPT-5.6 Luna