From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f53.google.com (mail-pj1-f53.google.com [209.85.216.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 115441A841F; Wed, 11 Dec 2024 22:25:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733955934; cv=none; b=nj8aRQ+1sgTnBe7Pq+F+4xCv2fQUlHlw9GXnDY6G7hY3J0WL+pMLa6QkckerpB5AiKGr2bb3pPT8ZXzq5rUDOB0suQdoc9LXNMNO4GqWs8aUGgXNzjdFReAhQIgUEoCtNBoAxmuJIc0JvqJ4vHUITps2Xc370HCcYM06qR2fvr0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733955934; c=relaxed/simple; bh=WcP8puCu5E/iDC54GFAUuXvtSp716LObvesLuvgYsRI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=h4sd3zgRWyIhocPK1sFghP70rtpRt5QWwemlXqBpmgwb/F6GOmHprO+1x5KQCgXUvBvNGDsiGMAwgtivzcHMfgHfX7CqAabBmuUfJYsdvRFZ7FjYjK0ZIwpZBWZU1jEqufxt2e2+5fsyNI7xsloq4CL8+rcbPJ1olN8n3BTvrBY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=D/xTczJ7; arc=none smtp.client-ip=209.85.216.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="D/xTczJ7" Received: by mail-pj1-f53.google.com with SMTP id 98e67ed59e1d1-2ef28f07dbaso5327025a91.2; Wed, 11 Dec 2024 14:25:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1733955932; x=1734560732; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Xv4FsWqTskXRjULZFj9NoFjvesUrabAkk8N5KhmRpII=; b=D/xTczJ7fDCFcOM3R+M9IGSXvLzYlB0UfX3XCJVpEsPPW4HYkvgyw/nQtgyHGADgIz TLobRUQz+9o7reYSa1ZR3yOMcQJTj0aIuqujWR41g1YRghzufEG009hcy446BiyJ0BXn 3JqGbRmYK7UeJyb0IpGT2wh0p4UNl7WeSX8sJe9dCKV63pjFl/Wgu0QrWs+h5qv/nKZI j/ypMnfV6hPQjcPdAite2iJU6UaJX1Eov/zpM6cBMWVWlduwrPXW5UP1ZdpG28JfHfAY aLlSElcne1PG1Bw6Vhh4Bi3abLStJUVVjgbcoJw55jyXBd4+VjXPto/ZkKm8r5+P0mni ESUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1733955932; x=1734560732; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Xv4FsWqTskXRjULZFj9NoFjvesUrabAkk8N5KhmRpII=; b=mFfldcuf/2kuVkHoqgK1NJ2FAhKQNuV24JrippzdUne0K28JSD4buQYPeKQP4BzgMg 3tJh2jE9ZED72t8jo3sSxBXyqpUfE9Mrm6rVa5qyzgH0W1o8l+F4pfAkpDQje85j+PDy L0kdydKohSG8tn3uQcExXn7ORvD4Bh7vkJjyPMJXwFSCG6GQvOPsgQA1qHa2ddqvgZ7X YC85OIgGL7fzPfAU8KF4SDMaLVXpBKXhiw7bC6VQmuL5HNzdTVScuNh80PxziQ0elwyY kc9FrzuCs25JRFIRMuiX8XyOWZZhVTECsxyL8TmTrMZVJxyX4foRvWdPkMwz7cSXf8vL 5qCQ== X-Forwarded-Encrypted: i=1; AJvYcCUzd4QSWgZNZfw7R11246PKeQcy9z10AhCU4C8mm/r9D1JK5JzLaGQoLJ8x5biDPbfxEEfhxpZ652HjPaI=@vger.kernel.org, AJvYcCWDgkMGgddTEt5YamgmkttH7G1pgJwhYmC4Avlw+HOhrwvSiVCbp/XtNJ8/9cwQk3xeGwmKZY/OgeUIhAUYImvrdQ==@vger.kernel.org X-Gm-Message-State: AOJu0YwXodSuADCl0fm1TtUBJuXfhVyusc05JdtdsjNeAfcx4AssBuwH EYsLkYSZghq7bOQ8X9FgPMLRbufFcJH4fJLgChwIZ9NurmoR916+ X-Gm-Gg: ASbGncuMOSVUrrAtlcJKpn9TKec3O3mWyQr/64MsBtgp4pob4mJBIOu1jy/BRxYeQc8 aCGTmYCQzWw1NJxp6SdM9LbIUxqIQAJmBnuuTQzFXOEoAjGpZehhb1yTbTCY5HKepxFFpRPT9cv Bp0D9s2PG+oIKd1L0DaZmKCGlvfAEW7+IO7YBGr2CmDkGyFSNPoWJzLqYcPRM7cXlBHhtgkLNnZ rZlQOEZzDJT2Ifeug8BCxSIlQeIbnjU8VjjRRl9cD6/l02YKV/ZQXSL7uupS5sDVz/iY0oeOY5i K6dGmTqo8Q== X-Google-Smtp-Source: AGHT+IHkhgo64hBSIkDb8tXLO6YdgvzziWD/2PaaeEPKCrpx17NbdL7MwkxUqm4GBvBNMmGKYS4h7g== X-Received: by 2002:a17:90b:1e50:b0:2ee:af31:a7bd with SMTP id 98e67ed59e1d1-2f127f565eemr7208460a91.5.1733955932177; Wed, 11 Dec 2024 14:25:32 -0800 (PST) Received: from mbp.lan (c-73-202-46-50.hsd1.ca.comcast.net. [73.202.46.50]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2ef6d1fd68asm11241561a91.36.2024.12.11.14.25.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Dec 2024 14:25:31 -0800 (PST) From: Howard Chu To: acme@kernel.org Cc: namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Howard Chu Subject: [PATCH v11 00/10] perf record --off-cpu: Dump off-cpu samples directly Date: Wed, 11 Dec 2024 14:25:18 -0800 Message-ID: <20241211222528.945590-1-howardchu95@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Changes in v11: - Modify the options used in the off-cpu tests, as I changed the unit of the off-cpu threshold to milliseconds. Changes in v10: - Move the commit "perf record --off-cpu: Add --off-cpu-thresh option" to where the direct sample feature is completed. - Make --off-cpu-thresh use milliseconds as the unit. Changes in v9: - Add documentation for the new option '--off-cpu-thresh', and include an example of its usage in the commit message - Set inherit in evsel__config() to prevent future modifications - Support off-cpu sample data collected by perf before this patch series Changes in v8: - Make this series bisectable - Rename off_cpu_thresh to off_cpu_thresh_us and offcpu_thresh (in BPF) to offcpu_thresh_ns for clarity - Add commit messages to 'perf evsel: Expose evsel__is_offcpu_event() for future use' commit - Correct spelling mistakes in the commit message (s/is should be/should be/) - Add kernel-doc comments to off_cpu_dump(), and comments to the empty if block - Add some comments to off-cpu test - Delete an unused variable 'timestamp' in off_cpu_dump() Changes in v7: - Make off-cpu event system-wide - Use strtoull instead of strtoul - Delete unused variable such as sample_id, and sample_type - Use i as index to update BPF perf_event map - MAX_OFFCPU_LEN 128 is too big, make it smaller. - Delete some bound check as it's always guaranteed - Do not set ip_pos in BPF - Add a new field for storing stack traces in the tstamp map - Dump the off-cpu sample directly or save it in the off_cpu map, not both - Delete the sample_type_off_cpu check - Use __set_off_cpu_sample() to parse samples instead of a two-pass parsing Changes in v6: - Make patches bisectable Changes in v5: - Delete unnecessary copy in BPF program - Remove sample_embed from perf header, hard code off-cpu stuff instead - Move evsel__is_offcpu_event() to evsel.h - Minor changes to the test - Edit some comments Changes in v4: - Minimize the size of data output by perf_event_output() - Keep only one off-cpu event - Change off-cpu threshold's unit to microseconds - Set a default off-cpu threshold - Print the correct error message for the field 'embed' in perf data header Changes in v3: - Add off-cpu-thresh argument - Process direct off-cpu samples in post Changes in v2: - Remove unnecessary comments. - Rename function off_cpu_change_type to off_cpu_prepare_parse v1: As mentioned in: https://bugzilla.kernel.org/show_bug.cgi?id=207323 Currently, off-cpu samples are dumped when perf record is exiting. This results in off-cpu samples being after the regular samples. This patch series makes possible dumping off-cpu samples on-the-fly, directly into perf ring buffer. And it dispatches those samples to the correct format for perf.data consumers. Before: ``` migration/0 21 [000] 27981.041319: 2944637851 cycles:P: ffffffff90d2e8aa record_times+0xa ([kernel.kallsyms]) perf 770116 [001] 27981.041375: 1 cycles:P: ffffffff90ee4960 event_function+0xf0 ([kernel.kallsyms]) perf 770116 [001] 27981.041377: 1 cycles:P: ffffffff90c184b1 intel_bts_enable_local+0x31 ([kernel.kallsyms]) perf 770116 [001] 27981.041379: 51611 cycles:P: ffffffff91a160b0 native_sched_clock+0x30 ([kernel.kallsyms]) migration/1 26 [001] 27981.041400: 4227682775 cycles:P: ffffffff90d06a74 wakeup_preempt+0x44 ([kernel.kallsyms]) migration/2 32 [002] 27981.041477: 4159401534 cycles:P: ffffffff90d11993 update_load_avg+0x63 ([kernel.kallsyms]) sshd 708098 [000] 18446744069.414584: 286392 offcpu-time: 79a864f1c8bb ppoll+0x4b (/usr/lib/libc.so.6) 585690935cca [unknown] (/usr/bin/sshd) ``` After: ``` perf 774767 [003] 28178.033444: 497 cycles:P: ffffffff91a160c3 native_sched_clock+0x43 ([kernel.kallsyms]) perf 774767 [003] 28178.033445: 399440 cycles:P: ffffffff91c01f8d nmi_restore+0x25 ([kernel.kallsyms]) swapper 0 [001] 28178.036639: 376650973 cycles:P: ffffffff91a1ae99 intel_idle+0x59 ([kernel.kallsyms]) swapper 0 [003] 28178.182921: 348779378 cycles:P: ffffffff91a1ae99 intel_idle+0x59 ([kernel.kallsyms]) blueman-tray 1355 [000] 28178.627906: 100184571 offcpu-time: 7528eef1c39d __poll+0x4d (/usr/lib/libc.so.6) 7528edf7d8fd [unknown] (/usr/lib/libglib-2.0.so.0.8000.2) 7528edf1af95 g_main_context_iteration+0x35 (/usr/lib/libglib-2.0.so.0.8000.2) 7528eda4ab86 g_application_run+0x1f6 (/usr/lib/libgio-2.0.so.0.8000.2) 7528ee6aa596 [unknown] (/usr/lib/libffi.so.8.1.4) 7fff24e862d8 [unknown] ([unknown]) blueman-tray 1355 [000] 28178.728137: 100187539 offcpu-time: 7528eef1c39d __poll+0x4d (/usr/lib/libc.so.6) 7528edf7d8fd [unknown] (/usr/lib/libglib-2.0.so.0.8000.2) 7528edf1af95 g_main_context_iteration+0x35 (/usr/lib/libglib-2.0.so.0.8000.2) 7528eda4ab86 g_application_run+0x1f6 (/usr/lib/libgio-2.0.so.0.8000.2) 7528ee6aa596 [unknown] (/usr/lib/libffi.so.8.1.4) 7fff24e862d8 [unknown] ([unknown]) swapper 0 [000] 28178.463253: 195945410 cycles:P: ffffffff91a1ae99 intel_idle+0x59 ([kernel.kallsyms]) dbus-broker 412 [002] 28178.464855: 376737008 cycles:P: ffffffff91c000a0 entry_SYSCALL_64+0x20 ([kernel.kallsyms]) ``` Howard Chu (10): perf evsel: Expose evsel__is_offcpu_event() for future use perf record --off-cpu: Parse off-cpu event perf record --off-cpu: Preparation of off-cpu BPF program perf record --off-cpu: Dump off-cpu samples in BPF perf evsel: Assemble offcpu samples perf record --off-cpu: Disable perf_event's callchain collection perf script: Display off-cpu samples correctly perf record --off-cpu: Dump the remaining samples in BPF's stack trace map perf record --off-cpu: Add --off-cpu-thresh option perf test: Add direct off-cpu test tools/perf/Documentation/perf-record.txt | 9 ++ tools/perf/builtin-record.c | 26 +++++ tools/perf/builtin-script.c | 4 +- tools/perf/tests/builtin-test.c | 1 + tools/perf/tests/shell/record_offcpu.sh | 35 ++++++- tools/perf/tests/tests.h | 1 + tools/perf/tests/workloads/Build | 1 + tools/perf/tests/workloads/offcpu.c | 16 ++++ tools/perf/util/bpf_off_cpu.c | 117 ++++++++++++++--------- tools/perf/util/bpf_skel/off_cpu.bpf.c | 97 ++++++++++++++++++- tools/perf/util/evsel.c | 41 +++++++- tools/perf/util/evsel.h | 2 + tools/perf/util/off_cpu.h | 3 +- tools/perf/util/record.h | 1 + 14 files changed, 296 insertions(+), 58 deletions(-) create mode 100644 tools/perf/tests/workloads/offcpu.c -- 2.43.0