From nobody Tue Dec 2 02:05:47 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 70C342475D0; Thu, 20 Nov 2025 23:48:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763682489; cv=none; b=JO403Y1vFlHBWcENzObCxo/YQ7G0Vc1CYbp5KfQDbw6g5L1pkCv9wnNaFDrfMg158TdRKRxFmti6pNcO1/ip1KnTJRBa8n6VH6yu9ZzFPNRKwNvIkexjNyKh2lo5nl3qUiGrRFXvXYrrVSdarchRksPaAWboGkhu/G9DOGjqVQM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763682489; c=relaxed/simple; bh=E1UP2MyVl7HnY7WuedrGQ9AOpWu6E629kSlXepA6pP4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=J4thXXnG+VwP1fWVuNHF3C8V0ErV68HIbbvrmZRmL5hH3P1paxAOTmXtPAyRZTohmoPMpsIdMLLyObX/fNXYzTAZrZ8kTiGa2ca+rtZHNPksUeqzJOguJqy7d3IZzPePBk3gP+PnDVREg/SvunduazmzTzeM/Ef80EcD0LVdmIU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L2UaB221; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="L2UaB221" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4612FC116B1; Thu, 20 Nov 2025 23:48:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763682488; bh=E1UP2MyVl7HnY7WuedrGQ9AOpWu6E629kSlXepA6pP4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L2UaB22144DheGYE9Yk1H3ycH85Pd4P/Xrj7z1CwR9jE8R2tnmMTQLFvdLX0szuRU ZEhuDDgb3eKxEeN7MAnfQYaLgLxfgCymRXSUgHcNTcJ9iBVY06cv8WrdqQsLLBnePZ +xNG7tocNmGo5/c56P6X4OgItbE7Ewk6VX12OFDylSo5Lw5XQBsMjQuZGuWJK5l3BH ifyqnAsROfc6Bea5dm/aUUpGlQ9d+qV8zdZCPtTNpMOxLNzdeGfLpcAXeZExzPnd+u 1M0Ybr2cMp73oLJMMedAWecxX3i9oFj8ibOvnLULGwXkspzJwbrvSlYQiLUDTHivcU u3JJ00GaVNVew== From: Namhyung Kim To: Arnaldo Carvalho de Melo , Ian Rogers , James Clark Cc: Jiri Olsa , Adrian Hunter , Peter Zijlstra , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org, Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Jens Remus , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v6 1/6] tools headers UAPI: Sync linux/perf_event.h for deferred callchains Date: Thu, 20 Nov 2025 15:47:59 -0800 Message-ID: <20251120234804.156340-2-namhyung@kernel.org> X-Mailer: git-send-email 2.52.0.rc2.455.g230fcf2819-goog In-Reply-To: <20251120234804.156340-1-namhyung@kernel.org> References: <20251120234804.156340-1-namhyung@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" It needs to sync with the kernel to support user space changes for the deferred callchains. Reviewed-by: Ian Rogers Signed-off-by: Namhyung Kim --- tools/include/uapi/linux/perf_event.h | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/lin= ux/perf_event.h index 78a362b8002776e5..d292f96bc06f86bc 100644 --- a/tools/include/uapi/linux/perf_event.h +++ b/tools/include/uapi/linux/perf_event.h @@ -463,7 +463,9 @@ struct perf_event_attr { inherit_thread : 1, /* children only inherit if cloned with CLONE_THR= EAD */ remove_on_exec : 1, /* event is removed from task on exec */ sigtrap : 1, /* send synchronous SIGTRAP on event */ - __reserved_1 : 26; + defer_callchain: 1, /* request PERF_RECORD_CALLCHAIN_DEFERRED records= */ + defer_output : 1, /* output PERF_RECORD_CALLCHAIN_DEFERRED records = */ + __reserved_1 : 24; =20 union { __u32 wakeup_events; /* wake up every n events */ @@ -1239,6 +1241,22 @@ enum perf_event_type { */ PERF_RECORD_AUX_OUTPUT_HW_ID =3D 21, =20 + /* + * This user callchain capture was deferred until shortly before + * returning to user space. Previous samples would have kernel + * callchains only and they need to be stitched with this to make full + * callchains. + * + * struct { + * struct perf_event_header header; + * u64 cookie; + * u64 nr; + * u64 ips[nr]; + * struct sample_id sample_id; + * }; + */ + PERF_RECORD_CALLCHAIN_DEFERRED =3D 22, + PERF_RECORD_MAX, /* non-ABI */ }; =20 @@ -1269,6 +1287,7 @@ enum perf_callchain_context { PERF_CONTEXT_HV =3D (__u64)-32, PERF_CONTEXT_KERNEL =3D (__u64)-128, PERF_CONTEXT_USER =3D (__u64)-512, + PERF_CONTEXT_USER_DEFERRED =3D (__u64)-640, =20 PERF_CONTEXT_GUEST =3D (__u64)-2048, PERF_CONTEXT_GUEST_KERNEL =3D (__u64)-2176, --=20 2.52.0.rc2.455.g230fcf2819-goog