From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f169.google.com (mail-pl1-f169.google.com [209.85.214.169]) (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 B1E422FFDDB for ; Wed, 19 Nov 2025 16:49:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.169 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763570960; cv=none; b=Q0qyeKTPlAiMfEi8np1uLcnwh4ousq2k2r9yh1TOgat7QrCwMUY8moxcjEHFFnoT/4YUHSUU/hNZud6JOFRWTVWuV1kWJrqS8ptLO/KRW6bW9NtxaKMeMcnP1NkUw/dSWDqUtCXNWsIKRNC4+gS5JmIhGf4+gLgYjU/+IoDyRU8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763570960; c=relaxed/simple; bh=Ntu79LxvHkkLpbqi13VepeqzmJSPf4zQKMOz7mKoU6c=; h=MIME-Version:References:In-Reply-To:From:Date:Message-ID:Subject: To:Cc:Content-Type; b=Rkc5geYIpkGdmEH4Kp2PYeGHoI6K0OXaGkA9r8ezk1VP9HHoTbsazxYFt0r3LNymYLCbp90+bg1KmGy7eHeB4reAHx2q1NjoBwvUF/OlGXgMQhjkIM/adkol2s9iusxtstdorhZiavQk4X0OVE1qsy1YcIWXLmWheITIBmSX02U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=N/Z7EAfl; arc=none smtp.client-ip=209.85.214.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="N/Z7EAfl" Received: by mail-pl1-f169.google.com with SMTP id d9443c01a7336-297e13bf404so233315ad.0 for ; Wed, 19 Nov 2025 08:49:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1763570958; x=1764175758; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=sMXsqgKysW6m2FrQa3pYXbUBYKL4TuiIPv4CnNvKLAM=; b=N/Z7EAflTrqkSa+dBTG00mPJcJj10qpHqDUcXhnWgiUdD7VA9XqflFc7mZhDTYENhY 3/fXZrtoxHNjGROS8ZtfNr/Ba1ruzOh2CTr+TLDKy5fsztwK9PTEht9xy82c49hQ/DNt 0q10JSXzEQpzs3DG61sERP1Z3ikTunZ1v7h0R/PfgUFEXuTGidRdGB+OPeix7nCcz5YX HmSReT19XnvcxLHETPaRo4xVHc7LBgAqTmxJsq+5cyHN9AbcybeVUB0MJA2ut4Ajlj2p pDu5KTBAeAL2cqWvJ/o4YUD2Uv4TiLGe4cQDhe91tNq/KEVH69zh68lT6zZkmTMoksRC yjtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763570958; x=1764175758; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=sMXsqgKysW6m2FrQa3pYXbUBYKL4TuiIPv4CnNvKLAM=; b=G64N0pNQ23h3eIN7w8R+OnZ3Dua8nXXKDC3vwEL7E8bnwuC6HNIvvuAl6JsKz1YyGA U8UGwP+WGij08HvxqZAX658j5DtbmiB32y4Z5YuObfn4nZHk6IP7Cfk8gQzTSNwmoQDM 45cZ3IfnW/MOb7jQfXfq1trFvMRduyhSGILHLgK2G8mUXXCMTWTNdpOxHCuAWwnNahH5 4uB/wnvQraHWZA+g/kO7gUnBc9szzalwhHBUdZYzHY7KS9yKqS8JHW3hsG9vE4SoRzTx Iq/lgJk6TDHEzRnJ8NF8ggfbyGS8itfGU9Y9Xb3RBAZS7rDlJMGFk43GNmVJPbiASgb4 LoEA== X-Forwarded-Encrypted: i=1; AJvYcCVPFejHsa1IUOuMfm8Mbni8LWVaRdUpDAn0Tway9lq31R7ALluCUyScP14+5RhlbyCcwKPO8deVwhXjV1ycx1c8Dec=@vger.kernel.org X-Gm-Message-State: AOJu0YwqIdhKw7p+i4/le6bYuvCZBfSItp95EmU4mDUDJZNzp0+nUVRd 6jaz5X4ufZrhk5XUufBDIskdnzG0xrtpHZh1i/UugL96eTDrl3MscAmFH7sruYOfDpwz7ryGflY B2etMmTNrxnb9NCfQnQuelfxxXRsbuOajIMbAcBsM X-Gm-Gg: ASbGnctAyfn9J269wVk55BlTW1mNSTGRYx94ESWKqj+M3Vqc2ZQCyZTBaFFFumhYl3j uTzx1AIk6nw+TRrRKK7P949Ewiyylxn8Ta1Itvcjtk714hUp7JAa2too4b3Zvk0GcQEq4MvPBuP XsqyXu5vAqtiYu4v3wP64aMruTk2mgQVq1gaub9ry6W8wVmLion+lWK5bbzHaM9PPKLoKazU2RB 4k1dK9TpAP3Y8UzF2OpzmS7szv+EXo2vSmVc1c9WiVI0/yGvt0QSQoMbaWDyOUblsVrbrT/V+as Gcwz9kKpgnu7aeKKholTHheFRQ== X-Google-Smtp-Source: AGHT+IFwgAnkLR0jx5LdmWn3kQVmzzBqFc3ZBGwWcfrEixV6e2Vn8lfZW5HJjzboKiJOREeEKIkahsDPoO/Vh1R3le4= X-Received: by 2002:a05:7022:e01:b0:119:e55a:808c with SMTP id a92af1059eb24-11c8ddae890mr119358c88.9.1763570957615; Wed, 19 Nov 2025 08:49:17 -0800 (PST) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20251115234106.348571-1-namhyung@kernel.org> <20251115234106.348571-2-namhyung@kernel.org> In-Reply-To: <20251115234106.348571-2-namhyung@kernel.org> From: Ian Rogers Date: Wed, 19 Nov 2025 08:49:05 -0800 X-Gm-Features: AWmQ_bmWEG9oywEpm1PC44iobFk4gdVnk4-eYJda-DCWGCTGZHFeOLwBPXQD-Lg Message-ID: Subject: Re: [PATCH v4 1/5] tools headers UAPI: Sync linux/perf_event.h for deferred callchains To: Namhyung Kim Cc: Arnaldo Carvalho de Melo , James Clark , 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, Nov 15, 2025 at 3:41=E2=80=AFPM Namhyung Kim = wrote: > > It needs to sync with the kernel to support user space changes for the > deferred callchains. > > Signed-off-by: Namhyung Kim Reviewed-by: Ian Rogers Thanks, Ian > --- > 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/l= inux/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 inh= erit if cloned with CLONE_THREAD */ > 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_RECO= RD_CALLCHAIN_DEFERRED records */ > + defer_output : 1, /* output PERF_RECOR= D_CALLCHAIN_DEFERRED records */ > + __reserved_1 : 24; > > union { > __u32 wakeup_events; /* wake up every n even= ts */ > @@ -1239,6 +1241,22 @@ enum perf_event_type { > */ > PERF_RECORD_AUX_OUTPUT_HW_ID =3D 21, > > + /* > + * 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 */ > }; > > @@ -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, > > PERF_CONTEXT_GUEST =3D (__u64)-2048, > PERF_CONTEXT_GUEST_KERNEL =3D (__u64)-2176, > -- > 2.52.0.rc1.455.g30608eb744-goog >