From nobody Tue Apr 7 14:03:42 2026 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 EF25633C513; Thu, 26 Feb 2026 01:49:57 +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=1772070598; cv=none; b=oAVuxPCj3MhqBJQLlETb3UhgABRdlV50wsfQaWm9H8NendDF/kM8sopVeuGutcj9t4/BR6ZHYRBhGxEpqTVt9b6SPQGDFxJeg+grP4yynGhoe41UezjrMZGICGqDwUfny9EFJxzA5cR8Jc7yFLFXec4zevNVoCYDw44KYgHAwSg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772070598; c=relaxed/simple; bh=090HP7e2pVEeHOHgtSokHePn6/kBbzFR3kfoeGd59q8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=KTEsvt1FKhg6neDe8lBl2eHN/Snoz104NBe+gATl73heILCyME1o/CoMYZyjeOSU9XqdOCklwzxQNbIOrPGSoHGRe6sjgGT1MJk/E2zAjo0cc/yLTQ9un7Nti0hyuMbsdJV1YDzuZOwrWIs9+IVHD8ucCLB4fCgwlKnsK/yKtCw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qFk8tyeR; 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="qFk8tyeR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C3679C116D0; Thu, 26 Feb 2026 01:49:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772070597; bh=090HP7e2pVEeHOHgtSokHePn6/kBbzFR3kfoeGd59q8=; h=From:To:Cc:Subject:Date:From; b=qFk8tyeRn0mRx90MVGlvqfGpkOsGZgn3SB9DGHhTZAxNYPEUsMpAX8Ns6uNWl2KUe G0a5MQBcwC1/ec/THpDjRxF1AWE6vrYrwl6/ewEFBmZa6PJ0cXgeuVHjPnrk0V7AVG FQ1npifmM3w7HW7ABdjcI9fRy+Q88iL+lwziPHJ2WbmtMVerF/uRcOnqfkV+m/Wq2E Gfruu08II4Enk9fmtxWUwF9bl5NtzmDsmX4amd3FLCNKuMkCO11QQUnVxqNJ6xI0TA MylIGhN4t3RnzdZFCB2fpTObchaW2Clq8UWeje9ixyOWyCiDDrsyQQQKNg63caBA+f qX2+aYXlpr3Bg== 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, Howard Chu Subject: [PATCH] perf trace: Handle task exit in BPF syscall summary Date: Wed, 25 Feb 2026 17:49:55 -0800 Message-ID: <20260226014955.801293-1-namhyung@kernel.org> X-Mailer: git-send-email 2.53.0.414.gf7e9f6c205-goog 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" Some system calls never return because it'd terminate the calling thread. Let's hook the task exit path and update the duration of the last syscall. Before: $ sudo perf trace -as --bpf-summary -- true |& grep exit (nothing) After: $ sudo perf trace -as --bpf-summary -- true |& grep exit exit_group 1 0 0.004 0.004 0.004 0.00= 4 0.00% Signed-off-by: Namhyung Kim Acked-by: Howard Chu Reviewed-by: Ian Rogers --- tools/perf/util/bpf_skel/syscall_summary.bpf.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/bpf_skel/syscall_summary.bpf.c b/tools/perf/ut= il/bpf_skel/syscall_summary.bpf.c index 1bcd066a5199a476..4172f3c9fc483955 100644 --- a/tools/perf/util/bpf_skel/syscall_summary.bpf.c +++ b/tools/perf/util/bpf_skel/syscall_summary.bpf.c @@ -118,13 +118,11 @@ int sys_enter(u64 *ctx) return 0; } =20 -SEC("tp_btf/sys_exit") -int sys_exit(u64 *ctx) +static int do_exit(long ret) { int tid; int key =3D 0; u64 cgroup =3D 0; - long ret =3D ctx[1]; /* return value of the syscall */ struct syscall_trace *st; s64 delta; =20 @@ -150,4 +148,18 @@ int sys_exit(u64 *ctx) return 0; } =20 +SEC("tp_btf/sys_exit") +int sys_exit(u64 *ctx) +{ + long ret =3D ctx[1]; /* return value of the syscall */ + + return do_exit(ret); +} + +SEC("tp_btf/sched_process_exit") +int process_exit(u64 *ctx) +{ + return do_exit(0); +} + char _license[] SEC("license") =3D "GPL"; --=20 2.53.0.414.gf7e9f6c205-goog