From nobody Fri Dec 19 08:56:25 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 A55EF18FDB9 for ; Fri, 30 Aug 2024 23:29:13 +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=1725060553; cv=none; b=IOePOgWRM1z8GFy66t7Y8IRvSU/yFCp/35Te8i+mFFm0i6OVKSk0IpNaC3KBN7q1ARaBq4acH2A1Xp8Ybed/C26AzHZylxtRhXPijDKYTFHfmKp4YQi0yqK85DsN7KrPTeSmi+Kx828wlgWIT/NjBiZDmxlcX4DvArzenCFXS4A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725060553; c=relaxed/simple; bh=prH0/SeaSKC9p22Ln6Tcjz4jujhD5pDE9JLweDDsE+Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZFrW0e1NGEVqAMn7pFUuWdXd3LT7CekOxoq60ZLFjcrCHN+TbqjiJoVx3f78gF4UnsDqqc02TlR6BVVlEwnigEf71b5oRk70GsNIK2KFClsT1QhcSPus2P8gkCDEVU6yafz3uyw6PPNjkQctmdqYS0tHxurQkXiLX631cUrs8nA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lk4VnZKU; 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="lk4VnZKU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC94BC4CECA; Fri, 30 Aug 2024 23:29:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725060553; bh=prH0/SeaSKC9p22Ln6Tcjz4jujhD5pDE9JLweDDsE+Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lk4VnZKUIeNyGC2mJNoDVRkWUWyNRvRpH0MCIBhg57cokFqXiZAXf9dG6VeOYG+Sj si/jD+B/YWvSqot4QSVjfHapkyXX2xTGyqNStpyM70wKWGI25tI3BGs43kSXmufTD2 BAOlINdpc/26xP2/+I4+YnD/pdqTI3zKqQfBZtnYa472/5gphyUj+DT0wwH25nHZ4W 1WdkGZmokHDaA2yHS5PP+NbPrKMF4LbtuP8E2qsWB9lXEXHj5ltD0vJjQWLdIlStpi /4/C21ywBUZHp+pe4mtuallsEorKhFg4BSDM9qFwK/D0qwIkD8elpHydrjKw88ECUa aTKGF+EsT6iUA== From: Namhyung Kim To: Peter Zijlstra , Ingo Molnar Cc: Kan Liang , Mark Rutland , Alexander Shishkin , Arnaldo Carvalho de Melo , LKML , Stephane Eranian , Ravi Bangoria Subject: [RFC/PATCH 3/4] perf/core: Account dropped samples from BPF Date: Fri, 30 Aug 2024 16:29:09 -0700 Message-ID: <20240830232910.1839548-4-namhyung@kernel.org> X-Mailer: git-send-email 2.46.0.469.g59c65b2a67-goog In-Reply-To: <20240830232910.1839548-1-namhyung@kernel.org> References: <20240830232910.1839548-1-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" Like in the software events, the BPF overflow handler can drop samples by returning 0. Let's count the dropped samples here too. Signed-off-by: Namhyung Kim --- kernel/events/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 8250e76f6335..ba1f6b51ea26 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9808,8 +9808,10 @@ static int __perf_event_overflow(struct perf_event *= event, =20 ret =3D __perf_event_account_interrupt(event, throttle); =20 - if (event->prog && !bpf_overflow_handler(event, data, regs)) + if (event->prog && !bpf_overflow_handler(event, data, regs)) { + atomic64_inc(&event->dropped_samples); return ret; + } =20 /* * XXX event_limit might not quite work as expected on inherited --=20 2.46.0.469.g59c65b2a67-goog