From nobody Fri Feb 13 05:53:33 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 D2345524DC; Fri, 12 Apr 2024 10:03:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712916208; cv=none; b=iKHSyXQH+hZM9imqb+u9/OT4zReNjS4YX7mpEtSGH7g2ozBtel7rfMFm4pySZfg/et5K2b+HIttB0sPt1QvjkTyQ2bwaoh9+n/UO+5s+lvALZKSYQMDjn0co+gK/oiSNPSlZFHVL4UtNpA/oa/PFEbSL5mj2lg8NKDje9su2qiQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712916208; c=relaxed/simple; bh=bEl3kUTpvDa4VaEDle7B8um9qQie+8Rg3DQQlt/FmUo=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=jxoQGx7zO5ku2A81if30ulVfWX9U/U4848RBcRPiV+/5hoMdoGJQxyXGTI7ing5s7nPyL4+zwhgTPhXJoH2TszOkJjr+G6bMAjLnRMfZ4Efdm/opE5sLRvLlpObmnFRDk2CwZL/r/450sV8uAH2ZfZPYaO9blBocBe6w2pCMgPE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=mG/TtnUT; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=NOr7y53a; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="mG/TtnUT"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="NOr7y53a" Date: Fri, 12 Apr 2024 10:03:23 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1712916204; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eSJ6PCd5VkQ7nahH5WRJCH3XFdhG1eWcn/lOpn9ozUU=; b=mG/TtnUTRfJybUn2YJemYZVP/a5w5GR3VhvZPwbLVvrw6VS0Yb+BV+kuxavO+a8qBhWq2s UQWQ9vicw5GED8jketOiVDBgYmrNlqSw1iW2Zy91K3jzBbKRXb1Jzb/CSvZNsMBPyyJwFs hzB3I4GYcfBJG3N4j479Zq9daq9R41tZPb3OMkjW1xbZ0in85tRrB0auWpa7EAmrwv/J3Y Jg3FXCBJBHvLxhYeh2SiyQCBU+jYVRSNFshgvEeZLMFDbovG35Gg0MVYkVhfHd6qwx3t12 NtaPmgxZQbBhtq7U/VEetQ7+kMvSrnI6nsJPM6IPaOe+ySZFw4xSSdxcAywUEQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1712916204; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eSJ6PCd5VkQ7nahH5WRJCH3XFdhG1eWcn/lOpn9ozUU=; b=NOr7y53atvqb6HGacNnpJxa4q7DMaORNh22mhuDJ5pmp2NswBaOpyBe0JBXxSU+zLyaETm A1CsSCjOzqai1jAg== From: "tip-bot2 for Kyle Huey" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: perf/core] perf/bpf: Allow a BPF program to suppress all sample side effects Cc: Kyle Huey , Ingo Molnar , Song Liu , Jiri Olsa , Namhyung Kim , Andrii Nakryiko , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20240412015019.7060-7-khuey@kylehuey.com> References: <20240412015019.7060-7-khuey@kylehuey.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <171291620346.10875.14979532789812701380.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the perf/core branch of tip: Commit-ID: c4fcc7d1f41532e878087c7c43f4cf247604d68b Gitweb: https://git.kernel.org/tip/c4fcc7d1f41532e878087c7c43f4cf247= 604d68b Author: Kyle Huey AuthorDate: Thu, 11 Apr 2024 18:50:18 -07:00 Committer: Ingo Molnar CommitterDate: Fri, 12 Apr 2024 11:49:50 +02:00 perf/bpf: Allow a BPF program to suppress all sample side effects Returning zero from a BPF program attached to a perf event already suppresses any data output. Return early from __perf_event_overflow() in this case so it will also suppress event_limit accounting, SIGTRAP generation, and F_ASYNC signalling. Signed-off-by: Kyle Huey Signed-off-by: Ingo Molnar Acked-by: Song Liu Acked-by: Jiri Olsa Acked-by: Namhyung Kim Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/r/20240412015019.7060-7-khuey@kylehuey.com --- kernel/events/core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index c6a6936..2212670 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -9677,6 +9677,9 @@ static int __perf_event_overflow(struct perf_event *e= vent, =20 ret =3D __perf_event_account_interrupt(event, throttle); =20 + if (event->prog && !bpf_overflow_handler(event, data, regs)) + return ret; + /* * XXX event_limit might not quite work as expected on inherited * events @@ -9726,8 +9729,7 @@ static int __perf_event_overflow(struct perf_event *e= vent, irq_work_queue(&event->pending_irq); } =20 - if (!(event->prog && !bpf_overflow_handler(event, data, regs))) - READ_ONCE(event->overflow_handler)(event, data, regs); + READ_ONCE(event->overflow_handler)(event, data, regs); =20 if (*perf_event_fasync(event) && event->pending_kill) { event->pending_wakeup =3D 1;