From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C8F503EAC83; Wed, 20 May 2026 16:27:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779294468; cv=none; b=sKzZM8IBp93Fx7HAsgYf27n8neplaBWSxdNTFEBOrZs8dRZYkUAxA034kn4kdrDVcXvUPIJn4mLLtTbm9A6kpLjiguTNTJeJ4KVgU/+lhD2kQfxcoHUl6G+HlZuyQ21apRHu5RYLSAlt84K9NEKfxJ5BNAgWwFa8pUEo3bEJKWQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779294468; c=relaxed/simple; bh=xnghIO0jLWqZZI9Iv78VymRjMfoG27rLm1uvFq6oBBc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Jhqp2bAcB59ZI6HT707nXU02Xu+VSXwqBan87qd+woFLdQ6voAbgjLEddLrMnDdPL6Q1qPw5cMV4FF9l6dSeBJN98AWwezFq77HMUXOha76RSHDg7hfEf93JQuEpnldB4izL6r812pxDvti6mtophbCPmLfajjMEQVPSkMsiqOQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0/cZkAmG; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0/cZkAmG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01BFD1F00893; Wed, 20 May 2026 16:27:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779294466; bh=ZIVfmAk+yRcji5LkFmC6jEqT59J5Ry5ezw8JRlp6IR0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=0/cZkAmG/sVPjdvSPnsCegr0AvOxHYeHwAGxNqewubltm1T5lMyoNgLRrtZMglxnv POH8Pexj5bqHDozdWlSPJp604VRAYbNI9X3NFlGF30oMFbtK9Lu2lmkok24LAtlpLg QCsJYibx4yZI9Fab62KVAhmao60GaNNprvR7kUWU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ravi Bangoria , "Peter Zijlstra (Intel)" , Namhyung Kim , Sasha Levin Subject: [PATCH 7.0 0051/1146] perf/amd/ibs: Account interrupt for discarded samples Date: Wed, 20 May 2026 18:05:01 +0200 Message-ID: <20260520162149.528921999@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162148.390695140@linuxfoundation.org> References: <20260520162148.390695140@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ravi Bangoria [ Upstream commit 01336b5559785a136de1cac49705f63a70a755bc ] Add interrupt throttling accounting for below cases: o IBS Op PMU: A software filter (in addition to the hardware filter) drops samples whose load latency is below the user-specified threshold. o IBS Fetch PMU: Samples discarded due to the zero-RIP erratum (#1197). Although these samples are discarded, the NMI cost is still incurred, so they should be counted for interrupt throttling. Fixes: 26db2e0c51fe83e1dd852c1321407835b481806e ("perf/x86/amd/ibs: Work around erratum #1197") Fixes: d20610c19b4a22bc69085b7eb7a02741d51de30e ("perf/amd/ibs: Add support for OP Load Latency Filtering") Signed-off-by: Ravi Bangoria Signed-off-by: Peter Zijlstra (Intel) Acked-by: Namhyung Kim Link: https://patch.msgid.link/20260216042216.1440-2-ravi.bangoria@amd.com Signed-off-by: Sasha Levin --- arch/x86/events/amd/ibs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index aca89f23d2e00..705ef43325be3 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -1293,8 +1293,10 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) * within [128, 2048] range. */ if (!op_data3.ld_op || !op_data3.dc_miss || - op_data3.dc_miss_lat <= (event->attr.config1 & 0xFFF)) + op_data3.dc_miss_lat <= (event->attr.config1 & 0xFFF)) { + throttle = perf_event_account_interrupt(event); goto out; + } } /* @@ -1326,8 +1328,10 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs) regs.flags &= ~PERF_EFLAGS_EXACT; } else { /* Workaround for erratum #1197 */ - if (perf_ibs->fetch_ignore_if_zero_rip && !(ibs_data.regs[1])) + if (perf_ibs->fetch_ignore_if_zero_rip && !(ibs_data.regs[1])) { + throttle = perf_event_account_interrupt(event); goto out; + } set_linear_ip(®s, ibs_data.regs[1]); regs.flags |= PERF_EFLAGS_EXACT; -- 2.53.0