From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 EB1423659FA for ; Mon, 23 Feb 2026 12:25:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771849541; cv=none; b=Rej8jAnIylnw/8LoM8Obs61NteJlTVxG+QpmozyAAjsMLaSHPIySrR55NTUVS8w/M1c4hvEUmrHOEloIH2i0fHsfmLulMMU56MQYRY9gnPHhFQ2N5ReQs3clFupHxiy8SPoAmIb10nXOLbc7vK6OaBpQRo9CbVnD0TwjUvhKI70= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771849541; c=relaxed/simple; bh=bhrLQQJp2WQsx6938rZMvGl+P0gSUC705eDDZ+boG5I=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=UwxSqOYSpfQT7+dVKLPDVZaAWawgtl3yHxS7wILf9M4okPqb4G1fls6c0gAD6hX9y9P5tsU8xeqCXzLESwME0CJocOHThHLhQYccKbbMEfyYFPPYDF2xjDL4fK3Ytpqp1bqmzlCh5l8nZsEWf01SQAIb8aOKjdGmSjePrPDN9UY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Rk1wdjyc; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Rk1wdjyc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1771849538; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=x5FQ6M7OFu5xYX66DzT3ohEMtpWo7tpNCXWHYTmCBVA=; b=Rk1wdjycKVz7pSnu99t4E1F7iumbvgaK7/Ct6TuxbGeWfG/lkhQ54mmu2op70rlH8OxlMG DW3jLErUxZVMnM7/mlZaXhSmjctYcDHEsysncEabdX6ZA/mY4NTPasUxTdNwFBA0617r3/ lrbn9KyO+0NXSJozJwaQ2l7+KGY6lHs= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-689-7zdBn13qPH2QtNK7Q8G8Vg-1; Mon, 23 Feb 2026 07:25:35 -0500 X-MC-Unique: 7zdBn13qPH2QtNK7Q8G8Vg-1 X-Mimecast-MFC-AGG-ID: 7zdBn13qPH2QtNK7Q8G8Vg_1771849533 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 262B71956094; Mon, 23 Feb 2026 12:25:33 +0000 (UTC) Received: from Carbon (unknown [10.44.22.3]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0116830001BE; Mon, 23 Feb 2026 12:25:26 +0000 (UTC) Date: Mon, 23 Feb 2026 13:25:23 +0100 (CET) From: Michael Petlan To: Ravi Bangoria cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Dapeng Mi , James Clark , Sadasivan Shaiju , x86@kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Manali Shukla , Santosh Shukla , Ananth Narayan , Sandipan Das Subject: Re: [PATCH v2 1/5] perf/amd/ibs: Account interrupt for discarded samples In-Reply-To: <20260216042216.1440-2-ravi.bangoria@amd.com> Message-ID: <79e0c820-e934-47a1-abd-3612e82b310@redhat.com> References: <20260216042216.1440-1-ravi.bangoria@amd.com> <20260216042216.1440-2-ravi.bangoria@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Hi Ravi, On Mon, 16 Feb 2026, Ravi Bangoria wrote: > 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. > Maybe worth tagging Fixes: 26db2e0c51fe83e1dd852c1321407835b481806e ("perf/x86/amd/ibs: Work around erratum #1197") Fixes: d20610c19b4a22bc69085b7eb7a02741d51de30e ("perf/amd/ibs: Add support for OP Load Latency Filtering") ? Cheers, Michael > Signed-off-by: Ravi Bangoria > --- > 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 aca89f23d2e0..705ef43325be 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; > -- > 2.43.0 > > >