From nobody Mon Feb 9 01:21:00 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C241EEB64D7 for ; Tue, 20 Jun 2023 07:13:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230488AbjFTHNF (ORCPT ); Tue, 20 Jun 2023 03:13:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231215AbjFTHMz (ORCPT ); Tue, 20 Jun 2023 03:12:55 -0400 Received: from out30-112.freemail.mail.aliyun.com (out30-112.freemail.mail.aliyun.com [115.124.30.112]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9D691E7; Tue, 20 Jun 2023 00:12:53 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R951e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=renyu.zj@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0Vlamlc3_1687245167; Received: from srmbuffer011165236051.sqa.net(mailfrom:renyu.zj@linux.alibaba.com fp:SMTPD_---0Vlamlc3_1687245167) by smtp.aliyun-inc.com; Tue, 20 Jun 2023 15:12:48 +0800 From: Jing Zhang To: Will Deacon , Mark Rutland , Jonathan Corbet , John Garry , Shuai Xue , Ian Rogers Cc: Robin Murphy , James Clark , Mike Leach , Leo Yan , Ilkka Koskinen , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Adrian Hunter , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-doc@vger.kernel.org, Zhuo Song , Jing Zhang Subject: [PATCH v4 4/4] docs: perf: Update metric usage for Alibaba's T-Head PMU driver Date: Tue, 20 Jun 2023 15:12:36 +0800 Message-Id: <1687245156-61215-5-git-send-email-renyu.zj@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1687245156-61215-1-git-send-email-renyu.zj@linux.alibaba.com> References: <1687245156-61215-1-git-send-email-renyu.zj@linux.alibaba.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Alibaba's T-Head ali_drw PMU supports DDR bandwidth metrics. Update its usage in the documentation. Signed-off-by: Jing Zhang Acked-by: Ian Rogers Reviewed-by: John Garry --- Documentation/admin-guide/perf/alibaba_pmu.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/admin-guide/perf/alibaba_pmu.rst b/Documentation= /admin-guide/perf/alibaba_pmu.rst index 11de998..7d84002 100644 --- a/Documentation/admin-guide/perf/alibaba_pmu.rst +++ b/Documentation/admin-guide/perf/alibaba_pmu.rst @@ -88,6 +88,11 @@ data bandwidth:: -e ali_drw_27080/hif_rmw/ \ -e ali_drw_27080/cycle/ -- sleep 10 =20 +Example usage of counting all memory read/write bandwidth by metric:: + + perf stat -M ddr_read_bandwidth.all -- sleep 10 + perf stat -M ddr_write_bandwidth.all -- sleep 10 + The average DRAM bandwidth can be calculated as follows: =20 - Read Bandwidth =3D perf_hif_rd * DDRC_WIDTH * DDRC_Freq / DDRC_Cycle --=20 1.8.3.1