From patchwork Mon Jan 24 18:45:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 12723019 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 DC208C4332F for ; Tue, 25 Jan 2022 00:23:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2375358AbiAYAT4 (ORCPT ); Mon, 24 Jan 2022 19:19:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2364073AbiAXXqo (ORCPT ); Mon, 24 Jan 2022 18:46:44 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C400C0613B2; Mon, 24 Jan 2022 13:42:01 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0C15F6150E; Mon, 24 Jan 2022 21:42:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0449C340E4; Mon, 24 Jan 2022 21:41:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643060520; bh=bZB8LXzuRpRqd1OdmxiHwhFIwlaujiAsLxkUGVGfxqo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nymYwyfvy6p62pEdV4oxB9yEl7aA72qMZTqyki7Vu8K9OL9yk8q8tieh5cGHg+hLD apqBqd6b25oesLzGaR9TW4ExBYCPIjDM/5xPaRWN1ZHyFAxMr09Xqm5Ym8AYzwvil3 +HdgwuNVxgtlVT6o4+0h3h9S3oxbsvBVRgJ5dFho= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chase Conklin , German Gomez , Alexander Shishkin , Ian Rogers , Jiri Olsa , John Fastabend , KP Singh , Mark Rutland , Martin KaFai Lau , Namhyung Kim , Song Liu , Stephane Eranian , Yonghong Song , bpf@vger.kernel.org, netdev@vger.kernel.org, Arnaldo Carvalho de Melo Subject: [PATCH 5.16 0943/1039] perf evsel: Override attr->sample_period for non-libpfm4 events Date: Mon, 24 Jan 2022 19:45:32 +0100 Message-Id: <20220124184156.987692281@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124184125.121143506@linuxfoundation.org> References: <20220124184125.121143506@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: German Gomez commit 3606c0e1a1050d397ad759a62607e419fd8b0ccb upstream. A previous patch preventing "attr->sample_period" values from being overridden in pfm events changed a related behaviour in arm-spe. Before said patch: perf record -c 10000 -e arm_spe_0// -- sleep 1 Would yield an SPE event with period=10000. After the patch, the period in "-c 10000" was being ignored because the arm-spe code initializes sample_period to a non-zero value. This patch restores the previous behaviour for non-libpfm4 events. Fixes: ae5dcc8abe31 (“perf record: Prevent override of attr->sample_period for libpfm4 events”) Reported-by: Chase Conklin Signed-off-by: German Gomez Cc: Alexander Shishkin Cc: Ian Rogers Cc: Jiri Olsa Cc: John Fastabend Cc: KP Singh Cc: Mark Rutland Cc: Martin KaFai Lau Cc: Namhyung Kim Cc: Song Liu Cc: Stephane Eranian Cc: Yonghong Song Cc: bpf@vger.kernel.org Cc: netdev@vger.kernel.org Link: http://lore.kernel.org/lkml/20220118144054.2541-1-german.gomez@arm.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman --- tools/perf/util/evsel.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1064,6 +1064,17 @@ void __weak arch_evsel__fixup_new_cycles { } +static void evsel__set_default_freq_period(struct record_opts *opts, + struct perf_event_attr *attr) +{ + if (opts->freq) { + attr->freq = 1; + attr->sample_freq = opts->freq; + } else { + attr->sample_period = opts->default_interval; + } +} + /* * The enable_on_exec/disabled value strategy: * @@ -1130,14 +1141,12 @@ void evsel__config(struct evsel *evsel, * We default some events to have a default interval. But keep * it a weak assumption overridable by the user. */ - if (!attr->sample_period) { - if (opts->freq) { - attr->freq = 1; - attr->sample_freq = opts->freq; - } else { - attr->sample_period = opts->default_interval; - } - } + if ((evsel->is_libpfm_event && !attr->sample_period) || + (!evsel->is_libpfm_event && (!attr->sample_period || + opts->user_freq != UINT_MAX || + opts->user_interval != ULLONG_MAX))) + evsel__set_default_freq_period(opts, attr); + /* * If attr->freq was set (here or earlier), ask for period * to be sampled.