From patchwork Fri Apr 15 19:20:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12815254 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 E443AC433EF for ; Fri, 15 Apr 2022 19:20:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349137AbiDOTWr (ORCPT ); Fri, 15 Apr 2022 15:22:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349213AbiDOTWc (ORCPT ); Fri, 15 Apr 2022 15:22:32 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E759C4ECDF; Fri, 15 Apr 2022 12:20:02 -0700 (PDT) Message-ID: <20220415161206.817702355@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1650050401; 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: references:references; bh=qYlJQfHkHU3OcbS1sZiLCAQudGl6ztMYHcAA/fZFZtk=; b=LGrEszF/kAbRdvl567m34oAJJwz6dSvwrSujKNtfqxO5EjZbvxWHXoa7KE4CADQ81/OLF+ RW5qo5WMfL3b5HhfId8wAF/jGnftRn0wRUX1Ua4lA9yUqDXMYMlEcjJy1LKezycjjGGSgv ZetZKg6MxikTsS2pZrIkn/z86aqmMDTPIz1He9z6zajGmttD2jaWoNifRxOIl6brLYYBH2 ws9U79kWuK4WGwDDRJNQdL0QJQFFV21//V9+fTxdT1C9JEZW+1l8Msv1tFAOv71/7UhgXN 4x2hI2Rj5H/9Bb/D+kJdUTU04zYVIqolE0sMvLohIvfaMmx3puYP5rythOfPRQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1650050401; 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: references:references; bh=qYlJQfHkHU3OcbS1sZiLCAQudGl6ztMYHcAA/fZFZtk=; b=xY8Yx/ZD3ZaZx9KpDsiElK70nuaf4eZgpdAo75DVNrviEEvSAVT7PUlS2wbwCiCLjZ4pwl cYiTgYGA3aULu3Dw== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, "Rafael J. Wysocki" , linux-pm@vger.kernel.org, Eric Dumazet , "Paul E. McKenney" Subject: [patch 08/10] x86/aperfmperf: Store aperf/mperf data for cpu frequency reads References: <20220415133356.179706384@linutronix.de> MIME-Version: 1.0 Date: Fri, 15 Apr 2022 21:20:01 +0200 (CEST) Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Now that the MSR readout is unconditional, store the results in the per CPU data structure along with a jiffies timestamp for the CPU frequency readout code. Signed-off-by: Thomas Gleixner Acked-by: Rafael J. Wysocki --- arch/x86/kernel/cpu/aperfmperf.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) --- a/arch/x86/kernel/cpu/aperfmperf.c +++ b/arch/x86/kernel/cpu/aperfmperf.c @@ -24,11 +24,17 @@ #include "cpu.h" struct aperfmperf { + seqcount_t seq; + unsigned long last_update; + u64 acnt; + u64 mcnt; u64 aperf; u64 mperf; }; -static DEFINE_PER_CPU_SHARED_ALIGNED(struct aperfmperf, cpu_samples); +static DEFINE_PER_CPU_SHARED_ALIGNED(struct aperfmperf, cpu_samples) = { + .seq = SEQCNT_ZERO(cpu_samples.seq) +}; struct aperfmperf_sample { unsigned int khz; @@ -515,6 +521,12 @@ void arch_scale_freq_tick(void) s->aperf = aperf; s->mperf = mperf; + raw_write_seqcount_begin(&s->seq); + s->last_update = jiffies; + s->acnt = acnt; + s->mcnt = mcnt; + raw_write_seqcount_end(&s->seq); + scale_freq_tick(acnt, mcnt); }