From patchwork Thu Sep 5 09:26:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Loehle X-Patchwork-Id: 13792017 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3C002198A01; Thu, 5 Sep 2024 09:27:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725528466; cv=none; b=eK4mo0JyIQMWs/iPfVbje9nYg05sMXecCh/4S7W5bkCWPIkzDrHx8u5uJYXc7WtSV/us3xdnVyjduE+/M+y9YOzDLbRyT8DbWYWjBTiST3rC/waQJgWxwQQRqRGbg6FfFzZqssZUZ8Vczb26e75WlypjBf7uEuUxe1nkOchELpw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725528466; c=relaxed/simple; bh=apO3ieJCTPZmZT/g1YOS/QvNSR5JN4FNa0CjdLj5DUQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=PlhMCNmsYqtdhS8VzevygKx5tpaU2mHlux20ZsocHTWtlovoQGeY+kXPQ+L4wpiz0WzX0bPzypfw6bJEmNuxlXjcIUzCwQnnHxjiYKhJ4sWZq3iCCU+sIwe/cvWF/gWjpbOrlyn4UtXFzJx9/6EYIYGIFBWmiAT0YZHhuKPUBRk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 697021063; Thu, 5 Sep 2024 02:28:11 -0700 (PDT) Received: from e127648.arm.com (unknown [10.57.75.86]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 020CE3F73F; Thu, 5 Sep 2024 02:27:40 -0700 (PDT) From: Christian Loehle To: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, rafael@kernel.org, peterz@infradead.org Cc: juri.lelli@redhat.com, mingo@redhat.com, dietmar.eggemann@arm.com, vschneid@redhat.com, vincent.guittot@linaro.org, Johannes.Thumshirn@wdc.com, adrian.hunter@intel.com, ulf.hansson@linaro.org, bvanassche@acm.org, andres@anarazel.de, asml.silence@gmail.com, linux-block@vger.kernel.org, io-uring@vger.kernel.org, qyousef@layalina.io, dsmythies@telus.net, axboe@kernel.dk, Christian Loehle Subject: [RFC PATCH 6/8] cpufreq: intel_pstate: Remove iowait boost Date: Thu, 5 Sep 2024 10:26:43 +0100 Message-Id: <20240905092645.2885200-7-christian.loehle@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240905092645.2885200-1-christian.loehle@arm.com> References: <20240905092645.2885200-1-christian.loehle@arm.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Analogous to schedutil, remove iowait boost for the same reasons. Signed-off-by: Christian Loehle --- drivers/cpufreq/intel_pstate.c | 50 ++-------------------------------- 1 file changed, 3 insertions(+), 47 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index c0278d023cfc..7f30b2569bb3 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -191,7 +191,6 @@ struct global_params { * @policy: CPUFreq policy value * @update_util: CPUFreq utility callback information * @update_util_set: CPUFreq utility callback is set - * @iowait_boost: iowait-related boost fraction * @last_update: Time of the last update. * @pstate: Stores P state limits for this CPU * @vid: Stores VID limits for this CPU @@ -245,7 +244,6 @@ struct cpudata { struct acpi_processor_performance acpi_perf_data; bool valid_pss_table; #endif - unsigned int iowait_boost; s16 epp_powersave; s16 epp_policy; s16 epp_default; @@ -2136,28 +2134,7 @@ static inline void intel_pstate_update_util_hwp_local(struct cpudata *cpu, { cpu->sample.time = time; - if (cpu->sched_flags & SCHED_CPUFREQ_IOWAIT) { - bool do_io = false; - - cpu->sched_flags = 0; - /* - * Set iowait_boost flag and update time. Since IO WAIT flag - * is set all the time, we can't just conclude that there is - * some IO bound activity is scheduled on this CPU with just - * one occurrence. If we receive at least two in two - * consecutive ticks, then we treat as boost candidate. - */ - if (time_before64(time, cpu->last_io_update + 2 * TICK_NSEC)) - do_io = true; - - cpu->last_io_update = time; - - if (do_io) - intel_pstate_hwp_boost_up(cpu); - - } else { - intel_pstate_hwp_boost_down(cpu); - } + intel_pstate_hwp_boost_down(cpu); } static inline void intel_pstate_update_util_hwp(struct update_util_data *data, @@ -2240,9 +2217,6 @@ static inline int32_t get_target_pstate(struct cpudata *cpu) busy_frac = div_fp(sample->mperf << cpu->aperf_mperf_shift, sample->tsc); - if (busy_frac < cpu->iowait_boost) - busy_frac = cpu->iowait_boost; - sample->busy_scaled = busy_frac * 100; target = READ_ONCE(global.no_turbo) ? @@ -2303,7 +2277,7 @@ static void intel_pstate_adjust_pstate(struct cpudata *cpu) sample->aperf, sample->tsc, get_avg_frequency(cpu), - fp_toint(cpu->iowait_boost * 100)); + 0); } static void intel_pstate_update_util(struct update_util_data *data, u64 time, @@ -2317,24 +2291,6 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time, return; delta_ns = time - cpu->last_update; - if (flags & SCHED_CPUFREQ_IOWAIT) { - /* Start over if the CPU may have been idle. */ - if (delta_ns > TICK_NSEC) { - cpu->iowait_boost = ONE_EIGHTH_FP; - } else if (cpu->iowait_boost >= ONE_EIGHTH_FP) { - cpu->iowait_boost <<= 1; - if (cpu->iowait_boost > int_tofp(1)) - cpu->iowait_boost = int_tofp(1); - } else { - cpu->iowait_boost = ONE_EIGHTH_FP; - } - } else if (cpu->iowait_boost) { - /* Clear iowait_boost if the CPU may have been idle. */ - if (delta_ns > TICK_NSEC) - cpu->iowait_boost = 0; - else - cpu->iowait_boost >>= 1; - } cpu->last_update = time; delta_ns = time - cpu->sample.time; if ((s64)delta_ns < INTEL_PSTATE_SAMPLING_INTERVAL) @@ -2832,7 +2788,7 @@ static void intel_cpufreq_trace(struct cpudata *cpu, unsigned int trace_type, in sample->aperf, sample->tsc, get_avg_frequency(cpu), - fp_toint(cpu->iowait_boost * 100)); + 0); } static void intel_cpufreq_hwp_update(struct cpudata *cpu, u32 min, u32 max,