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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-31586402e53sm32643473eec.11.2026.08.05.21.42.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2026 21:42:48 -0700 (PDT) From: Sibi Sankar To: rafael@kernel.org, viresh.kumar@linaro.org, mingo@redhat.com, peterz@infradead.org, linux-arm-msm@vger.kernel.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com Cc: linux-kernel@vger.kernel.org, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, linux-pm@vger.kernel.org Subject: [PATCH 2/2] sched/cpufreq: Update schedutil's DVFS request to reach the boost frequencies Date: Thu, 6 Aug 2026 10:12:30 +0530 Message-Id: <20260806044230.909961-3-sibi.sankar@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260806044230.909961-1-sibi.sankar@oss.qualcomm.com> References: <20260806044230.909961-1-sibi.sankar@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: bhfIA0nG8dsPAadaX7oF_rtCzTGJ_Zcj X-Proofpoint-ORIG-GUID: bhfIA0nG8dsPAadaX7oF_rtCzTGJ_Zcj X-Authority-Analysis: v=2.4 cv=a48AM0SF c=1 sm=1 tr=0 ts=6a7410ca cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=uMDrv-Gue8sy1whakgkA:9 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwODA2MDAzMiBTYWx0ZWRfX0T2ds0KkEbse +ic+nF+giU6q2CRI8O0YyC6WtWxMqduDJmzbQjMPEHk8zfAmbpeY/P1UzCmrdUoCFSd8T9sxIN4 BsQnMbSZ+OzxaxUl8FAUNppqMkUnmyc= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA2MDAzMiBTYWx0ZWRfX/l50Q01EUN0E 6qSREa1llOsmg9cGV778wj45IkVLFkDRy92K9hYlG4+y3tpGnHFETvhBwLE9Lm22uqu9Ule4nr4 QI8IdQiN0ZK8YQ5QPZ2glCClj0MNCpORYMAk4xV0HNtZjRCodW3oNAeWbBtuApheV4izloZYmtV Xxfzeck5HbN73cIvIge5FuyMxAL2v/BbP3WIJviNoFSW3VDDvQwF70hDwHo/zJ1eVsREXY2AAS6 Bx6kFHLrNu3UoIZhx86/DUCSr4w2TdkCdjDI6TFfvc+zzL6EU457MHjuy+I1CC6TF6OD9k6ABHd XB/F310Qmu08LpMIIyh5hxUQIdi9vj1Jf5boa1IU8S8R6sUjybqOWOtDWqx1z2TxKAWnLAns1ZS TDVaVlrjrtWReADo6yng2ajNSdUmWd4LEcoG2MBpSBaVT6RFGRfQHX1v/gM2VYgilwgfKO9TKCu AnUh08fypOUE75oB0Qw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-05_06,2026-08-05_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 suspectscore=0 spamscore=0 phishscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608060032 capacity_freq_ref, exposed to schedutil via get_capacity_ref_freq(), was introduced by commit 9942cb22ea45 ("sched/topology: Add a new arch_scale_freq_ref() method") as a fixed anchor that does not move at runtime. However, schedutil uses that same fixed anchor as the reference plugged into map_util_freq() which saturates exactly at capacity_freq_ref. As a result, a system with cpufreq boost enabled effectively never runs at boost frequencies under schedutil-governed load. Fix this by plugging in policy-max into the map_util_freq equation, so that the DVFS requests translates to the actual cpufreq driver ceiling. Signed-off-by: Sibi Sankar --- kernel/sched/cpufreq_schedutil.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index a1782755efcc..dcefbeaa0702 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -195,10 +195,17 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy, unsigned long util, unsigned long max) { struct cpufreq_policy *policy = sg_policy->policy; - unsigned int freq; + unsigned int freq, ref; - freq = get_capacity_ref_freq(policy); - freq = map_util_freq(util, freq, max); + ref = get_capacity_ref_freq(policy); + + /* + * That fixed anchor governs how utilization is interpreted, but + * the DVFS request is free to target the current policy ceiling. + * Using ref alone would saturate the util->freq map at ref so + * use policy->max to reach boost frequencies. + */ + freq = map_util_freq(util, max(ref, READ_ONCE(policy->max)), max); if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update) return sg_policy->next_freq; -- 2.34.1