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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-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=WrIb99fv c=1 sm=1 tr=0 ts=6a7410ca cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=uMDrv-Gue8sy1whakgkA:9 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-GUID: NQUYS9lGbFemW86eTSthjeW-2oF6xPOi X-Proofpoint-Spam-Info: AW1haW4tMjYwODA2MDAzMiBTYWx0ZWRfX5vTAXS/cCqEa pCRJwKe7lfPbSGhjR7iGmuBtIC98Dyox7lCRSH/Q9QgZQjN0PmQ3CUJcuEZ9+YgOgZJ8gSQ1Jtc bOMQU/12+zotOUN7cytZxpIegxmlHgg= X-Proofpoint-ORIG-GUID: NQUYS9lGbFemW86eTSthjeW-2oF6xPOi X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA2MDAzMiBTYWx0ZWRfX5XyjqdhsDSKI ugR/UiEU8mPN9u51uuikbCyyuclrOT1kinrYR9cl+NIiyO1fSZjmszLlWsZ9ShCeVwmyQgArwrZ 5w1oH/r312AWNb8sxCEV5bGTMipiAe3Sp6t5fREjY4vueH3D2PcXVbzTBwvSUy65SP8s73lXXy5 fyLvTSuRV78fqibZ7CYUelXvT+6S+tzihyltZP0pjUWztitZJALDWA2ihQY4is01sWp1WoxwZ6x Z6/VLjeZxQkv2HBez0XAv0PkKbl20s6BfsoRXQa7JE4S7BmfESWTkaFwk7rH6bg99a5K/5gNH8u 8MCcbCnoYK6t9t/SAit9IshTbTyh5/fh760+uY/20mVMzU0zW4SkaLqj3KpCzdalZIm1pLpv4/4 jJOl7n5r1RhVLFgvpCq6dlAJRmSM2Vt5BfCD3xhVv/jCQEzxv7Bvq/cQM1LhestcnNEPBXEtrkF MakZPz7D+Qdjc1uQusg== 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 spamscore=0 malwarescore=0 priorityscore=1501 impostorscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 phishscore=0 suspectscore=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