linux-kernel - [PATCH 0/3] arm64: topology: Improve cpuinfo_avg

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Message-ID: <20251104075544.3243606-1-yubowen8@huawei.com>
Date: Tue, 4 Nov 2025 15:55:41 +0800
From: Bowen Yu <yubowen8@...wei.com>
To: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<catalin.marinas@....com>, <will@...nel.org>, <beata.michalska@....com>,
	<ptsm@...ux.microsoft.com>, <linuxarm@...wei.com>,
	<jonathan.cameron@...wei.com>
CC: <zhanjie9@...ilicon.com>, <prime.zeng@...ilicon.com>,
	<wanghuiqiang@...wei.com>, <xuwei5@...wei.com>, <zhenglifeng1@...wei.com>,
	<yubowen8@...wei.com>, <zhangpengjie2@...wei.com>
Subject: [PATCH 0/3] arm64: topology: Improve cpuinfo_avg_freq for ARM64

This series addresses several issues in CPU avgfreq reporting:

Patch 1:
- Implements direct frequency calculation using AMU counters:
  freq = (core_cycles_delta * timer_freq) / (const_cycles_delta 
  * HZ_PER_KHZ)
- Eliminates precision loss from SCHED_CAPACITY_SHIFT bit-shifting

Patch 2:
- Resolves unreliable cpuinfo_avg_freq behavior during idle periods
- Replaces invalid returns with governor's current frequency as fallback
  value when all CPUs in policy are idle

Patch 3:
- Removes redundant housekeeping_cpu() check

Bowen Yu (3):
  arm64: topology: Improve AMU-based frequency calculation
  arm64: topology: Use current freq in governor for idle cpus in
    cpuinfo_avg_freq
  arm64: topology: Remove redundant housekeeping_cpu() checks in
    arch_freq_get_on_cpu

 arch/arm64/kernel/topology.c | 40 +++++++++++++++---------------------
 1 file changed, 17 insertions(+), 23 deletions(-)

-- 
2.33.0