Sep 30, 2025 · Fundamentals

How Merging cfs_rq and sched_entity Boosts Linux Scheduler Cache Hits by 31%

Google engineer Zecheng Li’s patch series merges the CFS scheduler’s cfs_rq and sched_entity structures and switches to a per‑CPU allocator, cutting LLC miss rates by up to 31% and raising kernel IPC by up to 25% on AMD and Intel platforms, with negligible regression.

CFSLinuxScheduler

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How Merging cfs_rq and sched_entity Boosts Linux Scheduler Cache Hits by 31%

Liangxu Linux

Feb 15, 2021 · Fundamentals

How Linux Implements Per‑CPU Variables: From Definition to Runtime Access

This article explains the concept of per‑CPU variables in the Linux kernel, how they are defined with DEFINE_PER_CPU, linked into the .data..percpu section, initialized during boot, and accessed at runtime via the GS register and macro expansions such as this_cpu_read_stable.

AssemblyLinuxMacro Expansion

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How Linux Implements Per‑CPU Variables: From Definition to Runtime Access