MacBook Pro Resume Delay

Contents:

• MacBook Pro Resume Delay
  • Problem
  • Environment
  • Initial investigation
  • Reproduction with mainline kernel
  • Finding the problematic code path
    • _cpu_up()
    • cpuhp_invoke_callback()
    • cpuhp_bringup_ap()
    • complete_ap_thread()
    • smpboot_thread_fn()
    • workqueue_online_cpu(), cacheinfo_cpu_online() & sched_cpu_activate()
  • Execution speed
    • Call counts
    • Call times
    • CPU frequency
    • Performance governor
    • intel_pstate
    • cpufreq debug
  • Speed recovery
    • User space test
    • Kernel speed test
    • thaw_processes()
    • acpi_pm_finish()
    • pm_sleep_enable_secondary_cpus()
    • arch_thaw_secondary_cpus_end()
    • cache_aps_init() / cache_cpu_init()
    • cache_disable()/cache_enable()
    • MTRR inconsistency?
    • Speed recovery end note
  • Kernel version
    • Shorter compile time
    • v6.1.104
    • v4.19.12
    • v6.16.7
    • v6.6.45
    • v6.11.11
    • v6.9.12
    • v6.8.12
    • Version summary
  • Regression bisection : 6.8.0 - 6.8.12
    • v6.8.0
    • v6.8.5-80-g59813a65b721
    • v6.8.9-116-gb6735bfe9414
    • v6.8.11-123-gfea4aea0fbc3
    • v6.8.11-308-g5e71608df742
    • v6.8.11-401-gb77620730f61
    • v6.8.11-447-g8c0a305b7603
    • v6.8.11-470-g8607fbc7bb7f
    • v6.8.11-482-gb86dcd478264
    • v6.8.11-488-gf2205e838c31
    • v6.8.11-491-g32db10471618
    • v6.8.11-493-g40503e604570
    • Implausible result:
    • retest
  • New Bisection?
    • Version summary
    • v6.7.0
  • MTRR values
    • Values on boot
    • Changes after boot
    • Changes after resume
    • Split of resume changes
    • Delay of resume changes on secondary CPUs
    • Reducing MTRR restore delay
    • Correctness of change
    • Conditional change
    • Cost of extra checks
    • Add diagnostic
    • Commit changes
    • Test on main branch
  • Patch submission
    • Subsystem tree
    • git send-email
    • b4
    • Composing reply emails
    • Publish commits
    • Publish these notes (convert to HTML)
    • Publish these notes (Upload to CloudFlare)
    • b4 prep
    • b4 send
  • Patch review
    • Test with MTRR update parallelisation patch
    • Stand by

Indices and tables

• Index

• Module Index

• Search Page