timers/migration: Handle heterogenous CPU capacities
Status from this message: The following commit has been merged into the timers/urgent branch of tip:
Get series with b4
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Patches in v1 Applied
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/6 | timers/migration: Fix another hotplug activation racekernel/ | +29 | 0 replies | |
| 2/6 | timers/migration: Abstract out hierarchy to prepare for CPU capacity awarenesskernel/ kernel/ | +72 | 0 replies | |
| 3/6 | timers/migration: Track CPUs in a hierarchykernel/ kernel/ | +21 | 0 replies | |
| 4/6 | timers/migration: Split per-capacity hierarchieskernel/ kernel/ | +101 | 0 replies | |
| 5/6 | timers/migration: Handle capacity in connect tracepointsinclude/ kernel/ | +16 | 0 replies | |
| 6/6 | scripts/timers: Add timer_migration_tree.pyscripts/ | +122 | 0 replies |
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Cover letter [PATCH 0/6] timers/migration: Handle heterogenous CPU capacities
Hi,
This is a late follow-up after:
https://lore.kernel.org/lkml/[email protected]/
To summarize, heterogenous capacity CPUs migrate their timers indifferently between big and little CPUs. And this happens to be often migrated to big CPUs, increasing their idle target residency.
Thomas proposed to isolate the hierarchy between big and little CPUs. So here is a try. Note I haven't tested on real heterogenous hardware so if you have it, please test it!
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
timers/core
HEAD: f0a87af6dab6f3a6dd8a603a2b9d7dcc86fd50e4
Thanks,
Frederic
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Frederic Weisbecker (6):
timers/migration: Fix another hotplug activation race timers/migration: Abstract out hierarchy to prepare for CPU capacity awareness timers/migration: Track CPUs in a hierarchy
timers/migration: Split per-capacity hierarchies timers/migration: Handle capacity in connect tracepoints scripts/timers: Add timer_migration_tree.py
include/trace/events/timer_migration.h | 24 ++-- kernel/time/timer_migration.c | 246 ++++++++++++++++++++++++--------- kernel/time/timer_migration.h | 19 +++ scripts/timer_migration_tree.py | 122 ++++++++++++++++ 4 files changed, 337 insertions(+), 74 deletions(-)