timers/migration: Fix NUMA trees + cleanups
Status from this message: The following commit has been merged into the timers/core branch of tip:
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Patches in v1 Applied
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/6 | timers/migration: Convert "while" loops to use "for"kernel/ | +13 | 0 replies | |
| 2/6 | timers/migration: Remove locking on group connectionkernel/ | +0 | 0 replies | |
| 3/6 | timers/migration: Fix imbalanced NUMA treeskernel/ | +127 | 0 replies | |
| 4/6 | timers/migration: Assert that hotplug preparing CPU is part of stable active hierarchykernel/ | +8 | 0 replies | |
| 5/6 | timers/migration: Remove unused "cpu" parameter from tmigr_get_group()kernel/ | +2 | 0 replies | |
| 6/6 | timers/migration: Remove dead code handling idle CPU checking for remote timerskernel/ | +0 | 0 replies |
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Cover letter [PATCH 0/6] timers/migration: Fix NUMA trees + cleanups
Hi,
A while ago I found out that NUMA tree layout had flaws but I thought it was only about rare setups. Having had a closer look while thinking about the big.LITTLE handling, I realized the NUMA timer tree are actually imbalanced in many cases, except perhaps when 0-7 CPUs are lucky enough to belong to the same node, and yet up to a certain amount of CPUs.
Here is a fix proposal, plus a bunch of cleanups.
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
timers/core
HEAD: 4adecc004d35dbe8a48df3d23ed2b8cf42772716
Thanks,
Frederic
---
Frederic Weisbecker (6):
timers/migration: Convert "while" loops to use "for"
timers/migration: Remove locking on group connection
timers/migration: Fix imbalanced NUMA trees
timers/migration: Assert that hotplug preparing CPU is part of stable active hierarchy timers/migration: Remove unused "cpu" parameter from tmigr_get_group() timers/migration: Remove dead code handling idle CPU checking for remote timers
kernel/time/timer_migration.c | 279 ++++++++++++++++++++++-------------------- 1 file changed, 143 insertions(+), 136 deletions(-)