sched/debug: Optimize sched_domain sysctl generation

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Currently we unconditionally destroy all sysctl bits and regenerate
them after we've rebuild the domains (even if that rebuild is a
no-op).

And since we unconditionally (re)build the sysctl for all possible
CPUs, onlining all CPUs gets us O(n^2) time. Instead change this to
only rebuild the bits for CPUs we've actually installed new domains
on.

Reported-by: Ofer Levi(SW) <oferle@mellanox.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Peter Zijlstra 2017-08-10 17:10:26 +02:00 • committed by Ingo Molnar

parent 09e0dd8e0f

commit bbdacdfed2

3 changed files with 59 additions and 14 deletions

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68

kernel/sched/debug.c

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4

kernel/sched/sched.h

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1

kernel/sched/topology.c

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