diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-19 09:58:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-21 07:42:23 +0200 |
| commit | a0a93e3e6e1e8c35d1d6cf624f2f74a976ab43d5 (patch) | |
| tree | 6497351c755cdaab03d336bbe8b90f6d17b0f56d /kernel/sched/core.c | |
| parent | 80495c708490eccbd5a1e8e934a674c93df1b9d8 (diff) | |
Revert "sched/core: Optimize SCHED_SMT"
This reverts commit 1b568f0aabf280555125bc7cefc08321ff0ebaba.
For the 4.9 kernel tree, this patch causes scheduler regressions. It is
fixed in newer kernels with a large number of individual patches, the
sum of which is too big for the stable kernel tree.
Ingo recommended just reverting the single patch for this tree, as it's
much simpler.
Reported-by: Ben Guthro <ben@guthro.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 692c948ae333..737381d601e6 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7422,22 +7422,6 @@ int sched_cpu_dying(unsigned int cpu) } #endif -#ifdef CONFIG_SCHED_SMT -DEFINE_STATIC_KEY_FALSE(sched_smt_present); - -static void sched_init_smt(void) -{ - /* - * We've enumerated all CPUs and will assume that if any CPU - * has SMT siblings, CPU0 will too. - */ - if (cpumask_weight(cpu_smt_mask(0)) > 1) - static_branch_enable(&sched_smt_present); -} -#else -static inline void sched_init_smt(void) { } -#endif - void __init sched_init_smp(void) { cpumask_var_t non_isolated_cpus; @@ -7467,9 +7451,6 @@ void __init sched_init_smp(void) init_sched_rt_class(); init_sched_dl_class(); - - sched_init_smt(); - sched_smp_initialized = true; } |