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Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull NOHZ updates from Thomas Gleixner:
 "A few updates to the nohz infrastructure:

   - recursion protection for context tracking

   - make the TIF_NOHZ inheritance smarter

   - isolate cpus which belong to the NOHZ full set"

* 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  nohz: Set isolcpus when nohz_full is set
  nohz: Add tick_nohz_full_add_cpus_to() API
  context_tracking: Inherit TIF_NOHZ through forks instead of context switches
  context_tracking: Protect against recursion
This commit is contained in:
Linus Torvalds
2015-06-22 19:20:04 -07:00
parent 43224b96af 8cb9764fc8
commit 3a95398f54
6 changed files with 59 additions and 33 deletions
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4
kernel/sched/core.c
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@@ -2374,7 +2374,6 @@ context_switch(struct rq *rq, struct task_struct *prev,
*/
spin_release(&rq->lock.dep_map, 1, _THIS_IP_);
context_tracking_task_switch(prev, next);
/* Here we just switch the register state and the stack. */
switch_to(prev, next, prev);
barrier();
@@ -7068,6 +7067,9 @@ void __init sched_init_smp(void)
alloc_cpumask_var(&non_isolated_cpus, GFP_KERNEL);
alloc_cpumask_var(&fallback_doms, GFP_KERNEL);
/* nohz_full won't take effect without isolating the cpus. */
tick_nohz_full_add_cpus_to(cpu_isolated_map);
sched_init_numa();
/*