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Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

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Pull RCU updates from Paul E. McKenney:

 - Miscellaneous fixes, perhaps most notably removing obsolete
   code whose only purpose in life was to gather information for
   the now-removed RCU debugfs facility.  Other notable changes
   include removing NO_HZ_FULL_ALL in favor of the nohz_full kernel
   boot parameter, minor optimizations for expedited grace periods,
   some added tracing, creating an RCU-specific workqueue using Tejun's
   new WQ_MEM_RECLAIM flag, and several cleanups to code and comments.

 - SRCU cleanups and optimizations.

 - Torture-test updates, perhaps most notably the adding of ARMv8
   support, but also including numerous cleanups and usability fixes.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2018-03-11 10:42:16 +01:00
parent cdb06e9d8f 338c46403f
commit c4fb5f3700
25 changed files with 238 additions and 242 deletions
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10
kernel/time/Kconfig
View File

@@ -113,16 +113,6 @@ config NO_HZ_FULL
endchoice
config NO_HZ_FULL_ALL
bool "Full dynticks system on all CPUs by default (except CPU 0)"
depends on NO_HZ_FULL
help
If the user doesn't pass the nohz_full boot option to
define the range of full dynticks CPUs, consider that all
CPUs in the system are full dynticks by default.
Note the boot CPU will still be kept outside the range to
handle the timekeeping duty.
config NO_HZ
bool "Old Idle dynticks config"
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS

22
kernel/time/tick-sched.c
View File

@@ -405,30 +405,12 @@ static int tick_nohz_cpu_down(unsigned int cpu)
return 0;
}
static int tick_nohz_init_all(void)
{
int err = -1;
#ifdef CONFIG_NO_HZ_FULL_ALL
if (!alloc_cpumask_var(&tick_nohz_full_mask, GFP_KERNEL)) {
WARN(1, "NO_HZ: Can't allocate full dynticks cpumask\n");
return err;
}
err = 0;
cpumask_setall(tick_nohz_full_mask);
tick_nohz_full_running = true;
#endif
return err;
}
void __init tick_nohz_init(void)
{
int cpu, ret;
if (!tick_nohz_full_running) {
if (tick_nohz_init_all() < 0)
return;
}
if (!tick_nohz_full_running)
return;
/*
* Full dynticks uses irq work to drive the tick rescheduling on safe