xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

nohz_full: Add per-CPU idle-state tracking

Browse Source 
This commit adds the code that updates the rcu_dyntick structure's
new fields to track the per-CPU idle state based on interrupts and
transitions into and out of the idle loop (NMIs are ignored because NMI
handlers cannot cleanly read out the time anyway).  This code is similar
to the code that maintains RCU's idea of per-CPU idleness, but differs
in that RCU treats CPUs running in user mode as idle, where this new
code does not.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney
2013-06-21 13:00:57 -07:00
parent 2333210b26
commit eb348b8982
3 changed files with 85 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/rcutree.c
View File

@@ -431,6 +431,7 @@ void rcu_idle_enter(void)
local_irq_save(flags);
rcu_eqs_enter(false);
rcu_sysidle_enter(&__get_cpu_var(rcu_dynticks), 0);
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(rcu_idle_enter);
@@ -481,6 +482,7 @@ void rcu_irq_exit(void)
trace_rcu_dyntick(TPS("--="), oldval, rdtp->dynticks_nesting);
else
rcu_eqs_enter_common(rdtp, oldval, true);
rcu_sysidle_enter(rdtp, 1);
local_irq_restore(flags);
}
@@ -549,6 +551,7 @@ void rcu_idle_exit(void)
local_irq_save(flags);
rcu_eqs_exit(false);
rcu_sysidle_exit(&__get_cpu_var(rcu_dynticks), 0);
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(rcu_idle_exit);
@@ -600,6 +603,7 @@ void rcu_irq_enter(void)
trace_rcu_dyntick(TPS("++="), oldval, rdtp->dynticks_nesting);
else
rcu_eqs_exit_common(rdtp, oldval, true);
rcu_sysidle_exit(rdtp, 1);
local_irq_restore(flags);
}