Commit c83e4484 authored by Jeff Dike's avatar Jeff Dike Committed by Linus Torvalds

uml: an idle system should have zero load average

The ever-vigilant users of linode.com noticed that an idle 2.6 UML has a
persistent load average of ~.4.

It turns out that because the UML timer handler processed softirqs before
actually delivering the tick, the tick was counted in the context of the idle
thread about half the time.
Signed-off-by: default avatarJeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f1adc05e
...@@ -177,6 +177,8 @@ int do_settimeofday(struct timespec *tv) ...@@ -177,6 +177,8 @@ int do_settimeofday(struct timespec *tv)
void timer_handler(int sig, union uml_pt_regs *regs) void timer_handler(int sig, union uml_pt_regs *regs)
{ {
if(current_thread->cpu == 0)
timer_irq(regs);
local_irq_disable(); local_irq_disable();
irq_enter(); irq_enter();
update_process_times(CHOOSE_MODE( update_process_times(CHOOSE_MODE(
...@@ -184,6 +186,4 @@ void timer_handler(int sig, union uml_pt_regs *regs) ...@@ -184,6 +186,4 @@ void timer_handler(int sig, union uml_pt_regs *regs)
(regs)->skas.is_user)); (regs)->skas.is_user));
irq_exit(); irq_exit();
local_irq_enable(); local_irq_enable();
if(current_thread->cpu == 0)
timer_irq(regs);
} }
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