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[POWERPC] Fix hardware IRQ time accounting problem. 

The commit fa13a5a1f2 (sched: restore
deterministic CPU accounting on powerpc), unconditionally calls
update_process_tick() in system context.  In the deterministic
accounting case this is the correct thing to do.  However, in the
non-deterministic accounting case we need to not do this, since doing
this results in the time accounted as hardware irq time being
artificially elevated.

Also this collapses 2 consecutive '#ifdef CONFIG_VIRT_CPU_ACCOUNTING'
checks in time.h into one for neatness.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Tony Breeds 2007-12-04 16:51:44 +11:00 committed by Paul Mackerras
parent 7e1fb765c6
commit 81a3843f97
2 changed files with 3 additions and 7 deletions
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2
arch/powerpc/kernel/process.c
View File

@ -350,7 +350,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
local_irq_save(flags); local_irq_save(flags);
account_system_vtime(current); account_system_vtime(current);
account_process_tick(current, 0); account_process_vtime(current);
calculate_steal_time(); calculate_steal_time();
last = _switch(old_thread, new_thread); last = _switch(old_thread, new_thread);

8
include/asm-powerpc/time.h
View File

@ -237,18 +237,14 @@ struct cpu_usage {
DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
extern void account_process_vtime(struct task_struct *tsk);
#else
#define account_process_vtime(tsk) do { } while (0)
#endif
#if defined(CONFIG_VIRT_CPU_ACCOUNTING) #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
extern void calculate_steal_time(void); extern void calculate_steal_time(void);
extern void snapshot_timebases(void); extern void snapshot_timebases(void);
#define account_process_vtime(tsk) account_process_tick(tsk, 0)
#else #else
#define calculate_steal_time() do { } while (0) #define calculate_steal_time() do { } while (0)
#define snapshot_timebases() do { } while (0) #define snapshot_timebases() do { } while (0)
#define account_process_vtime(tsk) do { } while (0)
#endif #endif
extern void secondary_cpu_time_init(void); extern void secondary_cpu_time_init(void);