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Merge branch 'sched/cputime' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into sched/core

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Pull cputime changes from Frederic Weisbecker:

  * Generalize exception handling

  * Fix race in context tracking state restore on return from exception
    and irq exit kernel preemption

  * Fix cputime scaling in full dynticks accounting dynamic off-case

  * Fix default Kconfig value

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
2013-03-08 16:41:22 +01:00
parent 27b4b9319a 8b43876643
commit 4e3da46797
10 changed files with 163 additions and 133 deletions
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include/linux/context_tracking.h
+22 -2
View File
@@ -1,9 +1,9 @@
#ifndef _LINUX_CONTEXT_TRACKING_H
#define _LINUX_CONTEXT_TRACKING_H
#ifdef CONFIG_CONTEXT_TRACKING
#include <linux/sched.h>
#include <linux/percpu.h>
#include <asm/ptrace.h>
struct context_tracking {
/*
@@ -13,12 +13,13 @@ struct context_tracking {
* may be further optimized using static keys.
*/
bool active;
enum {
enum ctx_state {
IN_KERNEL = 0,
IN_USER,
} state;
};
#ifdef CONFIG_CONTEXT_TRACKING
DECLARE_PER_CPU(struct context_tracking, context_tracking);
static inline bool context_tracking_in_user(void)
@@ -33,12 +34,31 @@ static inline bool context_tracking_active(void)
extern void user_enter(void);
extern void user_exit(void);
static inline enum ctx_state exception_enter(void)
{
enum ctx_state prev_ctx;
prev_ctx = this_cpu_read(context_tracking.state);
user_exit();
return prev_ctx;
}
static inline void exception_exit(enum ctx_state prev_ctx)
{
if (prev_ctx == IN_USER)
user_enter();
}
extern void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next);
#else
static inline bool context_tracking_in_user(void) { return false; }
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline enum ctx_state exception_enter(void) { return 0; }
static inline void exception_exit(enum ctx_state prev_ctx) { }
static inline void context_tracking_task_switch(struct task_struct *prev,
struct task_struct *next) { }
#endif /* !CONFIG_CONTEXT_TRACKING */
include/linux/sched.h
+2 -2
View File
@@ -558,7 +558,7 @@ struct signal_struct {
cputime_t utime, stime, cutime, cstime;
cputime_t gtime;
cputime_t cgtime;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
struct cputime prev_cputime;
#endif
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
@@ -1158,7 +1158,7 @@ struct task_struct {
cputime_t utime, stime, utimescaled, stimescaled;
cputime_t gtime;
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
struct cputime prev_cputime;
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN