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

sched/cputime: Convert task/group cputime to nsecs

Browse Source 
Now that most cputime readers use the transition API which return the
task cputime in old style cputime_t, we can safely store the cputime in
nsecs. This will eventually make cputime statistics less opaque and more
granular. Back and forth convertions between cputime_t and nsecs in order
to deal with cputime_t random granularity won't be needed anymore.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Link: http://lkml.kernel.org/r/1485832191-26889-8-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker
2017-01-31 04:09:23 +01:00
committed by Ingo Molnar
parent a1cecf2ba7
commit 5613fda9a5
12 changed files with 89 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
include/linux/sched.h
View File

@@ -585,8 +585,8 @@ struct cpu_itimer {
*/
struct prev_cputime {
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
cputime_t utime;
cputime_t stime;
u64 utime;
u64 stime;
raw_spinlock_t lock;
#endif
};
@@ -601,8 +601,8 @@ static inline void prev_cputime_init(struct prev_cputime *prev)
/**
* struct task_cputime - collected CPU time counts
* @utime: time spent in user mode, in &cputime_t units
* @stime: time spent in kernel mode, in &cputime_t units
* @utime: time spent in user mode, in nanoseconds
* @stime: time spent in kernel mode, in nanoseconds
* @sum_exec_runtime: total time spent on the CPU, in nanoseconds
*
* This structure groups together three kinds of CPU time that are tracked for
@@ -610,8 +610,8 @@ static inline void prev_cputime_init(struct prev_cputime *prev)
* these counts together and treat all three of them in parallel.
*/
struct task_cputime {
cputime_t utime;
cputime_t stime;
u64 utime;
u64 stime;
unsigned long long sum_exec_runtime;
};
@@ -780,7 +780,7 @@ struct signal_struct {
* in __exit_signal, except for the group leader.
*/
seqlock_t stats_lock;
cputime_t utime, stime, cutime, cstime;
u64 utime, stime, cutime, cstime;
u64 gtime;
u64 cgtime;
struct prev_cputime prev_cputime;
@@ -1661,9 +1661,9 @@ struct task_struct {
int __user *set_child_tid; /* CLONE_CHILD_SETTID */
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
cputime_t utime, stime;
u64 utime, stime;
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
cputime_t utimescaled, stimescaled;
u64 utimescaled, stimescaled;
#endif
u64 gtime;
struct prev_cputime prev_cputime;
@@ -2260,11 +2260,11 @@ struct task_struct *try_get_task_struct(struct task_struct **ptask);
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
extern void task_cputime(struct task_struct *t,
cputime_t *utime, cputime_t *stime);
u64 *utime, u64 *stime);
extern u64 task_gtime(struct task_struct *t);
#else
static inline void task_cputime(struct task_struct *t,
cputime_t *utime, cputime_t *stime)
u64 *utime, u64 *stime)
{
*utime = t->utime;
*stime = t->stime;
@@ -2278,16 +2278,16 @@ static inline u64 task_gtime(struct task_struct *t)
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
static inline void task_cputime_scaled(struct task_struct *t,
cputime_t *utimescaled,
cputime_t *stimescaled)
u64 *utimescaled,
u64 *stimescaled)
{
*utimescaled = t->utimescaled;
*stimescaled = t->stimescaled;
}
#else
static inline void task_cputime_scaled(struct task_struct *t,
cputime_t *utimescaled,
cputime_t *stimescaled)
u64 *utimescaled,
u64 *stimescaled)
{
task_cputime(t, utimescaled, stimescaled);
}
@@ -2296,18 +2296,26 @@ static inline void task_cputime_scaled(struct task_struct *t,
static inline void task_cputime_t(struct task_struct *t,
cputime_t *utime, cputime_t *stime)
{
task_cputime(t, utime, stime);
u64 ut, st;
task_cputime(t, &ut, &st);
*utime = nsecs_to_cputime(ut);
*stime = nsecs_to_cputime(st);
}
static inline void task_cputime_t_scaled(struct task_struct *t,
cputime_t *utimescaled,
cputime_t *stimescaled)
{
task_cputime_scaled(t, utimescaled, stimescaled);
u64 ut, st;
task_cputime_scaled(t, &ut, &st);
*utimescaled = nsecs_to_cputime(ut);
*stimescaled = nsecs_to_cputime(st);
}
extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
extern void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st);
extern void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st);
/*
* Per process flags
@@ -3522,9 +3530,14 @@ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime_t *times);
static inline void thread_group_cputime_t(struct task_struct *tsk,
struct task_cputime_t *times)
struct task_cputime_t *cputime)
{
thread_group_cputime(tsk, (struct task_cputime *)times);
struct task_cputime times;
thread_group_cputime(tsk, &times);
cputime->utime = nsecs_to_cputime(times.utime);
cputime->stime = nsecs_to_cputime(times.stime);
cputime->sum_exec_runtime = times.sum_exec_runtime;
}
/*