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-rw-r--r--kernel/sched.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 9a1ddb84e26d..1a5f73c1fcdc 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4179,6 +4179,65 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
4179} 4179}
4180 4180
4181/* 4181/*
4182 * Use precise platform statistics if available:
4183 */
4184#ifdef CONFIG_VIRT_CPU_ACCOUNTING
4185cputime_t task_utime(struct task_struct *p)
4186{
4187 return p->utime;
4188}
4189
4190cputime_t task_stime(struct task_struct *p)
4191{
4192 return p->stime;
4193}
4194#else
4195cputime_t task_utime(struct task_struct *p)
4196{
4197 clock_t utime = cputime_to_clock_t(p->utime),
4198 total = utime + cputime_to_clock_t(p->stime);
4199 u64 temp;
4200
4201 /*
4202 * Use CFS's precise accounting:
4203 */
4204 temp = (u64)nsec_to_clock_t(p->se.sum_exec_runtime);
4205
4206 if (total) {
4207 temp *= utime;
4208 do_div(temp, total);
4209 }
4210 utime = (clock_t)temp;
4211
4212 p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
4213 return p->prev_utime;
4214}
4215
4216cputime_t task_stime(struct task_struct *p)
4217{
4218 clock_t stime;
4219
4220 /*
4221 * Use CFS's precise accounting. (we subtract utime from
4222 * the total, to make sure the total observed by userspace
4223 * grows monotonically - apps rely on that):
4224 */
4225 stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
4226 cputime_to_clock_t(task_utime(p));
4227
4228 if (stime >= 0)
4229 p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
4230
4231 return p->prev_stime;
4232}
4233#endif
4234
4235inline cputime_t task_gtime(struct task_struct *p)
4236{
4237 return p->gtime;
4238}
4239
4240/*
4182 * This function gets called by the timer code, with HZ frequency. 4241 * This function gets called by the timer code, with HZ frequency.
4183 * We call it with interrupts disabled. 4242 * We call it with interrupts disabled.
4184 * 4243 *