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Commit 0f59cc4a authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

[PATCH] simplify k_getrusage() 



Factor out common code for different RUSAGE_xxx cases.

Don't take ->sighand->siglock in RUSAGE_SELF case, suggested by Ravikiran G
Thirumalai <kiran@scalex86.org>.

Signed-off-by: default avatarOleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 86f91d36

kernel/sys.c

+11 −18
Original line number Diff line number Diff line
@@ -1692,7 +1692,10 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) 
	if (unlikely(!p->signal))

		return;



	utime = stime = cputime_zero;



	switch (who) {

		case RUSAGE_BOTH:

		case RUSAGE_CHILDREN:

			spin_lock_irqsave(&p->sighand->siglock, flags);

			utime = p->signal->cutime;
@@ -1702,22 +1705,11 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) 
			r->ru_minflt = p->signal->cmin_flt;

			r->ru_majflt = p->signal->cmaj_flt;

			spin_unlock_irqrestore(&p->sighand->siglock, flags);

			cputime_to_timeval(utime, &r->ru_utime);

			cputime_to_timeval(stime, &r->ru_stime);



			if (who == RUSAGE_CHILDREN)

				break;



		case RUSAGE_SELF:

			spin_lock_irqsave(&p->sighand->siglock, flags);

			utime = stime = cputime_zero;

			goto sum_group;

		case RUSAGE_BOTH:

			spin_lock_irqsave(&p->sighand->siglock, flags);

			utime = p->signal->cutime;

			stime = p->signal->cstime;

			r->ru_nvcsw = p->signal->cnvcsw;

			r->ru_nivcsw = p->signal->cnivcsw;

			r->ru_minflt = p->signal->cmin_flt;

			r->ru_majflt = p->signal->cmaj_flt;

		sum_group:

			utime = cputime_add(utime, p->signal->utime);

			stime = cputime_add(stime, p->signal->stime);

			r->ru_nvcsw += p->signal->nvcsw;
@@ -1734,13 +1726,14 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) 
				r->ru_majflt += t->maj_flt;

				t = next_thread(t);

			} while (t != p);

			spin_unlock_irqrestore(&p->sighand->siglock, flags);

			cputime_to_timeval(utime, &r->ru_utime);

			cputime_to_timeval(stime, &r->ru_stime);

			break;



		default:

			BUG();

	}



	cputime_to_timeval(utime, &r->ru_utime);

	cputime_to_timeval(stime, &r->ru_stime);

}



int getrusage(struct task_struct *p, int who, struct rusage __user *ru)