Re: [PATCH] Optimize sys_times for a single thread process

[Christoph Lameter]

On Thu, 19 May 2005, Oleg Nesterov wrote:

> > The thread ist needs to contain only one element which is current.
> > thread_group_empty checks for no threads.
> 
> I think that thread_group_empty() means that there are no *other*
> threads in the thread group, that means that we have only one thread.
> 
> In any case (p == next_thread(p)) == thread_group_empty(p).
> 
> But it is a very minor issue indeed, let's forget it.

No no. If you are right then you are right and I am 
wrong.

Index: linux-2.6.12-rc4/kernel/sys.c
===================================================================
--- linux-2.6.12-rc4.orig/kernel/sys.c	2005-05-19 03:23:29.000000000 +0000
+++ linux-2.6.12-rc4/kernel/sys.c	2005-05-19 14:40:32.000000000 +0000
@@ -920,7 +920,7 @@
 		cputime_t utime, stime, cutime, cstime;
 
 #ifdef CONFIG_SMP
-		if (current == next_thread(current)) {
+		if (thread_group_empty(current)) {
 			/*
 			 * Single thread case without the use of any locks.
 			 *
-
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