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Process scheduling changes - adapted from FreeBSD 1.1.5. Basically,

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charge scheduling CPU of child process to the parent and have child
inherit scheduling CPU from parent on fork. Makes a **big** difference
in the feel of the system to interactive users.

Submitted by:	John Dyson
This commit is contained in:
David Greenman 1994-08-06 07:15:04 +00:00
parent ee4834308a
commit 0d2afceedd
2 changed files with 12 additions and 2 deletions
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6
sys/kern/kern_exit.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_exit.c 8.7 (Berkeley) 2/12/94
* $Id$
* $Id: kern_exit.c,v 1.3 1994/08/02 07:41:59 davidg Exp $
*/
#include <sys/param.h>
@ -358,6 +358,10 @@ wait1(q, uap, retval)
continue;
nfound++;
if (p->p_stat == SZOMB) {
/* charge childs scheduling cpu usage to parent */
if( curproc->p_pid != 1)
curproc->p_estcpu += p->p_estcpu;
retval[0] = p->p_pid;
#ifdef COMPAT_43
if (uap->compat)

8
sys/kern/kern_fork.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_fork.c 8.6 (Berkeley) 4/8/94
* $Id$
* $Id: kern_fork.c,v 1.3 1994/08/02 07:42:00 davidg Exp $
*/
#include <sys/param.h>
@ -261,11 +261,17 @@ fork1(p1, isvfork, retval)
}
#endif
/*
* set priority of child to be that of parent
*/
p2->p_estcpu = p1->p_estcpu;
/*
* This begins the section where we must prevent the parent
* from being swapped.
*/
p1->p_flag |= P_NOSWAP;
/*
* Set return values for child before vm_fork,
* so they can be copied to child stack.