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Map lock checks not needed anymore for swapping out. We don't use

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map operations for it anymore.  Certain deadlocks should never happen
anymore.
This commit is contained in:
John Dyson 1996-04-08 03:42:01 +00:00
parent 58b248e254
commit b5cfb15fad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=15134
1 changed files with 2 additions and 12 deletions
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14
sys/vm/vm_glue.c
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@ -59,7 +59,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_glue.c,v 1.44 1996/04/03 05:23:36 dyson Exp $
* $Id: vm_glue.c,v 1.45 1996/04/07 17:39:23 bde Exp $
*/
#include "opt_ddb.h"
@ -472,6 +472,7 @@ scheduler(dummy)
struct proc *pp;
int ppri;
spl0();
loop:
while ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min) {
VM_WAIT;
@ -561,22 +562,11 @@ retry:
(p->p_slptime <= 4))
continue;
vm_map_reference(&p->p_vmspace->vm_map);
/*
* do not swapout a process that is waiting for VM
* datastructures there is a possible deadlock.
*/
if (!lock_try_write(&p->p_vmspace->vm_map.lock)) {
vm_map_deallocate(&p->p_vmspace->vm_map);
continue;
}
vm_map_unlock(&p->p_vmspace->vm_map);
/*
* If the process has been asleep for awhile and had
* most of its pages taken away already, swap it out.
*/
swapout(p);
vm_map_deallocate(&p->p_vmspace->vm_map);
didswap++;
goto retry;
}