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Stop the mfs from trying to swap out crucial bits of the mfs

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as this can lead to deadlock.
Submitted by: Mat dillon <dillon@freebsd.org>
This commit is contained in:
Julian Elischer 1999-03-12 00:44:03 +00:00
parent 93263596ac
commit 51df594922
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=44675
2 changed files with 9 additions and 9 deletions
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14
sys/ufs/mfs/mfs_vfsops.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)mfs_vfsops.c 8.11 (Berkeley) 6/19/95
* $Id: mfs_vfsops.c,v 1.55 1999/01/21 09:24:46 dillon Exp $
* $Id: mfs_vfsops.c,v 1.56 1999/01/28 00:57:54 dillon Exp $
*/
@ -396,13 +396,13 @@ mfs_start(mp, flags, p)
register int gotsig = 0;
/*
* Must set P_SYSTEM to prevent system from trying to kill
* this process. What happens is that the process is unkillable,
* and the swapper loops trying to continuously kill it. Nor
* can we swap out this process - not unless you want a deadlock,
* anyway.
* We must set P_NOSWAP to prevent the system from trying to swap
* out or kill ( when swap space is low, see vm/pageout.c ) the
* process. A deadlock can occur if the process is swapped out,
* and the system can loop trying to kill the unkillable ( while
* references exist ) MFS process when swap space is low.
*/
curproc->p_flag |= P_SYSTEM;
curproc->p_flag |= P_NOSWAP;
while (mfsp->mfs_active) {
int s;

4
sys/vm/vm_pageout.c
View File

@ -65,7 +65,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_pageout.c,v 1.136 1999/02/08 00:37:36 dillon Exp $
* $Id: vm_pageout.c,v 1.138 1999/02/19 19:14:48 luoqi Exp $
*/
/*
@ -1144,7 +1144,7 @@ rescan0:
/*
* if this is a system process, skip it
*/
if ((p->p_flag & P_SYSTEM) || (p->p_pid == 1) ||
if ((p->p_flag & (P_SYSTEM|P_NOSWAP)) || (p->p_pid == 1) ||
((p->p_pid < 48) && (vm_swap_size != 0))) {
continue;
}