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Add the vm.exec_map_entries tunable and read-only sysctl, which controls

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the number of entries in exec_map (maximum number of simultaneous execs
that can be handled by the kernel).  The default value of 16 is
insufficient on heavily loaded machines (particularly SMP machines), and
if it is exceeded then executing further processes will generate a SIGABRT.

This is a workaround until a better solution can be implemented.

Reviewed by:	alc
MFC after:	3 days
This commit is contained in:
Kris Kennaway 2005-04-25 19:22:05 +00:00
parent 0eb958a2b7
commit f5fca0d8be
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=145530
1 changed files with 7 additions and 1 deletions
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8
sys/vm/vm_init.c
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@ -70,6 +70,7 @@ __FBSDID("$FreeBSD$");
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/selinfo.h>
#include <sys/pipe.h>
@ -87,6 +88,11 @@ __FBSDID("$FreeBSD$");
long physmem;
static int exec_map_entries = 16;
TUNABLE_INT("vm.exec_map_entries", &exec_map_entries);
SYSCTL_INT(_vm, OID_AUTO, exec_map_entries, CTLFLAG_RD, &exec_map_entries, 0,
"Maximum number of simultaneous execs");
/*
* System initialization
*/
@ -188,7 +194,7 @@ vm_ksubmap_init(struct kva_md_info *kmi)
(nswbuf*MAXPHYS));
pager_map->system_map = 1;
exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr,
(16*(ARG_MAX+(PAGE_SIZE*3))));
(exec_map_entries*(ARG_MAX+(PAGE_SIZE*3))));
pipe_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, maxpipekva);
/*