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When KVA is exhausted, try the vm_lowmem event for the last time before

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panicing. This helps a lot in ZFS stability.
This commit is contained in:
Pawel Jakub Dawidek 2007-04-05 20:52:51 +00:00
parent fcdd9721e4
commit 0f2c2ce0a3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=168395
1 changed files with 14 additions and 4 deletions
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18
sys/vm/vm_kern.c
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@ -68,6 +68,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h> /* for ticks and hz */
#include <sys/eventhandler.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
@ -81,6 +82,7 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>
vm_map_t kernel_map=0;
vm_map_t kmem_map=0;
@ -294,10 +296,18 @@ kmem_malloc(map, size, flags)
vm_map_lock(map);
if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
vm_map_unlock(map);
if ((flags & M_NOWAIT) == 0)
panic("kmem_malloc(%ld): kmem_map too small: %ld total allocated",
(long)size, (long)map->size);
return (0);
if ((flags & M_NOWAIT) == 0) {
EVENTHANDLER_INVOKE(vm_lowmem, 0);
uma_reclaim();
vm_map_lock(map);
if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
vm_map_unlock(map);
panic("kmem_malloc(%ld): kmem_map too small: %ld total allocated",
(long)size, (long)map->size);
}
} else {
return (0);
}
}
offset = addr - VM_MIN_KERNEL_ADDRESS;
vm_object_reference(kmem_object);