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add kmem_map_free sysctl: query largest contiguous free range in kmem_map

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Suggested by:	alc
Reviewed by:	alc
MFC after:	1 week
This commit is contained in:
Andriy Gapon 2010-10-09 09:03:17 +00:00
parent 0f74b3f3ed
commit 95bb9d38b8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=213651
1 changed files with 17 additions and 0 deletions
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17
sys/kern/kern_malloc.c
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@ -207,6 +207,11 @@ SYSCTL_PROC(_vm, OID_AUTO, kmem_map_size,
CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
sysctl_kmem_map_size, "LU", "Current kmem_map allocation size");
static int sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vm, OID_AUTO, kmem_map_free,
CTLFLAG_RD | CTLTYPE_ULONG | CTLFLAG_MPSAFE, NULL, 0,
sysctl_kmem_map_free, "LU", "Largest contiguous free range in kmem_map");
/*
* The malloc_mtx protects the kmemstatistics linked list.
*/
@ -254,6 +259,18 @@ sysctl_kmem_map_size(SYSCTL_HANDLER_ARGS)
return (sysctl_handle_long(oidp, &size, 0, req));
}
static int
sysctl_kmem_map_free(SYSCTL_HANDLER_ARGS)
{
u_long size;
vm_map_lock_read(kmem_map);
size = kmem_map->root != NULL ?
kmem_map->root->max_free : kmem_map->size;
vm_map_unlock_read(kmem_map);
return (sysctl_handle_long(oidp, &size, 0, req));
}
/*
* malloc(9) uma zone separation -- sub-page buffer overruns in one
* malloc type will affect only a subset of other malloc types.