From 67d4e8403fe12592f99cf6fc51e4f33684899d6b Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Wed, 20 Apr 2011 23:35:42 +0200
Subject: Warn once when part of the kernel is lacking memory

* kern/printf.h (printf_once): New macro.
* ipc/mach_port.c (mach_port_names, mach_port_get_set_status): Warn when
returning KERN_RESOURCE_SHORTAGE.
* vm/vm_kern.c: Include printf.h.
(kmem_alloc, kmem_realloc, kmem_alloc_wired, kmem_alloc_aligned,
kmem_alloc_pageable): Warn when failing.
* vm/vm_resident.c (vm_page_grab_contiguous_pages): Warn when returning
KERN_RESOURCE_SHORTAGE.
---
 vm/vm_kern.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'vm/vm_kern.c')

diff --git a/vm/vm_kern.c b/vm/vm_kern.c
index dc7f7e4..cfa33ff 100644
--- a/vm/vm_kern.c
+++ b/vm/vm_kern.c
@@ -43,6 +43,7 @@
 #include <kern/debug.h>
 #include <kern/lock.h>
 #include <kern/thread.h>
+#include <kern/printf.h>
 #include <vm/pmap.h>
 #include <vm/vm_fault.h>
 #include <vm/vm_kern.h>
@@ -387,6 +388,7 @@ kmem_alloc(map, addrp, size)
 	kr = vm_map_find_entry(map, &addr, size, (vm_offset_t) 0,
 			       VM_OBJECT_NULL, &entry);
 	if (kr != KERN_SUCCESS) {
+		printf_once("no more room for kmem_alloc in %p\n", map);
 		vm_map_unlock(map);
 		vm_object_deallocate(object);
 		return kr;
@@ -453,6 +455,7 @@ kern_return_t kmem_realloc(map, oldaddr, oldsize, newaddrp, newsize)
 			       VM_OBJECT_NULL, &newentry);
 	if (kr != KERN_SUCCESS) {
 		vm_map_unlock(map);
+		printf_once("no more room for kmem_realloc in %p\n", map);
 		return kr;
 	}
 
@@ -537,6 +540,7 @@ kmem_alloc_wired(map, addrp, size)
 	kr = vm_map_find_entry(map, &addr, size, (vm_offset_t) 0,
 			       kernel_object, &entry);
 	if (kr != KERN_SUCCESS) {
+		printf_once("no more room for kmem_alloc_wired in %p\n", map);
 		vm_map_unlock(map);
 		return kr;
 	}
@@ -611,6 +615,7 @@ kmem_alloc_aligned(map, addrp, size)
 	kr = vm_map_find_entry(map, &addr, size, size - 1,
 			       kernel_object, &entry);
 	if (kr != KERN_SUCCESS) {
+		printf_once("no more rooom for kmem_alloc_aligned in %p\n", map);
 		vm_map_unlock(map);
 		return kr;
 	}
@@ -672,8 +677,10 @@ kmem_alloc_pageable(map, addrp, size)
 			  (vm_offset_t) 0, TRUE,
 			  VM_OBJECT_NULL, (vm_offset_t) 0, FALSE,
 			  VM_PROT_DEFAULT, VM_PROT_ALL, VM_INHERIT_DEFAULT);
-	if (kr != KERN_SUCCESS)
+	if (kr != KERN_SUCCESS) {
+		printf_once("no more room for kmem_alloc_pageable in %p\n", map);
 		return kr;
+	}
 
 	*addrp = addr;
 	return KERN_SUCCESS;
-- 
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