Christoph Lameter a écrit :
On Wed, 21 Sep 2005, David S. Miller wrote:
From: Christoph Lameter <[email protected]>
Date: Wed, 21 Sep 2005 15:43:29 -0700 (PDT)
Maybe we better introduce vmalloc_node() instead of improvising this for
several subsystems? The e1000 driver has similar issues.
I agree.
I did an implementation in June.
See http://marc.theaimsgroup.com/?l=linux-mm&m=111766643127530&w=2
Not sure if this will fit the bill. Never really tested it.
Maybe this simpler patch has more chances to be accepted ?
Thank you
[NUMA]
- Adds a vmalloc_node() function : A simple wrapper around vmalloc() to
allocate memory from a preferred node.
This NUMA aware variant will be used by ip_tables and various network drivers.
Signed-off-by: Eric Dumazet <[email protected]>
--- linux-2.6.14-rc2/include/linux/vmalloc.h 2005-09-20 05:00:41.000000000 +0200
+++ linux-2.6.14-rc2-ed/include/linux/vmalloc.h 2005-09-22 11:34:55.000000000 +0200
@@ -1,6 +1,7 @@
#ifndef _LINUX_VMALLOC_H
#define _LINUX_VMALLOC_H
+#include <linux/config.h> /* vmalloc_node() needs CONFIG_ options */
#include <linux/spinlock.h>
#include <asm/page.h> /* pgprot_t */
@@ -32,6 +33,14 @@
* Highlevel APIs for driver use
*/
extern void *vmalloc(unsigned long size);
+#ifdef CONFIG_NUMA
+extern void *vmalloc_node(unsigned long size, int node);
+#else
+static inline void *vmalloc_node(unsigned long size, int node)
+{
+ return vmalloc(size);
+}
+#endif
extern void *vmalloc_exec(unsigned long size);
extern void *vmalloc_32(unsigned long size);
extern void *__vmalloc(unsigned long size, unsigned int __nocast gfp_mask, pgprot_t prot);
--- linux-2.6.14-rc2/mm/vmalloc.c 2005-09-20 05:00:41.000000000 +0200
+++ linux-2.6.14-rc2-ed/mm/vmalloc.c 2005-09-22 11:55:19.000000000 +0200
@@ -19,6 +19,9 @@
#include <asm/uaccess.h>
#include <asm/tlbflush.h>
+#ifdef CONFIG_NUMA
+#include <linux/mempolicy.h>
+#endif
DEFINE_RWLOCK(vmlist_lock);
struct vm_struct *vmlist;
@@ -471,7 +474,7 @@
* Allocate enough pages to cover @size from the page level
* allocator and map them into contiguous kernel virtual space.
*
- * For tight cotrol over page level allocator and protection flags
+ * For tight control over page level allocator and protection flags
* use __vmalloc() instead.
*/
void *vmalloc(unsigned long size)
@@ -481,6 +484,40 @@
EXPORT_SYMBOL(vmalloc);
+#ifdef CONFIG_NUMA
+/**
+ * vmalloc_node - allocate virtually contiguous memory
+ *
+ * @size: allocation size
+ * @node: preferred node
+ *
+ * This vmalloc variant try to allocate memory from a preferred node.
+ */
+void *vmalloc_node(unsigned long size, int node)
+{
+ void *result;
+ struct mempolicy *oldpol = current->mempolicy;
+ mm_segment_t oldfs = get_fs();
+ DECLARE_BITMAP(prefnode, MAX_NUMNODES);
+
+ mpol_get(oldpol);
+ bitmap_zero(prefnode, MAX_NUMNODES);
+ set_bit(node, prefnode);
+
+ set_fs(KERNEL_DS);
+ sys_set_mempolicy(MPOL_PREFERRED, prefnode, MAX_NUMNODES);
+ set_fs(oldfs);
+
+ result = vmalloc(size);
+
+ mpol_free(current->mempolicy);
+ current->mempolicy = oldpol;
+ return result;
+}
+
+EXPORT_SYMBOL(vmalloc_node);
+#endif
+
#ifndef PAGE_KERNEL_EXEC
# define PAGE_KERNEL_EXEC PAGE_KERNEL
#endif
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