lkml.org 
[lkml]   [2006]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH v2 04/07] cpuset memory spread page cache implementation and hooks
From: Paul Jackson <pj@sgi.com>

Change the page cache allocation calls to support cpuset memory
spreading.

See the previous patch, cpuset_mem_spread, for an explanation
of cpuset memory spreading.

On systems without cpusets configured in the kernel, this is
no change.

On systems with cpusets configured in the kernel, but the
"memory_spread" cpuset option not enabled for the current tasks
cpuset, this adds a call to a cpuset routine and failed bit
test of the processor state flag PF_SPREAD_PAGE.

On tasks in cpusets with "memory_spread" enabled, this adds
a call to a cpuset routine that computes which of the tasks
mems_allowed nodes should be preferred for this allocation.

If memory spreading applies to a particular allocation, then
any other NUMA mempolicy does not apply.

Signed-off-by: Paul Jackson

---

include/linux/pagemap.h | 5 +++++
mm/filemap.c | 23 +++++++++++++++++++++++
2 files changed, 28 insertions(+)

--- v2.6.16-rc2.orig/include/linux/pagemap.h 2006-02-08 22:46:56.000000000 -0800
+++ v2.6.16-rc2/include/linux/pagemap.h 2006-02-08 22:47:04.000000000 -0800
@@ -51,6 +51,10 @@ static inline void mapping_set_gfp_mask(
#define page_cache_release(page) put_page(page)
void release_pages(struct page **pages, int nr, int cold);

+#ifdef CONFIG_NUMA
+extern struct page *page_cache_alloc(struct address_space *x);
+extern struct page *page_cache_alloc_cold(struct address_space *x);
+#else
static inline struct page *page_cache_alloc(struct address_space *x)
{
return alloc_pages(mapping_gfp_mask(x), 0);
@@ -60,6 +64,7 @@ static inline struct page *page_cache_al
{
return alloc_pages(mapping_gfp_mask(x)|__GFP_COLD, 0);
}
+#endif

typedef int filler_t(void *, struct page *);

--- v2.6.16-rc2.orig/mm/filemap.c 2006-02-08 22:46:56.000000000 -0800
+++ v2.6.16-rc2/mm/filemap.c 2006-02-08 22:47:04.000000000 -0800
@@ -30,6 +30,7 @@
#include <linux/blkdev.h>
#include <linux/security.h>
#include <linux/syscalls.h>
+#include <linux/cpuset.h>
#include "filemap.h"
/*
* FIXME: remove all knowledge of the buffer layer from the core VM
@@ -425,6 +426,28 @@ int add_to_page_cache_lru(struct page *p
return ret;
}

+#ifdef CONFIG_NUMA
+struct page *page_cache_alloc(struct address_space *x)
+{
+ if (cpuset_do_page_mem_spread()) {
+ int n = cpuset_mem_spread_node();
+ return alloc_pages_node(n, mapping_gfp_mask(x), 0);
+ }
+ return alloc_pages(mapping_gfp_mask(x), 0);
+}
+EXPORT_SYMBOL(page_cache_alloc);
+
+struct page *page_cache_alloc_cold(struct address_space *x)
+{
+ if (cpuset_do_page_mem_spread()) {
+ int n = cpuset_mem_spread_node();
+ return alloc_pages_node(n, mapping_gfp_mask(x)|__GFP_COLD, 0);
+ }
+ return alloc_pages(mapping_gfp_mask(x)|__GFP_COLD, 0);
+}
+EXPORT_SYMBOL(page_cache_alloc_cold);
+#endif
+
/*
* In order to wait for pages to become available there must be
* waitqueues associated with pages. By using a hash table of
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.650.933.1373
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-02-09 19:59    [W:0.055 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site