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Subject[PATCH 2/5] 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 one failed bit test of the processor state
flag PF_MEM_SPREAD.

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 | 9 +++++++++
1 files changed, 9 insertions(+)

--- 2.6.16-rc1-mm3.orig/include/linux/pagemap.h 2006-01-31 08:55:27.238487776 -0800
+++ 2.6.16-rc1-mm3/include/linux/pagemap.h 2006-01-31 08:58:25.459267700 -0800
@@ -10,6 +10,7 @@
#include <linux/highmem.h>
#include <linux/compiler.h>
#include <asm/uaccess.h>
+#include <linux/cpuset.h>
#include <linux/gfp.h>

/*
@@ -53,11 +54,19 @@ void release_pages(struct page **pages,

static inline struct page *page_cache_alloc(struct address_space *x)
{
+ if (cpuset_mem_spread_check()) {
+ int n = cpuset_mem_spread_node();
+ return alloc_pages_node(n, mapping_gfp_mask(x), 0);
+ }
return alloc_pages(mapping_gfp_mask(x), 0);
}

static inline struct page *page_cache_alloc_cold(struct address_space *x)
{
+ if (cpuset_mem_spread_check()) {
+ 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);
}

--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.650.933.1373
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