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SubjectRe: [STACK] >3k call path in ide
Jörn Engel <joern@wohnheim.fh-wedel.de> wrote:
>
> read_page_state doesn't exist in 2.6.7-rc3 or 2.6.6-mm5. How is it
> defined?

It was in 2.6.7-rc3-mm1.



struct page_state is large (148 bytes) and we put them on the stack in awkward
code paths (page reclaim...)

So implement a simple read_page_state() which can be used to pluck out a
single member from the all-cpus page_state accumulators.

Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/include/linux/page-flags.h | 4 ++++
25-akpm/mm/page_alloc.c | 17 +++++++++++++++++
2 files changed, 21 insertions(+)
diff -puN include/linux/page-flags.h~read_page_state include/linux/page-flags.h
--- 25/include/linux/page-flags.h~read_page_state Wed Jun 9 17:06:33 2004
+++ 25-akpm/include/linux/page-flags.h Wed Jun 9 17:06:33 2004
@@ -139,6 +139,10 @@ DECLARE_PER_CPU(struct page_state, page_

extern void get_page_state(struct page_state *ret);
extern void get_full_page_state(struct page_state *ret);
+extern unsigned long __read_page_state(unsigned offset);
+
+#define read_page_state(member) \
+ __read_page_state(offsetof(struct page_state, member))

#define mod_page_state(member, delta) \
do { \
diff -puN mm/page_alloc.c~read_page_state mm/page_alloc.c
--- 25/mm/page_alloc.c~read_page_state Wed Jun 9 17:06:33 2004
+++ 25-akpm/mm/page_alloc.c Wed Jun 9 17:11:57 2004
@@ -947,6 +947,23 @@ void get_full_page_state(struct page_sta
__get_page_state(ret, sizeof(*ret) / sizeof(unsigned long));
}

+unsigned long __read_page_state(unsigned offset)
+{
+ unsigned long ret = 0;
+ int cpu;
+
+ for (cpu = 0; cpu < NR_CPUS; cpu++) {
+ unsigned long in;
+
+ if (!cpu_possible(cpu))
+ continue;
+
+ in = (unsigned long)&per_cpu(page_states, cpu) + offset;
+ ret += *((unsigned long *)in);
+ }
+ return ret;
+}
+
void get_zone_counts(unsigned long *active,
unsigned long *inactive, unsigned long *free)
{
_
-
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