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[PATCH] mm: page_state fixes

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read_page_state and __get_page_state only traverse online CPUs, which will
cause results to fluctuate when CPUs are plugged in or out.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin
2006-01-06 00:11:00 -08:00
committed by Linus Torvalds
parent 2d92c5c915
commit a86b1f5316
1 changed files with 2 additions and 3 deletions
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5
mm/page_alloc.c
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@@ -1169,12 +1169,11 @@ EXPORT_SYMBOL(nr_pagecache);
DEFINE_PER_CPU(long, nr_pagecache_local) = 0; DEFINE_PER_CPU(long, nr_pagecache_local) = 0;
#endif #endif
void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask) static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
{ {
int cpu = 0; int cpu = 0;
memset(ret, 0, sizeof(*ret)); memset(ret, 0, sizeof(*ret));
cpus_and(*cpumask, *cpumask, cpu_online_map);
cpu = first_cpu(*cpumask); cpu = first_cpu(*cpumask);
while (cpu < NR_CPUS) { while (cpu < NR_CPUS) {
@@ -1227,7 +1226,7 @@ unsigned long __read_page_state(unsigned long offset)
unsigned long ret = 0; unsigned long ret = 0;
int cpu; int cpu;
for_each_online_cpu(cpu) { for_each_cpu(cpu) {
unsigned long in; unsigned long in;
in = (unsigned long)&per_cpu(page_states, cpu) + offset; in = (unsigned long)&per_cpu(page_states, cpu) + offset;