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Subject[PATCH] mm: swap prefetch fix lowmem reserve calc
Date
When examining the free limits in swap_prefetch we should ensure the largest
lowmem_reserve for each zone is free.

Signed-off-by: Con Kolivas <kernel@kolivas.org>

---
mm/swap_prefetch.c | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletion(-)

Index: linux-2.6.17-rc4-mm1/mm/swap_prefetch.c
===================================================================
--- linux-2.6.17-rc4-mm1.orig/mm/swap_prefetch.c 2006-05-18 15:48:22.000000000 +1000
+++ linux-2.6.17-rc4-mm1/mm/swap_prefetch.c 2006-05-18 15:52:42.000000000 +1000
@@ -258,6 +258,18 @@ static void clear_current_prefetch_free(
}
}

+static inline unsigned long largest_lowmem_reserve(struct zone *z)
+{
+ unsigned long ret = 0;
+ unsigned int idx = zone_idx(z);
+
+ while (!is_highmem_idx(idx)) {
+ idx++;
+ ret = max(ret, z->lowmem_reserve[idx]);
+ }
+ return ret;
+}
+
/*
* This updates the high and low watermarks of amount of free ram in each
* node used to start and stop prefetching. We prefetch from pages_high * 4
@@ -276,7 +288,7 @@ static void examine_free_limits(void)

ns = &sp_stat.node[z->zone_pgdat->node_id];
idx = zone_idx(z);
- ns->lowfree[idx] = z->pages_high * 3 + z->lowmem_reserve[idx];
+ ns->lowfree[idx] = z->pages_high * 3 + largest_lowmem_reserve(z);
ns->highfree[idx] = ns->lowfree[idx] + z->pages_high;

if (z->free_pages > ns->highfree[idx]) {
--
-ck
-
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