The patch titled
Sanely size hash tables when using large base pages
has been removed from the -mm tree. Its filename was
sanely-size-hash-tables-when-using-large-base-pages-take-2.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: Sanely size hash tables when using large base pages
From: Paul Mundt <lethal@xxxxxxxxxxxx>
At the moment the inode/dentry cache hash tables (common by way of
alloc_large_system_hash()) are incorrectly sized by their respective
detection logic when we attempt to use large base pages on systems with
little memory.
This results in odd behaviour when using a 64kB PAGE_SIZE, such as:
Dentry cache hash table entries: 8192 (order: -1, 32768 bytes)
Inode-cache hash table entries: 4096 (order: -2, 16384 bytes)
The mount cache hash table is seemingly the only one that gets this right
by directly taking PAGE_SIZE in to account.
The following patch attempts to catch the bogus values and round it up to
at least 0-order.
Signed-off-by: Paul Mundt <lethal@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/page_alloc.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/page_alloc.c~sanely-size-hash-tables-when-using-large-base-pages-take-2 mm/page_alloc.c
--- a/mm/page_alloc.c~sanely-size-hash-tables-when-using-large-base-pages-take-2
+++ a/mm/page_alloc.c
@@ -3321,6 +3321,10 @@ void *__init alloc_large_system_hash(con
numentries >>= (scale - PAGE_SHIFT);
else
numentries <<= (PAGE_SHIFT - scale);
+
+ /* Make sure we've got at least a 0-order allocation.. */
+ if (unlikely((numentries * bucketsize) < PAGE_SIZE))
+ numentries = PAGE_SIZE / bucketsize;
}
numentries = roundup_pow_of_two(numentries);
_
Patches currently in -mm which might be from lethal@xxxxxxxxxxxx are
git-avr32.patch
git-sh.patch
deal-with-cases-of-zone_dma-meaning-the-first-zone.patch
introduce-config_zone_dma.patch
optional-zone_dma-in-the-vm.patch
remove-zone_dma-remains-from-sh-sh64.patch
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