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| author | Anton Blanchard <anton@samba.org> | 2009-02-13 11:57:30 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-02-23 10:48:58 +1100 |
| commit | 13870b657578bcce167978ee93dc02bf54e3beb0 (patch) | |
| tree | c7c5ece57c707eacf465af5b954c7b4234b71d96 /arch/powerpc/mm/hash_utils_64.c | |
| parent | 33f00dcedb0e22cdb156a23632814fc580fcfcf8 (diff) | |
| download | lwn-13870b657578bcce167978ee93dc02bf54e3beb0.tar.gz lwn-13870b657578bcce167978ee93dc02bf54e3beb0.zip | |
powerpc/mm: Reduce hashtable size when using 64kB pages
At the moment we size the hashtable based on 4kB pages / 2, even on a
64kB kernel. This results in a hashtable that is much larger than it
needs to be.
Grab the real page size and size the hashtable based on that
Note: This only has effect on non hypervisor machines.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 8d5b4758c13a..f5bc1b213f24 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -516,7 +516,7 @@ static int __init htab_dt_scan_pftsize(unsigned long node, static unsigned long __init htab_get_table_size(void) { - unsigned long mem_size, rnd_mem_size, pteg_count; + unsigned long mem_size, rnd_mem_size, pteg_count, psize; /* If hash size isn't already provided by the platform, we try to * retrieve it from the device-tree. If it's not there neither, we @@ -534,7 +534,8 @@ static unsigned long __init htab_get_table_size(void) rnd_mem_size <<= 1; /* # pages / 2 */ - pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11); + psize = mmu_psize_defs[mmu_virtual_psize].shift; + pteg_count = max(rnd_mem_size >> (psize + 1), 1UL << 11); return pteg_count << 7; } |