From: Eric Dumazet Date: Mon, 16 Jul 2007 06:38:05 +0000 (-0700) Subject: MM: alloc_large_system_hash() can free some memory for non power-of-two bucketsize X-Git-Tag: v2.6.23-rc1~1034 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1037b83bd04e31449dc9323f1e8ddada4264ef66;p=pandora-kernel.git MM: alloc_large_system_hash() can free some memory for non power-of-two bucketsize alloc_large_system_hash() is called at boot time to allocate space for several large hash tables. Lately, TCP hash table was changed and its bucketsize is not a power-of-two anymore. On most setups, alloc_large_system_hash() allocates one big page (order > 0) with __get_free_pages(GFP_ATOMIC, order). This single high_order page has a power-of-two size, bigger than the needed size. We can free all pages that wont be used by the hash table. On a 1GB i386 machine, this patch saves 128 KB of LOWMEM memory. TCP established hash table entries: 32768 (order: 6, 393216 bytes) Signed-off-by: Eric Dumazet Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed