path: root/Documentation
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authorHugh Dickins <hughd@google.com>2013-02-22 16:36:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:24 -0800
commitef53d16cded7f89b3843b7a96970dab897843ea5 (patch)
tree3098af6a91b088212acb5c459ee9af1488cfdfe1 /Documentation
parentmm: cleanup "swapcache" in do_swap_page (diff)
ksm: allocate roots when needed
It is a pity to have MAX_NUMNODES+MAX_NUMNODES tree roots statically allocated, particularly when very few users will ever actually tune merge_across_nodes 0 to use more than 1+1 of those trees. Not a big deal (only 16kB wasted on each machine with CONFIG_MAXSMP), but a pity. Start off with 1+1 statically allocated, then if merge_across_nodes is ever tuned, allocate for nr_node_ids+nr_node_ids. Do not attempt to free up the extra if it's tuned back, that would be a waste of effort. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Petr Holasek <pholasek@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Izik Eidus <izik.eidus@ravellosystems.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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