From 37b07e4163f7306aa735a6e250e8d22293e5b8de Mon Sep 17 00:00:00 2001 From: Lee Schermerhorn Date: Tue, 16 Oct 2007 01:25:39 -0700 Subject: memoryless nodes: fixup uses of node_online_map in generic code Here's a cut at fixing up uses of the online node map in generic code. mm/shmem.c:shmem_parse_mpol() Ensure nodelist is subset of nodes with memory. Use node_states[N_HIGH_MEMORY] as default for missing nodelist for interleave policy. mm/shmem.c:shmem_fill_super() initialize policy_nodes to node_states[N_HIGH_MEMORY] mm/page-writeback.c:highmem_dirtyable_memory() sum over nodes with memory mm/page_alloc.c:zlc_setup() allowednodes - use nodes with memory. mm/page_alloc.c:default_zonelist_order() average over nodes with memory. mm/page_alloc.c:find_next_best_node() skip nodes w/o memory. N_HIGH_MEMORY state mask may not be initialized at this time, unless we want to depend on early_calculate_totalpages() [see below]. Will ZONE_MOVABLE ever be configurable? mm/page_alloc.c:find_zone_movable_pfns_for_nodes() spread kernelcore over nodes with memory. This required calling early_calculate_totalpages() unconditionally, and populating N_HIGH_MEMORY node state therein from nodes in the early_node_map[]. If we can depend on this, we can eliminate the population of N_HIGH_MEMORY mask from __build_all_zonelists() and use the N_HIGH_MEMORY mask in find_next_best_node(). mm/mempolicy.c:mpol_check_policy() Ensure nodes specified for policy are subset of nodes with memory. [akpm@linux-foundation.org: fix warnings] Signed-off-by: Lee Schermerhorn Acked-by: Christoph Lameter Cc: Shaohua Li Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/mempolicy.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'mm/mempolicy.c') diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 0d70fb7d83b..2c521defb41 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -126,7 +126,7 @@ static int mpol_check_policy(int mode, nodemask_t *nodes) return -EINVAL; break; } - return nodes_subset(*nodes, node_online_map) ? 0 : -EINVAL; + return nodes_subset(*nodes, node_states[N_HIGH_MEMORY]) ? 0 : -EINVAL; } /* Generate a custom zonelist for the BIND policy. */ @@ -965,7 +965,7 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, goto out; } - if (!nodes_subset(new, node_online_map)) { + if (!nodes_subset(new, node_states[N_HIGH_MEMORY])) { err = -EINVAL; goto out; } -- cgit v1.2.3