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/shmem.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'mm/shmem.c') diff --git a/mm/shmem.c b/mm/shmem.c index 131f2938f3a..855b93b3637 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -971,7 +971,7 @@ static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_ *nodelist++ = '\0'; if (nodelist_parse(nodelist, *policy_nodes)) goto out; - if (!nodes_subset(*policy_nodes, node_online_map)) + if (!nodes_subset(*policy_nodes, node_states[N_HIGH_MEMORY])) goto out; } if (!strcmp(value, "default")) { @@ -996,9 +996,11 @@ static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_ err = 0; } else if (!strcmp(value, "interleave")) { *policy = MPOL_INTERLEAVE; - /* Default to nodes online if no nodelist */ + /* + * Default to online nodes with memory if no nodelist + */ if (!nodelist) - *policy_nodes = node_online_map; + *policy_nodes = node_states[N_HIGH_MEMORY]; err = 0; } out: @@ -1060,7 +1062,8 @@ shmem_alloc_page(gfp_t gfp, struct shmem_inode_info *info, return page; } #else -static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes) +static inline int shmem_parse_mpol(char *value, int *policy, + nodemask_t *policy_nodes) { return 1; } @@ -2238,7 +2241,7 @@ static int shmem_fill_super(struct super_block *sb, unsigned long blocks = 0; unsigned long inodes = 0; int policy = MPOL_DEFAULT; - nodemask_t policy_nodes = node_online_map; + nodemask_t policy_nodes = node_states[N_HIGH_MEMORY]; #ifdef CONFIG_TMPFS /* -- cgit v1.2.3-18-g5258