Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 43/46] sched: numa: Rename mempolicy to HOME | Date | Wed, 21 Nov 2012 10:21:49 +0000 |
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Rename the policy to reflect that while allocations and migrations are based on reference that the home node is taken into account for migration decisions.
Signed-off-by: Mel Gorman <mgorman@suse.de> --- include/uapi/linux/mempolicy.h | 9 ++++++++- mm/mempolicy.c | 9 ++++++--- 2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h index 0d11c3d..4506772 100644 --- a/include/uapi/linux/mempolicy.h +++ b/include/uapi/linux/mempolicy.h @@ -67,7 +67,14 @@ enum mpol_rebind_step { #define MPOL_F_LOCAL (1 << 1) /* preferred local allocation */ #define MPOL_F_REBINDING (1 << 2) /* identify policies in rebinding */ #define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */ -#define MPOL_F_MORON (1 << 4) /* Migrate On pte_numa Reference On Node */ +#define MPOL_F_HOME (1 << 4) /* + * Migrate towards referencing node. + * By building up stats on faults, the + * scheduler will reinforce the choice + * by identifying a home node and + * queueing the task on that node + * where possible. + */ #endif /* _UAPI_LINUX_MEMPOLICY_H */ diff --git a/mm/mempolicy.c b/mm/mempolicy.c index fd20e28..3da7435 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2316,8 +2316,11 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long BUG(); } - /* Migrate the page towards the node whose CPU is referencing it */ - if (pol->flags & MPOL_F_MORON) { + /* + * Migrate pages towards their referencing node. Based on the fault + * statistics a home node will be chosen by the scheduler + */ + if (pol->flags & MPOL_F_HOME) { int last_nid; polnid = numa_node_id(); @@ -2540,7 +2543,7 @@ void __init numa_policy_init(void) preferred_node_policy[nid] = (struct mempolicy) { .refcnt = ATOMIC_INIT(1), .mode = MPOL_PREFERRED, - .flags = MPOL_F_MOF | MPOL_F_MORON, + .flags = MPOL_F_MOF | MPOL_F_HOME, .v = { .preferred_node = nid, }, }; } -- 1.7.9.2
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