[V4 PATCH 05/26] node_states: introduce N_MEMORY

From: Lai Jiangshan
Date: Mon Sep 10 2012 - 05:05:45 EST

We have N_NORMAL_MEMORY for standing for the nodes that have normal memory with
zone_type <= ZONE_NORMAL.

And we have N_HIGH_MEMORY for standing for the nodes that have normal or high

But we don't have any word to stand for the nodes that have *any* memory.

And we have N_CPU but without N_MEMORY.

Current code reuse the N_HIGH_MEMORY for this purpose because any node which
has memory must have high memory or normal memory currently.

A) But this reusing is bad for *readability*. Because the name
N_HIGH_MEMORY just stands for high or normal:

A.example 1)
for_each_node_state(nid, N_HIGH_MEMORY)

The user will be confused(why this function just counts for high or
normal memory node? does it counts for ZONE_MOVABLE's lru pages?)
until someone else tell them N_HIGH_MEMORY is reused to stand for
nodes that have any memory.

A.cont) If we introduce N_MEMORY, we can reduce this confusing
AND make the code more clearly:

A.example 2) mm/page_cgroup.c use N_HIGH_MEMORY twice:

One is in page_cgroup_init(void):
for_each_node_state(nid, N_HIGH_MEMORY) {

It means if the node have memory, we will allocate page_cgroup map for
the node. We should use N_MEMORY instead here to gaim more clearly.

The second using is in alloc_page_cgroup():
if (node_state(nid, N_HIGH_MEMORY))
addr = vzalloc_node(size, nid);

It means if the node has high or normal memory that can be allocated
from kernel. We should keep N_HIGH_MEMORY here, and it will be better
if the "any memory" semantic of N_HIGH_MEMORY is removed.

B) This reusing is out-dated if we introduce MOVABLE-dedicated node.
The MOVABLE-dedicated node should not appear in
node_stats[N_HIGH_MEMORY] nor node_stats[N_NORMAL_MEMORY],
because MOVABLE-dedicated node has no high or normal memory.

In x86_64, N_HIGH_MEMORY=N_NORMAL_MEMORY, if a MOVABLE-dedicated node
is in node_stats[N_HIGH_MEMORY], it is also means it is in
node_stats[N_NORMAL_MEMORY], it causes SLUB wrong.

The slub uses
for_each_node_state(nid, N_NORMAL_MEMORY)
and creates kmem_cache_node for MOVABLE-dedicated node and cause problem.

In one word, we need a N_MEMORY. We just intrude it as an alias to
N_HIGH_MEMORY and fix all im-proper usages of N_HIGH_MEMORY in late patches.

Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Acked-by: Hillf Danton <dhillf@xxxxxxxxx>
include/linux/nodemask.h | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 7afc363..c6ebdc9 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -380,6 +380,7 @@ enum node_states {
N_CPU, /* The node has one or more cpus */

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