On 01/31/2013 02:19 PM, Simon Jeons wrote:
Hi Tang,
On Thu, 2013-01-31 at 11:31 +0800, Tang Chen wrote:
Hi Simon,
Please see below. :)
On 01/31/2013 09:22 AM, Simon Jeons wrote:
Sorry, I still confuse. :(
update node_states[N_NORMAL_MEMORY] to node_states[N_MEMORY] or
node_states[N_NORMAL_MEMOR] present 0...ZONE_MOVABLE?
node_states is what? node_states[N_NORMAL_MEMOR] or
node_states[N_MEMORY]?
Are you asking what node_states[] is ?
node_states[] is an array of nodemask,
extern nodemask_t node_states[NR_NODE_STATES];
For example, node_states[N_NORMAL_MEMOR] represents which nodes have
normal memory.
If N_MEMORY == N_HIGH_MEMORY == N_NORMAL_MEMORY, node_states[N_MEMORY] is
node_states[N_NORMAL_MEMOR]. So it represents which nodes have 0 ...
ZONE_MOVABLE.
Sorry, how can nodes_state[N_NORMAL_MEMORY] represents a node have 0 ...
*ZONE_MOVABLE*, the comment of enum nodes_states said that
N_NORMAL_MEMORY just means the node has regular memory.
Hi Simon,
Let's say it in this way.
If we don't have CONFIG_HIGHMEM, N_HIGH_MEMORY == N_NORMAL_MEMORY. We
don't have a separate
macro to represent highmem because we don't have highmem.
This is easy to understand, right ?
Now, think it just like above:
If we don't have CONFIG_MOVABLE_NODE, N_MEMORY == N_HIGH_MEMORY ==
N_NORMAL_MEMORY.
This means we don't allow a node to have only movable memory, not we
don't have movable memory.
A node could have normal memory and movable memory. So
nodes_state[N_NORMAL_MEMORY] represents
a node have 0 ... *ZONE_MOVABLE*.
I think the point is: CONFIG_MOVABLE_NODE means we allow a node to have
only movable memory.
So without CONFIG_MOVABLE_NODE, it doesn't mean a node cannot have
movable memory. It means
the node cannot have only movable memory. It can have normal memory and
movable memory.
1) With CONFIG_MOVABLE_NODE:
N_NORMAL_MEMORY: nodes who have normal memory.
normal memory only
normal and highmem
normal and highmem and movablemem
normal and movablemem
N_MEMORY: nodes who has memory (any memory)
normal memory only
normal and highmem
normal and highmem and movablemem
normal and movablemem ---------------- We can have
movablemem.
highmem only -------------------------
highmem and movablemem ---------------
movablemem only ---------------------- We can have
movablemem only. ***
2) With out CONFIG_MOVABLE_NODE:
N_MEMORY == N_NORMAL_MEMORY: (Here, I omit N_HIGH_MEMORY)
normal memory only
normal and highmem
normal and highmem and movablemem
normal and movablemem ---------------- We can have
movablemem.
No movablemem only ------------------- We cannot
have movablemem only. ***
The semantics is not that clear here. So we can only try to understand
it from the code where
we use N_MEMORY. :)
That is my understanding of this.
Thanks. :)
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