linux-kernel - [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node.

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Date:	Sat, 02 Feb 2008 17:12:30 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Andi Kleen <andi@...stfloor.org>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node.

Hi

I tested numactl on 2.6.24-rc8-mm1.
and I found strange behavior.

test method and result.

	$ numactl --interleave=all ls
	set_mempolicy: Invalid argument
	setting interleave mask: Invalid argument

numactl command download from
	ftp://ftp.suse.com/pub/people/ak/numa/
	(I choice numactl-1.0.2)


Of course, older kernel(RHEL5.1) works good.



more detail:

1. my machine node and memory.

$ numactl --hardware
available: 16 nodes (0-15)
node 0 size: 0 MB
node 0 free: 0 MB
node 1 size: 0 MB
node 1 free: 0 MB
node 2 size: 3872 MB
node 2 free: 1487 MB
node 3 size: 4032 MB
node 3 free: 3671 MB
node 4 size: 0 MB
node 4 free: 0 MB
node 5 size: 0 MB
node 5 free: 0 MB
node 6 size: 0 MB
node 6 free: 0 MB
node 7 size: 0 MB
node 7 free: 0 MB
node 8 size: 0 MB
node 8 free: 0 MB
node 9 size: 0 MB
node 9 free: 0 MB
node 10 size: 0 MB
node 10 free: 0 MB
node 11 size: 0 MB
node 11 free: 0 MB
node 12 size: 0 MB
node 12 free: 0 MB
node 13 size: 0 MB
node 13 free: 0 MB
node 14 size: 0 MB
node 14 free: 0 MB
node 15 size: 0 MB
node 15 free: 0 MB


2. numactl behavior of --interleave=all
   2.1  scan "/sys/devices/system/node" dir
   2.2  calculate max node number
   2.3  all bit turn on of existing node.
        (i.e. 0xFF generated on my environment.)
   2.4  call set_mempolicy()

3. 2.6.24-rc8-mm1 set_mempolicy(2) behavior
   3.1 check nodesubset(nodemask argument, node_states[N_HIGH_MEMORY])
       in mpol_check_policy()

	-> check failed when memmoryless node exist.
           (i.e. node_states[N_HIGH_MEMORY] of my machine is 0xc)

4. RHEL5.1 set_mempolicy(2) behavior
   4.1 check nodesubset(nodemask argument, node_online_map)
       in mpol_check_policy().

	-> check success.


I don't know wrong either kernel or libnuma.
Please any comments!


- kosaki



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