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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	"Andrew Morton" <akpm@linux-foundation.org>,
	Christoph Lameter <clameter@sgi.com>,
	Andi Kleen <andi@firstfloor.org>
Cc: kosaki.motohiro@jp.fujitsu.com
Subject: [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node.
Date: Sat, 02 Feb 2008 17:12:30 +0900	[thread overview]
Message-ID: <20080202165054.F491.KOSAKI.MOTOHIRO@jp.fujitsu.com> (raw)

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




             reply	other threads:[~2008-02-02  8:12 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-02  8:12 KOSAKI Motohiro [this message]
2008-02-02  9:09 ` Andi Kleen
2008-02-02  9:37   ` KOSAKI Motohiro
2008-02-02 11:30     ` Andi Kleen
2008-02-04 19:03       ` Christoph Lameter
2008-02-04 18:20     ` Lee Schermerhorn
2008-02-05  9:26       ` [2.6.24 regression][BUGFIX] " KOSAKI Motohiro
2008-02-05 21:57         ` Lee Schermerhorn
2008-02-05 22:12           ` Christoph Lameter
2008-02-06 16:00             ` Lee Schermerhorn
2008-02-05 22:15           ` Paul Jackson
2008-02-06  2:17           ` David Rientjes
2008-02-06 16:11             ` Lee Schermerhorn
2008-02-06  6:49           ` KOSAKI Motohiro
2008-02-06 17:38         ` Lee Schermerhorn
2008-02-07  8:31           ` KOSAKI Motohiro
2008-02-08 19:45         ` [PATCH 2.6.24-mm1] Mempolicy: silently restrict nodemask to allowed nodes V3 Lee Schermerhorn
2008-02-09 18:11           ` KOSAKI Motohiro
2008-02-10  5:29           ` KOSAKI Motohiro
2008-02-10  5:49             ` Greg KH
2008-02-10  7:42               ` Linus Torvalds
2008-02-10 10:31                 ` Andrew Morton
2008-02-11 16:47                 ` Lee Schermerhorn
2008-02-12  4:30                   ` [PATCH for 2.6.24][regression fix] " KOSAKI Motohiro
2008-02-12  5:06                     ` David Rientjes
2008-02-12  5:07                     ` Andrew Morton
2008-02-12 13:18                       ` KOSAKI Motohiro
2008-02-05 10:17       ` [2.6.24-rc8-mm1][regression?] numactl --interleave=all doesn't works on memoryless node Paul Jackson
2008-02-05 11:14         ` KOSAKI Motohiro
2008-02-05 19:56         ` David Rientjes
2008-02-05 20:51           ` Paul Jackson
2008-02-05 21:03             ` David Rientjes
2008-02-05 21:33               ` Paul Jackson
2008-02-05 22:04                 ` Lee Schermerhorn
2008-02-05 22:44                   ` David Rientjes
2008-02-05 22:50                   ` Paul Jackson
2008-02-05 14:31       ` Mel Gorman
2008-02-05 15:23         ` Lee Schermerhorn
2008-02-05 18:12           ` Christoph Lameter
2008-02-05 18:27             ` Lee Schermerhorn
2008-02-05 19:04               ` Christoph Lameter
2008-02-05 19:15                 ` Paul Jackson
2008-02-05 20:06                   ` David Rientjes

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