linux-kernel - Re: [06/44] numa: fix slab_node(MPOL

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Message-ID: <1291784825.5324.59.camel@edumazet-laptop>
Date:	Wed, 08 Dec 2010 06:07:05 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, stable-review@...nel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mel Gorman <mel@....ul.ie>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [06/44] numa: fix slab_node(MPOL_BIND)

Le mercredi 08 décembre 2010 à 05:33 +0100, Eric Dumazet a écrit :

> By the way, anybody knows how I can emulate a memoryless node on a dual
> node x86_64 machine (with memory present on both nodes) ?
> 
> 

this hack works for me :

diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index a35cb9d..1087333 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -261,6 +261,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 	end = start + ma->length;
 	pxm = ma->proximity_domain;
 	node = setup_node(pxm);
+	node = 0;
 	if (node < 0) {
 		printk(KERN_ERR "SRAT: Too many proximity domains.\n");
 		bad_srat();

[    0.000000] SRAT: PXM 0 -> APIC 0x00 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x01 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x02 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x03 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x04 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x05 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x06 -> Node 0
[    0.000000] SRAT: PXM 0 -> APIC 0x07 -> Node 0
[    0.000000] SRAT: PXM 1 -> APIC 0x10 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x11 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x12 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x13 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x14 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x15 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x16 -> Node 1
[    0.000000] SRAT: PXM 1 -> APIC 0x17 -> Node 1
[    0.000000] SRAT: Node 0 PXM 0 0-80000000
[    0.000000] SRAT: Node 0 PXM 1 80000000-e0000000
[    0.000000] SRAT: Node 0 PXM 1 100000000-120000000
[    0.000000] SRAT: Node 0 [0,80000000) + [80000000,e0000000) -> [0,e0000000)
[    0.000000] SRAT: Node 0 [0,e0000000) + [100000000,120000000) -> [0,120000000)
[    0.000000] NUMA: Using 63 for the hash shift.


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