From: "Mika Penttilä" <mika.penttila@kolumbus.fi>
To: linux-kernel@vger.kernel.org, linux-mm <linux-mm@kvack.org>,
Andi Kleen <ak@suse.de>
Subject: DMA32 zone unusable
Date: Wed, 16 Nov 2005 17:22:24 +0200 [thread overview]
Message-ID: <437B4EB0.3080908@kolumbus.fi> (raw)
The new DMA32 zone (which at least x86-64 has) is quite "interesting" :
#define __GFP_DMA32 ((__force gfp_t)0x04) <-----!!!!!
#define GFP_ZONEMASK 0x03 <------!!!!!
#define gfp_zone(mask) ((__force int)((mask) & (__force gfp_t)GFP_ZONEMASK))
static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
unsigned int order)
{
if (unlikely(order >= MAX_ORDER))
return NULL;
return __alloc_pages(gfp_mask, order,
NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
}
So with GFP_DMA32 you never get those pages (but DMA instead).
--Mika
WARNING: multiple messages have this Message-ID (diff)
From: "Mika Penttilä" <mika.penttila@kolumbus.fi>
To: linux-kernel@vger.kernel.org, linux-mm <linux-mm@kvack.org>,
Andi Kleen <ak@suse.de>
Subject: DMA32 zone unusable
Date: Wed, 16 Nov 2005 17:22:24 +0200 [thread overview]
Message-ID: <437B4EB0.3080908@kolumbus.fi> (raw)
The new DMA32 zone (which at least x86-64 has) is quite "interesting" :
#define __GFP_DMA32 ((__force gfp_t)0x04) <-----!!!!!
#define GFP_ZONEMASK 0x03 <------!!!!!
#define gfp_zone(mask) ((__force int)((mask) & (__force gfp_t)GFP_ZONEMASK))
static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
unsigned int order)
{
if (unlikely(order >= MAX_ORDER))
return NULL;
return __alloc_pages(gfp_mask, order,
NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
}
So with GFP_DMA32 you never get those pages (but DMA instead).
--Mika
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next reply other threads:[~2005-11-16 15:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-16 15:22 Mika Penttilä [this message]
2005-11-16 15:22 ` DMA32 zone unusable Mika Penttilä
2005-11-16 15:53 ` Andi Kleen
2005-11-16 15:53 ` Andi Kleen
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