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[PATCH] x86_64: Account mem_map in VM holes accounting 

The VM needs to know about lost memory in zones to accurately
balance dirty pages. This patch accounts mem_map in there too,
which fixes a constant errror of a few percent. Also some
other misc mappings and the kernel text itself are accounted
too.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-11-05 17:25:53 +01:00 committed by Linus Torvalds
parent b0d4169321
commit e18c6874a5
1 changed files with 19 additions and 0 deletions
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19
arch/x86_64/mm/init.c
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@ -47,6 +47,8 @@ extern int swiotlb;
extern char _stext[];
static unsigned long dma_reserve __initdata;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
/*
@ -354,6 +356,21 @@ size_zones(unsigned long *z, unsigned long *h,
w += z[i];
h[i] = e820_hole_size(s, w);
}
/* Add the space pace needed for mem_map to the holes too. */
for (i = 0; i < MAX_NR_ZONES; i++)
h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE;
/* The 16MB DMA zone has the kernel and other misc mappings.
Account them too */
if (h[ZONE_DMA]) {
h[ZONE_DMA] += dma_reserve;
if (h[ZONE_DMA] >= z[ZONE_DMA]) {
printk(KERN_WARNING
"Kernel too large and filling up ZONE_DMA?\n");
h[ZONE_DMA] = z[ZONE_DMA];
}
}
}
#ifndef CONFIG_NUMA
@ -510,6 +527,8 @@ void __init reserve_bootmem_generic(unsigned long phys, unsigned len)
#else
reserve_bootmem(phys, len);
#endif
if (phys+len <= MAX_DMA_PFN*PAGE_SIZE)
dma_reserve += len / PAGE_SIZE;
}
int kern_addr_valid(unsigned long addr)