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| author | Andi Kleen <ak@suse.de> | 2005-11-05 17:25:53 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-14 19:55:13 -0800 |
| commit | e18c6874a505958d153a11f9d6947971c349008a (patch) | |
| tree | 809d61a9e36f9869d875542c9adce1952e202d4b | |
| parent | b0d41693217b3bb5b837940dc7465e82a9d49476 (diff) | |
| download | lwn-e18c6874a505958d153a11f9d6947971c349008a.tar.gz lwn-e18c6874a505958d153a11f9d6947971c349008a.zip | |
[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>
| -rw-r--r-- | arch/x86_64/mm/init.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index a1ad4cc423a7..2b1d6c382396 100644 --- a/arch/x86_64/mm/init.c +++ b/arch/x86_64/mm/init.c @@ -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) |