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| author | Andi Kleen <ak@suse.de> | 2005-08-26 18:34:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-26 19:37:12 -0700 |
| commit | 485761bd6a72d33b3d4fa884927b2b0d983b701e (patch) | |
| tree | c75562513489f62c8dcfd41acd467bca3d3202cc /arch/x86_64/mm | |
| parent | bebf4688e9dbbfdd421736685d607bced91a3c91 (diff) | |
| download | blackbird-op-linux-485761bd6a72d33b3d4fa884927b2b0d983b701e.tar.gz blackbird-op-linux-485761bd6a72d33b3d4fa884927b2b0d983b701e.zip | |
[PATCH] x86_64: Tell VM about holes in nodes
Some nodes can have large holes on x86-64.
This fixes problems with the VM allowing too many dirty pages because it
overestimates the number of available RAM in a node. In extreme cases you
can end up with all RAM filled with dirty pages which can lead to deadlocks
and other nasty behaviour.
This patch just tells the VM about the known holes from e820. Reserved
(like the kernel text or mem_map) is still not taken into account, but that
should be only a few percent error now.
Small detail is that the flat setup uses the NUMA free_area_init_node() now
too because it offers more flexibility.
(akpm: lotsa thanks to Martin for working this problem out)
Cc: Martin Bligh <mbligh@mbligh.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/mm')
| -rw-r--r-- | arch/x86_64/mm/init.c | 16 | ||||
| -rw-r--r-- | arch/x86_64/mm/numa.c | 8 |
2 files changed, 19 insertions, 5 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c index 72e4b364ed73..aa4a5189ecee 100644 --- a/arch/x86_64/mm/init.c +++ b/arch/x86_64/mm/init.c @@ -322,18 +322,26 @@ void zap_low_mappings(void) void __init paging_init(void) { { - unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; + unsigned long zones_size[MAX_NR_ZONES]; + unsigned long holes[MAX_NR_ZONES]; unsigned int max_dma; + memset(zones_size, 0, sizeof(zones_size)); + memset(holes, 0, sizeof(holes)); + max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; - if (end_pfn < max_dma) + if (end_pfn < max_dma) { zones_size[ZONE_DMA] = end_pfn; - else { + holes[ZONE_DMA] = e820_hole_size(0, end_pfn); + } else { zones_size[ZONE_DMA] = max_dma; + holes[ZONE_DMA] = e820_hole_size(0, max_dma); zones_size[ZONE_NORMAL] = end_pfn - max_dma; + holes[ZONE_NORMAL] = e820_hole_size(max_dma, end_pfn); } - free_area_init(zones_size); + free_area_init_node(0, NODE_DATA(0), zones_size, + __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes); } return; } diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c index 70cb2904a90f..6a156f5692ae 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -126,9 +126,11 @@ void __init setup_node_zones(int nodeid) { unsigned long start_pfn, end_pfn; unsigned long zones[MAX_NR_ZONES]; + unsigned long holes[MAX_NR_ZONES]; unsigned long dma_end_pfn; memset(zones, 0, sizeof(unsigned long) * MAX_NR_ZONES); + memset(holes, 0, sizeof(unsigned long) * MAX_NR_ZONES); start_pfn = node_start_pfn(nodeid); end_pfn = node_end_pfn(nodeid); @@ -139,13 +141,17 @@ void __init setup_node_zones(int nodeid) dma_end_pfn = __pa(MAX_DMA_ADDRESS) >> PAGE_SHIFT; if (start_pfn < dma_end_pfn) { zones[ZONE_DMA] = dma_end_pfn - start_pfn; + holes[ZONE_DMA] = e820_hole_size(start_pfn, dma_end_pfn); zones[ZONE_NORMAL] = end_pfn - dma_end_pfn; + holes[ZONE_NORMAL] = e820_hole_size(dma_end_pfn, end_pfn); + } else { zones[ZONE_NORMAL] = end_pfn - start_pfn; + holes[ZONE_NORMAL] = e820_hole_size(start_pfn, end_pfn); } free_area_init_node(nodeid, NODE_DATA(nodeid), zones, - start_pfn, NULL); + start_pfn, holes); } void __init numa_init_array(void) |
