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authorAndi Kleen <ak@suse.de>2005-08-26 21:34:10 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-08-26 22:37:12 -0400
commit485761bd6a72d33b3d4fa884927b2b0d983b701e (patch)
treec75562513489f62c8dcfd41acd467bca3d3202cc /include/asm-x86_64/e820.h
parentbebf4688e9dbbfdd421736685d607bced91a3c91 (diff)
[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 'include/asm-x86_64/e820.h')
-rw-r--r--include/asm-x86_64/e820.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/asm-x86_64/e820.h b/include/asm-x86_64/e820.h
index 8e94edf0b984..e682edc24a68 100644
--- a/include/asm-x86_64/e820.h
+++ b/include/asm-x86_64/e820.h
@@ -51,6 +51,8 @@ extern int e820_mapped(unsigned long start, unsigned long end, unsigned type);
51 51
52extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end); 52extern void e820_bootmem_free(pg_data_t *pgdat, unsigned long start,unsigned long end);
53extern void e820_setup_gap(void); 53extern void e820_setup_gap(void);
54extern unsigned long e820_hole_size(unsigned long start_pfn,
55 unsigned long end_pfn);
54 56
55extern void __init parse_memopt(char *p, char **end); 57extern void __init parse_memopt(char *p, char **end);
56 58