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exec: reduce L2_PAGE_SIZE

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With the single exception of ppc with 16M pages,
we get the same number of levels
with L2_PAGE_SIZE = 10 as with L2_PAGE_SIZE = 9.

by doing this we reduce memory footprint of a single level
in the node memory map by 2x without runtime overhead.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-11-13 20:13:03 +02:00
parent 57271d63c4
commit 026736cebf
1 changed files with 1 additions and 1 deletions
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2
exec.c
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@ -96,7 +96,7 @@ struct PhysPageEntry {
/* Size of the L2 (and L3, etc) page tables. */
#define ADDR_SPACE_BITS 64
#define P_L2_BITS 10
#define P_L2_BITS 9
#define P_L2_SIZE (1 << P_L2_BITS)
#define P_L2_LEVELS (((ADDR_SPACE_BITS - TARGET_PAGE_BITS - 1) / P_L2_BITS) + 1)