Commit 026736ce authored by Michael S. Tsirkin's avatar Michael S. Tsirkin
Browse files

exec: reduce L2_PAGE_SIZE 



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: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 57271d63

exec.c

+1 −1
Original line number Diff line number Diff line
@@ -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)