[PATCH v1 4/4] accel/tcg: increase default code gen buffer size for 64 bit

[Alex Bennée]

While 32mb is certainly usable a full system boot ends up flushing the
codegen buffer nearly 100 times. Increase the default on 64 bit hosts
to take advantage of all that spare memory. After this change I can
boot my tests system without any TB flushes.

Signed-off-by: Alex Bennée <address@hidden>
---
 accel/tcg/translate-all.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 4ce5d1b3931..f7baa512059 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -929,7 +929,11 @@ static void page_lock_pair(PageDesc **ret_p1, 
tb_page_addr_t phys1,
 # define MAX_CODE_GEN_BUFFER_SIZE  ((size_t)-1)
 #endif
 
+#if TCG_TARGET_REG_BITS == 32
 #define DEFAULT_CODE_GEN_BUFFER_SIZE_1 (32 * MiB)
+#else
+#define DEFAULT_CODE_GEN_BUFFER_SIZE_1 (2 * GiB)
+#endif
 
 #define DEFAULT_CODE_GEN_BUFFER_SIZE \
   (DEFAULT_CODE_GEN_BUFFER_SIZE_1 < MAX_CODE_GEN_BUFFER_SIZE \
-- 
2.20.1