[Qemu-devel] [PATCH] exec: Advise huge pages for the TCG code gen buffer

[Richard Henderson]

After allocating 32MB or more contiguous memory, huge pages
would seem to be ideal.

Signed-off-by: Richard Henderson <address@hidden>
---
 exec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/exec.c b/exec.c
index df67938..ab07f68 100644
--- a/exec.c
+++ b/exec.c
@@ -602,6 +602,8 @@ static inline void code_gen_alloc(size_t tb_size)
         exit(1);
     }
 
+    qemu_madvise(code_gen_buffer, code_gen_buffer_size, QEMU_MADV_HUGEPAGE);
+
     /* Steal room for the prologue at the end of the buffer.  This ensures
        (via the MAX_CODE_GEN_BUFFER_SIZE limits above) that direct branches
        from TB's to the prologue are going to be in range.  It also means
-- 
1.7.11.7