exec: Advise huge pages for the TCG code gen buffer

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

Signed-off-by: Richard Henderson <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>

diff --git a/exec.c b/exec.c
index 8435de0bd2f9248e9050db27ff7fbd78eb4351f8..0594b0705736c124857b3c1993690e7ca5848f6b 100644 (file)
--- a/exec.c
+++ b/exec.c
@@ -607,6 +607,8 @@ 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