From patchwork Thu Nov 1 22:20:46 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: exec: Advise huge pages for the TCG code gen buffer Date: Thu, 01 Nov 2012 12:20:46 -0000 From: Richard Henderson X-Patchwork-Id: 196393 Message-Id: <1351808446-2436-1-git-send-email-rth@twiddle.net> To: qemu-devel@nongnu.org Cc: Blue Swirl , Anthony Liguori After allocating 32MB or more contiguous memory, huge pages would seem to be ideal. Signed-off-by: Richard Henderson --- 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