From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:39083) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TU38o-00069Q-C7 for qemu-devel@nongnu.org; Thu, 01 Nov 2012 18:21:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TU38n-0007Ld-4G for qemu-devel@nongnu.org; Thu, 01 Nov 2012 18:21:34 -0400 Received: from mail-pb0-f45.google.com ([209.85.160.45]:46613) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TU38m-0007LL-U8 for qemu-devel@nongnu.org; Thu, 01 Nov 2012 18:21:33 -0400 Received: by mail-pb0-f45.google.com with SMTP id rp2so1967893pbb.4 for ; Thu, 01 Nov 2012 15:21:32 -0700 (PDT) Sender: Richard Henderson From: Richard Henderson Date: Fri, 2 Nov 2012 09:20:46 +1100 Message-Id: <1351808446-2436-1-git-send-email-rth@twiddle.net> Subject: [Qemu-devel] [PATCH] exec: Advise huge pages for the TCG code gen buffer List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 -- 1.7.11.7