From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:43053) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TKE7i-0002A3-Qs for qemu-devel@nongnu.org; Fri, 05 Oct 2012 16:03:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TKE7i-0006iL-0q for qemu-devel@nongnu.org; Fri, 05 Oct 2012 16:03:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:39647) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TKE7h-0006i8-PJ for qemu-devel@nongnu.org; Fri, 05 Oct 2012 16:03:49 -0400 Date: Fri, 5 Oct 2012 16:47:57 -0300 From: Luiz Capitulino Message-ID: <20121005164758.4808b2d1@doriath.home> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] [PATCH] Call MADV_HUGEPAGE for guest RAM allocations List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel Cc: aarcange@redhat.com, jan.kiszka@siemens.com This makes it possible for QEMU to use transparent huge pages (THP) when transparent_hugepage/enabled=madvise. Otherwise THP is only used when it's enabled system wide. Signed-off-by: Luiz Capitulino --- exec.c | 1 + osdep.h | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/exec.c b/exec.c index 1114a09..7504909 100644 --- a/exec.c +++ b/exec.c @@ -2584,6 +2584,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, cpu_physical_memory_set_dirty_range(new_block->offset, size, 0xff); qemu_ram_setup_dump(new_block->host, size); + qemu_madvise(new_block->host, size, QEMU_MADV_HUGEPAGE); if (kvm_enabled()) kvm_setup_guest_memory(new_block->host, size); diff --git a/osdep.h b/osdep.h index cb213e0..c5fd3d9 100644 --- a/osdep.h +++ b/osdep.h @@ -108,6 +108,11 @@ void qemu_vfree(void *ptr); #else #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID #endif +#ifdef MADV_HUGEPAGE +#define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE +#else +#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID +#endif #elif defined(CONFIG_POSIX_MADVISE) -- 1.7.12.315.g682ce8b