From ef44e9475ab38ec73b30e83241279170fac06b22 Mon Sep 17 00:00:00 2001

From: Izik Eidus <ieidus@redhat.com>

Date: Tue, 28 Jul 2009 19:14:26 +0300

Subject: [PATCH] kvm userspace: ksm support

rfc for ksm support to kvm userpsace.

Signed-off-by: Izik Eidus <ieidus@redhat.com>

signed-off-by: Justin M. Forbes <jforbes@redhat.com>

Signed-off-by: Mark McLoughlin <markmc@redhat.com>

Fedora-patch: qemu-add-ksm-support.patch

---

 exec.c |    6 ++++++

 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/exec.c b/exec.c

index 0655b4b..a0e2203 100644

--- a/exec.c

+++ b/exec.c

@@ -65,6 +65,9 @@

 #undef DEBUG_TB_CHECK

 #endif

+/* Quick hack to enable KSM support */

+#define MADV_MERGEABLE 12 /* KSM may merge identical pages */

+

 #define SMC_BITMAP_USE_THRESHOLD 10

 #if defined(TARGET_SPARC64)

@@ -2579,6 +2582,9 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)

     new_block->host = file_ram_alloc(size, mem_path);

     if (!new_block->host) {

         new_block->host = qemu_vmalloc(size);

+#ifdef MADV_MERGEABLE

+        madvise(new_block->host, size, MADV_MERGEABLE);

+#endif

     }

     new_block->offset = last_ram_offset;

     new_block->length = size;

-- 

1.6.2.5