qemu/qemu-add-ksm-support.patch

43 lines
1.2 KiB
Diff

From c6c94b043e8b3593d0beb52966dce43069233840 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