Blame qemu-add-ksm-support.patch
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From c6c94b043e8b3593d0beb52966dce43069233840 Mon Sep 17 00:00:00 2001
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From: Izik Eidus <ieidus@redhat.com>
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Date: Tue, 28 Jul 2009 19:14:26 +0300
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Subject: [PATCH] kvm userspace: ksm support
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rfc for ksm support to kvm userpsace.
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Signed-off-by: Izik Eidus <ieidus@redhat.com>
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signed-off-by: Justin M. Forbes <jforbes@redhat.com>
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Signed-off-by: Mark McLoughlin <markmc@redhat.com>
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Fedora-patch: qemu-add-ksm-support.patch
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---
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exec.c | 6 ++++++
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1 files changed, 6 insertions(+), 0 deletions(-)
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diff --git a/exec.c b/exec.c
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index 0655b4b..a0e2203 100644
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--- a/exec.c
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+++ b/exec.c
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@@ -65,6 +65,9 @@
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#undef DEBUG_TB_CHECK
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#endif
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+/* Quick hack to enable KSM support */
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+#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
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+
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#define SMC_BITMAP_USE_THRESHOLD 10
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#if defined(TARGET_SPARC64)
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@@ -2579,6 +2582,9 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
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new_block->host = file_ram_alloc(size, mem_path);
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if (!new_block->host) {
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new_block->host = qemu_vmalloc(size);
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+#ifdef MADV_MERGEABLE
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+ madvise(new_block->host, size, MADV_MERGEABLE);
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+#endif
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}
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new_block->offset = last_ram_offset;
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new_block->length = size;
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--
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1.6.2.5
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