Re: kvm userspace: ksm support

[Izik Eidus]

Brian Jackson wrote:
If someone wanted to play around with ksm in qemu-kvm-0.x.x would it be as 
simple as adding the below additions to kvm_setup_guest_memory in kvm-all.c

qemu-kvm-0.x.x doesnt tell me much, but if it is the function that 
register the memory than yes...

(I just remember that qemu used to have something called phys_ram_base, 
in that case it would be just making madvise on phys_ram_base with the 
same of phys_ram_size....)

 
(and adding the necessary kernel changes of course)?


On Tuesday 28 July 2009 11:39:59 am Izik Eidus wrote:
  
This patch is not for inclusion just rfc.

Thanks.


From 1297b86aa257100b3d819df9f9f0932bf4f7f49d Mon Sep 17 00:00:00 2001
From: Izik Eidus <iei...@redhat.com>
Date: Tue, 28 Jul 2009 19:14:26 +0300
Subject: [PATCH] kvm userspace: ksm support

rfc for ksm support to kvm userpsace.

thanks

Signed-off-by: Izik Eidus <iei...@redhat.com>
---
 exec.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/exec.c b/exec.c
index f6d9ec9..375cc18 100644
--- a/exec.c
+++ b/exec.c
@@ -2595,6 +2595,9 @@ 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;
    

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