On Fri, Sep 01, 2006 at 05:36:00PM -0400, sanjay kushwaha wrote:
> Folks,
> I am experiencing that live migration is not working in latest
> xen-unstable. I get the following message during migration
>
> [root@pc5 ksanjay]# xm migrate --live 1 [1]199.77.138.23
> Error: /usr/lib/xen/bin/xc_save 18 1 0 0 1 failed
> [root@pc5 ksanjay]#
>
> I traced the problem to a function in xen named set_sh_allocation() in
> file xen/arch/x86/mm/shadow/common.c
>
> tools/libxc/xc_linux_save.c:xc_linux_save() is called from the python
> script which makes the following hypercall
>
> if (live) {
> if (xc_shadow_control(xc_handle, dom,
> XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
> NULL, 0, NULL, 0, NULL) < 0) {
> ERR("Couldn't enable shadow mode");
> goto out;
> }
> last_iter = 0;
> } else {
> -----------
>
> this particular hypercall leads to the call of set_sh_allocation which
> fails in the following code
>
> if ( d-> arch.shadow.total_pages < pages )
> {
> /* Need to allocate more memory from domheap */
> pg = alloc_domheap_pages(NULL, SHADOW_MAX_ORDER, 0);
> if ( pg == NULL )
> {
> SHADOW_PRINTK("failed to allocate shadow pages.\n");
> return -ENOMEM;
> }
>
> alloc_domheap_pages fails and returns NULL. however I think I have enough
> memory available so this function should not fail.
>
> Is there anybody else experiencing the same problem? Could someone please
> tell me how to fix it?
I've put some changes into xen-unstable today which might help. The last fix
is on its way through testing now. Look out for xen-unstable changeset
11422, and try that, see how you get on.
Cheers,
Ewan.
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