[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [RFC PATCH] page_alloc: use first half of higher order chunks when halving



On 04/16/14 07:15, Konrad Rzeszutek Wilk wrote:
On Mon, Apr 14, 2014 at 04:34:47PM +0100, Jan Beulich wrote:
On 14.04.14 at 16:40, <konrad.wilk@xxxxxxxxxx> wrote:
That was OK, but the M2P lookup table was not too thrilled with this.
Perhaps I should have used another hypercall to re-arrange the M2P?
I think I did try 'XENMEM_exchange' but that is not the right call either.
Yeah, that's allocating new pages in exchange for your old ones. Not
really what you want.

Perhaps I should use XENMEM_remove_from_physmap/XENMEM_add_to_physmap
combo ?
A pair of MMU_MACHPHYS_UPDATE operations would seem to be the
right way of doing this (along with respective kernel internal accounting
like set_phys_to_machine(), and perhaps a pair of update_va_mapping
operations if the 1:1 map is already in place at that time, and you care
about which page contents appears at which virtual address).
OK.

Matt & Matthew - my plate is quite filled and I fear that in the next three
weeks there is not going to be much time to code up a prototype.

Would either one of you be willing to take a crack at this? It would
be neat as we could remove a lot of the balloon increase/decrease code
in arch/x86/xen/setup.c.

Thanks!

Yeah sure. It won't be immediatly but I should be able to do that.


Jan



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.