On 11/07/2011 02:19 PM, Zhi Yong Wu wrote:
On Mon, Nov 7, 2011 at 4:38 PM, Supriya Kannery
<supri...@linux.vnet.ibm.com> wrote:
On 11/04/2011 07:59 AM, Zhi Yong Wu wrote:
On Sun, Oct 30, 2011 at 6:33 PM, Supriya Kannery
<supri...@linux.vnet.ibm.com> wrote:
Currently cache setting of a block device cannot be changed
without restarting a running VM. Following patchset is for
enabling dynamic change of cache setting for block devices
through qemu monitor. Code changes are based on patches
from Christoph Hellwig and Prerna Saxena.
This patchset introduces
a. monitor command 'block_set_hostcache' using which host
pagecache setting for a block device can be changed
dynamically.
I got a bit confusion. Is it used to change host pagecache setting on
hyperviser or on guest?
This block device said by you is for guest, right?
This command is used for changing pagecache setting of
the image files in host which are acting as block devices
for guest.
So what is the difference between it and cache option?
Cache=xx sets a combination of status flags for image files
among which host pagecache is just one. Intention here is
to gradually replace cache=xx with more explicit settings
like hostcache, flush, WCE.
