On 11/30/2010 04:46 PM, Juan Quintela wrote:
Anthony Liguori<address@hidden> wrote:
On 11/23/2010 05:03 PM, Juan Quintela wrote:
From: Juan Quintela<address@hidden>
Calculate the number of dirty pages takes a lot on hosts with lots
of memory. Just maintain how many pages are dirty. Only sync bitmaps
if number is small enough.
There needs to be numbers that justify this as part of the commit message.
They are on patch 0/6.
Additionally, with 64GB of RAM, this bitmap is HUGE, having to walk over
it in each ram_save_live() call is too onerous.
It's not so huge. It's scaled down by a factor of 8 * 4096 = 32K. So
it's a 2MB bitmap. If kept as a bitmap and accessed in longs, it can
be read in less than a millisecond.