lkml.org 
[lkml]   [2018]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v25 1/2 RESEND] mm: support reporting free page blocks
On Thu, 25 Jan 2018 17:38:27 +0800 Wei Wang <wei.w.wang@intel.com> wrote:

> This patch adds support to walk through the free page blocks in the
> system and report them via a callback function. Some page blocks may
> leave the free list after zone->lock is released, so it is the caller's
> responsibility to either detect or prevent the use of such pages.
>
> One use example of this patch is to accelerate live migration by skipping
> the transfer of free pages reported from the guest. A popular method used
> by the hypervisor to track which part of memory is written during live
> migration is to write-protect all the guest memory. So, those pages that
> are reported as free pages but are written after the report function
> returns will be captured by the hypervisor, and they will be added to the
> next round of memory transfer.

It would be useful if we had some quantitative testing results, so we
can see the real-world benefits from this change?

\
 
 \ /
  Last update: 2018-01-25 23:41    [W:0.034 / U:0.532 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site