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

[Xen-devel] [PATCH] [TOOLS] Reducing impact of domain dump on Dom0

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Graham, Simon" <Simon.Graham@xxxxxxxxxxx>
  • Date: Wed, 7 Feb 2007 21:39:02 -0500
  • Delivery-date: Wed, 07 Feb 2007 18:38:40 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdKt698SbXeXfWqTtmH3e6f+Gy00AAAEe9AABwuBMA=
  • Thread-topic: [PATCH] [TOOLS] Reducing impact of domain dump on Dom0

Thanks to all the suggestions, I have a *much* cleaner (and more PC)
version of the patch to improve the impact of doing dumps of large
DomUs; this is based on using fadvise64(DONTNEED) to throw the page
cache away once it has been written to disk -- with this in place,
memory usage does go up somewhat but then immediately drops again when
the dump is done and this change, in conjunction with setting the
vm.dirty_ratio sysctl parameter seems to gives very good results.

So - attached is a patch that helps dump performance -- I'll send
save/restore separately based on the same approach.


Reduce impact of dumping large domains on Dom0 memory usage by means of
fadvise64() to tell
the OS to discard the cache pages used for the dump file.

Signed-off-by: Simon Graham <Simon.Graham@xxxxxxxxxxx>

Attachment: xen-dump-cache.patch
Description: xen-dump-cache.patch

Xen-devel mailing list



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