RE: [Xen-devel] [PATCH][TOOLS] Reducing impact of domainsave/restore/dump on Dom0

["Graham, Simon" <Simon.Graham@xxxxxxxxxxx>]

Take 2... this version only adds code to discard the cache on Linux and
uses the right name for the fadvise call.

It's a bit ugly - I basically just put #ifdef __linux__ around the
fadvise calls - but I don't have the ability to develop something
suitable for Solaris...

> Attached is a patch to unstable that stops save/restore/dump from
> hosing
> Dom0 when dealing with large domains - I'm actually resubmitting the
> dump patch I previously submitted in addition as it hasn't been
> incorporated yet; 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 action is done and this change, in conjunction with setting
> the
> vm.dirty_ratio sysctl parameter seems to gives very good results.
> 

Simon

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

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

Attachment: xen-dom0-cache.patch
Description: xen-dom0-cache.patch

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