[Xen-devel] Suspending cached pages

[Sean Atkinson <sean@xxxxxxxxxxxxxx>]

Hi,

I used the demo CD to test suspending a domain to disk, hoping to
migrate suspended domains between Xen machines.  The domain reported
62940 kB total memory in /proc/meminfo, with 29800 cached.  This happily
suspended to a 22965k gzip file, which expands to 65610k when
decompressed.

Am I right in thinking that the cache pages were be included, and if so
are there any thoughts on removing them?

I seem to recall that before swsusp actually starts its suspension of
memory to disk scripts prepare the machine state and cache pages are not
written out.  This means that full performance isn't returned
immediately after resumption, but presumably it's just as fast to
re-read the cache back from files on disk rather than pages from a
suspend file, and it minimises machine state.

Cheers,

Sean.

-- 
Sean Atkinson <sean@xxxxxxxxxxxxxx>
Netproject



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