On Pá 03-02-06 10:20:42, Nigel Cunningham wrote:
> Hi.
>
> On Friday 03 February 2006 08:10, Rafael J. Wysocki wrote:
> > On machines with less RAM suspend2 will probably be better
> > preformance-wise, and that may be more important than the flexibility.
>
> Ok. So I bit the bullet and downloaded -mm4 to take a look at this interface
> you're making, and I have a few questions:
Great, thanks.
> - It seems to be hardwired to use swap, but you talk about writing to a
> network image above. In Suspend2, I just bmap whatever the storage is, and
> then submit bios to read and write the data. Is anything like that possible
> with this interface? (Could it be extended if not?)
No, it is not hardwired. There's special swap support, but you do not
need to use it.
> - Is there any way you could support doing a full image of memory with this
> approach? Would you take patches?
Doing full image is certainly possible; it is not important if kernel
does the writing or userspace does it. Taking patches definitely
depends how they'd look like...
> - Does the data have to be transferred to userspace? Security and efficiency
> wise, it would seem to make a lot more sense just to be telling the kernel
> where to write things and let it do bio calls like I'm doing at the
> moment.
As far as I can see, transfering data to userspace and back does not
really cost much:
pavel@amd:~$ time head -c $[1024*1024*1024] < /dev/zero > /dev/null
0.16user 0.27system 0.43 (0m0.439s) elapsed 100.00%CPU
...2000MB/sec is the limit (thinkpad x32).
Pavel
--
Thanks, Sharp!
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