Hi!
> > > With the code I have in Suspend2 (which is what I'm working towards),
> > > the value includes the swap_type, so there's no overlap. Assuming the
> > > swap allocator does it's normal thing and swap allocated is contiguous,
> > > you'll probably end up with two extents: one containing the swap
> > > allocated on the first device, and the other containing the swap
> > > allocated on the second device. So (with the current version), striping
> > > would use 6 * sizeof(unsigned long) instead of 3 * sizeof(unsigned
> > > long).
> >
> > And now, can you do same computation assuming the swap allocator goes
> > completely crazy, and free space is in 1-page chunks?
>
> The worst case is 3 * sizeof(unsigned long) *
> number_of_swap_extents_allocated bytes.
Okay, so if we got 4GB of swap space, thats 1MB swap pages, worst case
is you have one extent per page, on x86-64 that's 24MB. +kmalloc
overhead, I assume?
And you do linear walks over those extents, leading to O(n^2)
algorithm, no? That has bitten us before...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
