Messages in this thread | | | Date | Thu, 25 Mar 2004 16:27:49 +0100 | From | Jens Axboe <> | Subject | Re: swsusp with highmem, testing wanted |
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On Thu, Mar 25 2004, Pavel Machek wrote: > Hi! > > > > I actually ran it on real 2GB machine, and it seemed to do the trick, > > > unless "too much" memory was full. > > > > Well your patch really looked nothing more than a nasty hack, since it > > has known and very real failures. Why do you need to copy all highmem > > down to low mem? That cannot _ever_ work reliably?! > > Because it is only solution I know that does not require rewriting half > the kernel or rewriting all the block drivers. (see how swsusp already > does copy of lowmem).
I don't understand, why would you need to rewrite block drivers?! Either way, your patch surely is a bad idea no matter what way you look at it.
> Having special "poll" mode for block drivers might do the trick, but > thats lot of work.
Maybe I'm missing something, but why doesn't the regular io paths work?
> Which operations are allowed to access highmem? Can I rely on > block device read/write not accessing highmem?
You mean modify highmem pages, or?
-- Jens Axboe
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