Re: swsusp: 8-order allocation failure on demand (update)

[Pavel Machek <pavel@suse.cz>]

Hi!

> > > > Unfortunately that's rather ugly. You'd ~32 bytes per 4K page, that's
> > > > almost 1% overhead, not nice. Better solution (but more work) is to
> > > > switch to link-lists or integrate swsusp2.
> > > 
> > > Well, I wonder if the page allocation failures are a swsusp problem,
> > > really.  
> > 
> > Yes, they are. Kernel memory allocation is not design to do 8-order
> > allocations properly. swsusp really should not use them.
> 
> Now that's clear, thanks.  Could you tell me, please, what I need to know to 
> understand the swsusp code and what I should start with?

On bootup, prealloc, say, order-9 alocation.

In alloc_pagedir(), do not allocate anything, but check that data fit
in preallocated area, and fail if not.

There's free_pages( pagedir_save, ...) somewhere, remove that so
pagedir is never freed and you can resume multiple times.
								Pavel
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