Re: Reserved page flaging of 2.4 kernel memory changed recently?

[Michael Frank]

On Thu, 19 Feb 2004 08:26:30 +0100, Pavel Machek <pavel@xxxxxxx> wrote:

> Hi!

mhf wrote:

> > I actually would like to rename the bit PG_nosave to PG_donttouch ;)

to make a point with regard to:

	no transfer of page contents during suspend/resume
	no netdump
	no debugger access without override

... but the name does not matter and we do not have to change it.

> Its used for swsusp internal data, too...

Yes of course - how else would swsusp run, but these data are also not  
"touched"
during suspend and resume wrt transfer of page content.

x86 Pages for PG_nosave:

Video/BIOS 0xA0000-0XFFFFF
Anything reserved < max_pfn
Pentium 2 broken highmem pages
Driver specific areas in DMA zone are also thinkable

.. or else you get mce's or possibly crashes on newer x86 HW and on 64Bit  
for sure.
	- we had a mce recently at 0xa0000 on a Athlon XP and I went digging...

Regards
Michael

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