Re: extra PG_* bits for page->flags

From: Nigel Cunningham (
Date: Mon Feb 10 2003 - 19:07:14 EST

On Tue, 2003-02-11 at 12:12, Andrew Morton wrote:
> David Howells <> wrote:
> > (*) PG_journal
> > (*) PG_journalmark
> Well. If you new fs goes in then yes, we can spare those bits (just).

May I ask, how many bits do you consider available? swsusp beta 18 (ie
2.4), which I'm beginning to port to 2.5, uses 4 bits during suspend &
resume for various purposes. If I understand the code correctly, the
zone flags use bits 24-31 (although there has been that thread saying
they could use less bits). I see in the 2.5.60 patch bit 19 is now in
use. Should I be using private, temporarily allocated bitmaps instead of
the page flags, to ease the pressure? (Especially since the suspend code
is not used in 'normal' operation anyway).



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