Re: extra PG_* bits for page->flags

[Nigel Cunningham]

On Tue, 2003-02-11 at 12:12, Andrew Morton wrote:
> David Howells <[e-mail]> 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).

Regards,

Nigel