On Fri, Aug 05, 2016 at 12:55:26PM +0100, Mel Gorman wrote:
> On Fri, Aug 05, 2016 at 11:52:57AM +0100, James Hogan wrote:
> > > What's surprising is that it worked for the zone stats as it appears
> > > that calling zone_reclaimable() from that context should also have
> > > broken. Did anything change recently that would have avoided the
> > > zone->pageset dereference in zone_reclaimable() before?
> > 
> > It appears that zone_pcp_init() was already setting zone->pageset to
> > &boot_pageset, via paging_init():
> > 
> 
> /me slaps self
> 
> Of course.
> 
> > > The easiest option would be to not call show_mem from arch code until
> > > after the pagesets are setup.
> > 
> > Since no other arches seem to do show_mem earily during boot like metag,
> > and doing so doesn't really add much value, I'm happy to remove it
> > anyway.
> > 
> 
> Thanks. Can I assume you'll merge such a patch or should I roll one?

Yep, I'll take care of it.

> 
> > However could your change break other things and need fixing anyway?
> > 
> 
> Not that I'm aware of. There would have to be a node-based stat that has
> meaning that early in boot to have an effect. If one happened to added
> then it would need fixing but until then the complexity is unnecessary.

Okay, thanks for the help,

Cheers
James