On Mon, 07 Aug 2006 11:39:27 -0700
keith mannthey <[email protected]> wrote:
> On Sat, 2006-08-05 at 14:51 +0900, KAMEZAWA Hiroyuki wrote:
> > On Fri, 4 Aug 2006 07:13:51 -0600
> > Keith Mannthey <[email protected]> wrote:
> > > I have worked to integrate the feedback I recived on the last round of patches
> > > and welcome more ideas/advice. Thanks to everyone who has provied input on
> > > these patches already.
> > >
> > Just from review...
> >
> > If new zone , which was empty at boot, are added into the system.
> > build_all_zonelists() has to be called. (see online_pages() in memory_hotplug.c)
> > it looks x86_64's __add_pages() doesn't calles it.
>
> With RESERVE there are not empty zones. All zones (including add-areas)
> are setup during boot and hot add areas reserved in the bootmem
> allocator.
>
> Zones don't change size there is no adding to the zone just on-lining on
> pages at are already present in the zone.
>
Hmm, curious.
please explain.
==
int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages)
{
int err = -EIO;
unsigned long pfn;
unsigned long total = 0, mem = 0;
for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) {
if (pfn_valid(pfn)) {
online_page(pfn_to_page(pfn));
err = 0;
mem++;
}
total++;
}
if (!err) {
z->spanned_pages += total;
z->present_pages += mem; -------------------------------(*)
z->zone_pgdat->node_spanned_pages += total;
z->zone_pgdat->node_present_pages += mem;
}
return err;
}
==
It looks contents of zone is increased at (*). Do I see old code ?
==
static inline int populated_zone(struct zone *zone)
{
return (!!zone->present_pages);
}
==
"empty zone" I said means a zone which is not populated.
this populated_zone() is used at build_zone_list().
if populated_zone(z)==0, zone "z" is not included into zonelist and zone will be never
used.
-Kame
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