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SubjectRe: weird DirectMap2M accounting.
On Wed, 6 Jan 2016, Dave Jones wrote:
> On Wed, Jan 06, 2016 at 07:11:41PM -0500, Dave Jones wrote:
> > On Wed, Jan 06, 2016 at 06:55:27PM -0500, Dave Jones wrote:
> > > I just spotted this in /proc/meminfo on an old Core2 machine with 4G.
> > >
> > > DirectMap2M: 18446744073709543424 kB
> > >
> > > Looks like we subtracted 8192 from 0 somewhere.
> > >
> > > Should split_page_count() be checking that direct_pages_count > 0 ?
> >
> > Ok, this diff makes that number print out as 0.
> >
> > If this looks ok, I'll submit it properly, though I'd like to better
> > understand what's happening here. Shouldn't I have 2M pages ?
>
> Ah. We disable them when compiling with DEBUG_PAGEALLOC.
> So this is only needed in that case.
> If people think it's worth an ifdef for those two added lines I'll add it,
> but it seems pretty benign to just always check.

Agreed.

tglx

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