Re: [Lse-tech] Re: [PATCH] [0/6] HUGETLB memory commitment

From: Keith Owens
Date: Thu Mar 25 2004 - 22:43:18 EST

On Fri, 26 Mar 2004 14:28:26 +0530,
Suparna Bhattacharya <suparna@xxxxxxxxxx> wrote:
>On Thu, Mar 25, 2004 at 04:22:32PM -0800, Andrew Morton wrote:
>> Keith Owens <kaos@xxxxxxx> wrote:
>> >
>> > FWIW, lkcd (crash dump) treats hugetlb pages as normal kernel pages and
>> > dumps them, which is pointless and wastes a lot of time. To avoid
>> > dumping these pages in lkcd, I had to add a PG_hugetlb flag. lkcd runs
>This should already be fixed in recent versions of lkcd. It uses a
>little bit of trickery to avoid an extra page flag -- hugetlb pages are
>detected as "in use" as well as reserved, unlike other reserved pages
>which helps identify them.

Are you sure that this works for hugetlb pages that have been
preallocated but not yet mapped? AFAICT the hugetlb pages start off as
reserved with a zero usecount.

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