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

From: Keith Owens <>
Date: 2004-03-26 14:39:09
On Fri, 26 Mar 2004 14:28:26 +0530, 
Suparna Bhattacharya <> wrote:
>On Thu, Mar 25, 2004 at 04:22:32PM -0800, Andrew Morton wrote:
>> Keith Owens <> 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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Received on Thu Mar 25 22:53:34 2004

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