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Re: Reserving a bit in ELF segment flags for huge page mappings

From: Sriraman Tallam <tmsriram at google dot com>
To: Cary Coutant <ccoutant at google dot com>
Cc: Michael Matz <matz at suse dot de>, Jan Hubicka <jh at suse dot cz>, gcc at gcc dot gnu dot org, binutils <binutils at sourceware dot org>, Ian Lance Taylor <iant at google dot com>
Date: Wed, 25 Jul 2012 11:29:17 -0700
Subject: Re: Reserving a bit in ELF segment flags for huge page mappings
References: <CAAs8HmwtgLkz7zL=65=CBseFsMZfw=KzSZtWDptuVE9Yr0y8Kg@mail.gmail.com> <CAHACq4pqaWiHYxDcZRqAtV2iurhOATTW4Q=eNZZyY880G=MdJg@mail.gmail.com>

On Tue, Jul 24, 2012 at 1:40 PM, Cary Coutant <ccoutant@google.com> wrote:
>>   To do this, I would like to reserve a bit in the segment flags to
>> indicate that this segment is to be mapped to huge pages if possible.
>> Can I reserve something like a PF_LARGE_PAGE bit?
>
> HP-UX has a PF_HP_PAGE_SIZE (0x00100000) bit that says "Segment should
> be mapped with page size specified in p_align field".

Ok to define PF_LINUX_PAGE_SIZE similarly, same bit (0x00100000) ? I
want this to be a hint to the loader.

Thanks,
-Sri.

>
> -cary

References:
- Reserving a bit in ELF segment flags for huge page mappings
  - From: Sriraman Tallam
- Re: Reserving a bit in ELF segment flags for huge page mappings
  - From: Cary Coutant

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