Hi,
You can try by passing the flag GFP_KERNEL to __get_free_pages().
Eg: __get_free_pages(GFP_KERNEL,9) where "9" represents - Order of 9; means
requesting for 2^9(=512) contiguous pages in virtual address space
in order to allocate 2MB of contiguous memory.
Thanks & Regards
Murali
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Subject: Kernelnewbies Digest, Vol 21, Issue 13
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Today's Topics:
1. Re: How to allocate hugepage in kernel module? (J.Hwan Kim)
2. Re: How to allocate hugepage in kernel module? (anish kumar)
----------------------------------------------------------------------
Message: 1
Date: Fri, 10 Aug 2012 09:00:12 +0900
From: "J.Hwan Kim" <[email protected]>
Subject: Re: How to allocate hugepage in kernel module?
To: Denis Kirjanov <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8; format=flowed
I set the __GFP_COMP flag to __get_free_pages(), but the result was same.
2012? 08? 09? 17:59, Denis Kirjanov ? ?:
> Forgot to CC kernelnewbies:
>
> Did you pass the __GFP_COMP flag to __get_free_pages?
>
>
> On 8/9/12, J.Hwan Kim<[email protected]> wrote:
>> Hi, everyone
>>
>> How can I allocate physically contiguous huge page in kernel module ?
>> The routine of _get_fee_pages() fails whenever there are much free
>> memory in system.
>>
>> I found the procedures for set hugepages with sysctl or
>> /proc/sys/vm/nr_hugepages but I've not found the api for allocate the
>> huge page in kernel.
>>
>> Thanks in advnace.
>>
>> Best Regards,
>> J.Hwan Kim
>>
>>
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> [email protected]
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
------------------------------
Message: 2
Date: Thu, 09 Aug 2012 20:18:02 -0700
From: anish kumar <[email protected]>
Subject: Re: How to allocate hugepage in kernel module?
To: "J.Hwan Kim" <[email protected]>
Cc: Denis Kirjanov <[email protected]>,
[email protected]
Message-ID: <1344568682.1532.30.camel@anish-Inspiron-N5050>
Content-Type: text/plain; charset="UTF-8"
On Fri, 2012-08-10 at 09:00 +0900, J.Hwan Kim wrote:
> I set the __GFP_COMP flag to __get_free_pages(), but the result was
> same.
Does this help?
sourd/core/memalloc.c +170
> 2012? 08? 09? 17:59, Denis Kirjanov ? ?:
> > Forgot to CC kernelnewbies:
> >
> > Did you pass the __GFP_COMP flag to __get_free_pages?
> >
> >
> > On 8/9/12, J.Hwan Kim<[email protected]> wrote:
> >> Hi, everyone
> >>
> >> How can I allocate physically contiguous huge page in kernel module ?
> >> The routine of _get_fee_pages() fails whenever there are much free
> >> memory in system.
> >>
> >> I found the procedures for set hugepages with sysctl or
> >> /proc/sys/vm/nr_hugepages but I've not found the api for allocate
> >> the huge page in kernel.
> >>
> >> Thanks in advnace.
> >>
> >> Best Regards,
> >> J.Hwan Kim
> >>
> >>
> >>
> >> _______________________________________________
> >> Kernelnewbies mailing list
> >> [email protected]
> >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> >>
> >
>
>
> _______________________________________________
> Kernelnewbies mailing list
> [email protected]
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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