At 2011-06-10 09:28:52，"David Gibson" <da...@gibson.dropbear.id.au> wrote:
>On Thu, Jun 09, 2011 at 04:50:50PM +0800, bill wrote:
>> Hi, guys:)
>>
>>
>> In order to run a program based on huge page, either insert PF_LINUX_HUGETLB
>> in
>> program header or by setting HUGETLB_ELFMAP env.
>>
>> while testcases such as linkhuge/xB.linkhuge/xBDT.linkhuge don't meet neither
>> conditions mentioned above, so running them will using normal 4k
>> huge page.
>
>The xB.linkhuge and xBDT.linkhuge testcases should have the
>PF_LINUX_HUGETLB flag in at least some of the program headers. If
>they don't then something is wrong with the link process for them.
>
>Note, however, that the program header flag based relinking method is
>rather fragile, and can easily break when the binutils version
>changes. That's why the HUGETLB_ELFMAP=R|W method is the newer,
>preferred method.
Thanks for your reply.
Both X86 and ARM ld version in my side is newer than 2.18.
iamroot@iamroot-OptiPlex-780:~/workbench/private/hugetlb/libhugetlbfs-2.11/tests$
ld -v
GNU ld (GNU Binutils for Ubuntu) 2.20.51-system.20100908
-bash-3.2$arm-wrs-linux-gnueabi-ld -v
GNU ld (Linux Sourcery G++ 4.4a-328) 2.19.51.20090709
Do you mean the PF_LINUX_HUGETLB is set by the linker?
Maybe my arm porting libhugetlbfs is buggy, but I don't see any such flag in
xB.linkhuge on X86 either.
bill
>
>> As a result:
>> ./linkhuge PASS
>> because there is no linkstring.
>>
>> LD_PRELOAD=libhugetlbfs.so ./linkhuge PASS
>> because there is no linkstring.
>>
>> ./xB.linkhuge FAIL
>> Not mapping in huge page
>>
>>
>> HUGETLB_ELFMAP=no xB.linkhuge PASS
>> because elfmap_inhibited is set on.
>>
>> I test these four cases in X86/ARM, they have the same result.
>> so did I misunderstand something
>> import?
>>
>> Please correct me if I am wrong.
>>
>>
>> Thanks
>>
>>
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>
>--
>David Gibson | I'll have my music baroque, and my code
>david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
> | _way_ _around_!
>http://www.ozlabs.org/~dgibson
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