please add support for MAP_HUGETLB in eglibc for Lucid

[Leonardo Borda]

it looks like eglibc on 10.04 does not have MAP_HUGETLB headers or flags activated [1].

According to hugetlbpage.txt [2] they state that if the application is making use of only (shmget, shmat) calls you don't really
need a virtual filesystem. This behaviout *DOES NOT* happen on 10.04 using the released hugepages 10.04 packages but it DOES WORK when using precise packages.

[Impact]
Those wishing utilize hugepages on Lucid.

[Test Case]
Here are some steps to reproduce the issue.

1. Configure hugepages with filesystem support.
2. Test and validate that it works with 10.04 packages.
3. Umount the virtual filesystem
sudo umount /mnt/hugetlbfs
4. run:
LD_PRELOAD=libhugetlbfs.so HUGETLB_MORECORE=yes ls /boot
You will get the following error message:
libhugetlbfs: WARNING: Hugepage size 2097152 unavailable
abi-2.6.32-43-server grub lost+found System.map-2.6.32-43-server vmlinuz-2.6.32-43-server

5. Download hugepages packages from:
https://launchpad.net/ubuntu/+source/libhugetlbfs/2.11-0ubuntu1/+build/2263743 and install them.

6. Try again. It should work without having to configure a virtual filesystem.

[1] - http://old.nabble.com/Missing-MAP_HUGETLB-flag-from-glibc-headers-td30201924.html
[2] - http://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt

Leonardo Borda

[Regressioni Potential]
Huge page support is already in the kernel so this impact is merely making use of that functionality. There should be no changes needed in current applications since hugepages can be used through existing shmget,shmat routines.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Adam Conrad (adconrad)]

I have hugetlbfs test packages for this at: http://people.canonical.com/~adconrad/hugetlb/

If those fix the problem satisfactorily, I'll upload them to lucid-backports, and hold off on the 1-liner to eglibc until there are a few more lucid bugs worth uploading a glibc SRU for.

[Adam Stokes (adam-stokes)]

Hi Adam,

I've had someone independently test your packages and was reported as successful. We would like to see this in lucid-backports when you get some cycles to do so.

Thanks!

[Dimitri John Ledkov (xnox)]

Unsubscribing Ubuntu Sponsors, as the current situation has been agreed to not upload eglibc debdiff.

[Scott Kitterman (kitterman)]

Ack from Ubuntu Backporters.

[Scott Kitterman (kitterman)]

Accepted into lucid-backports.

[Leonardo Borda (lborda)]

Thanks Adam(x2), Scott

Leonardo Borda

[Rolf Leggewie (r0lf)]

lucid has seen the end of its life and is no longer receiving any updates. Marking the lucid task for this ticket as "Won't Fix".