Messages in this thread Patch in this message | | | Date | Tue, 29 Jan 2008 20:28:03 +0530 | From | Ciju Rajan K <> | Subject | Re: [RFC] [PATCH] hugetlbfs :shmget with SHM_HUGETLB only works as root |
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William Lee Irwin III wrote: > On Fri, Nov 30, 2007 at 12:02:32AM +0530, Ciju Rajan K wrote: >> I tested your patch. But that is not solving the problem. >> If the code change to user_shm_lock() is not a good solution, could >> you please suggest a method so that the normal user is able to allocate >> the huge pages, if his gid is added to /proc/sys/vm/hugetlb_shm_group > > The patch I posted resolves a race unrelated to your issue. Raising your > locked memory limits should not be difficult. /etc/limits.conf or similar > should set it up for you. You can also change the default rlimit in the > kernel and compile it with default limits elevated to what you want your > unprivileged process to have to start with if you're truly having lots > of trouble getting userspace to set the default limits properly. I'd > look in include/asm-generic/resource.h > > > -- wli
Hi Wli,
The documentation available in the kernel for huge pages does not talk about the issue associated with locked memory limit. I think it would be helpful to the users if we mention about this in the documentation. I am attaching a small documentation patch.
Thanks Ciju
Signed-off-by: Ciju Rajan (ciju@linux.vnet.ibm.com) --- --- Documentation/vm/hugetlbpage.txt.orig 2008-01-24 16:42:40.000000000 +0530 +++ Documentation/vm/hugetlbpage.txt 2008-01-29 19:36:45.000000000 +0530 @@ -108,6 +108,18 @@ a supplementary group and system admin n applications to use any combination of mmaps and shm* calls, though the mount of filesystem will be required for using mmap calls.
+Note: The default locked limit in the kernel is just 32KB. If the normal +user whose gid is present in the file /proc/sys/vm/hugetlb_shm_group needs +more memory than this, the default limit must be increased. If pam is installed +on your system, resource limits can be configured by installing lines similar +to the following in /etc/security/limits.conf: + +@hugegroup soft memlock 2097152 +@hugegroup hard memlock 2097152 + +Otherwise, you may manipulate the locked limit command directly with 'ulimit'. +See its man page for more information. + *******************************************************************
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