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Date: Wed, 30 Jan 2008 15:02:14 +0530 From: Ciju Rajan K <ciju@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org CC: William Lee Irwin III <wli@...omorphy.com>, aglitke <agl@...ibm.com> Subject: Re: [RFC] [PATCH] hugetlbfs :shmget with SHM_HUGETLB only works as root Ciju Rajan K wrote: > 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@...ux.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: > + > +@...egroup soft memlock 2097152 > +@...egroup hard memlock 2097152 > + > +Otherwise, you may manipulate the locked limit command directly with > 'ulimit'. > +See its man page for more information. > + > ******************************************************************* > > /* > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > Wli, Can this patch be included in the hugepage documentation? Thanks Ciju -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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