Re: shmget with SHM_HUGETLB flag: Operation not permitted

[William Lee Irwin III]

William Lee Irwin III wrote:
>>Check /proc/sys/vm/nr_hugepages and /proc/sys/kernel/shmmax also.

On Fri, Feb 27, 2004 at 02:33:08AM +0100, Jochen Roemling wrote:
> cat /proc/sys/vm/nr_hugepages
> 64

256MB limit there.


On Fri, Feb 27, 2004 at 02:33:08AM +0100, Jochen Roemling wrote:
> cat /proc/sys/kernel/shmmax
> 33554432

32MB limit there.


On Fri, Feb 27, 2004 at 02:33:08AM +0100, Jochen Roemling wrote:
> cat /proc/meminfo | grep Huge
> HugePages_Total:    64
> HugePages_Free:     62
> Hugepagesize:     4096 kB
> but again: root can, users cannot, so sizes won't matter, would they?

It's capable(CAP_IPC_LOCK) || in_group_p(0), not current->uid == 0.
It will barf if you ask for more than either one of those limits. It
will also barf if you ask for an amount not a multiple of the hugepage
size. Please show the test program's code and strace the test program
to determine what response it's getting.


-- wli
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