On Wed, Jul 14, 2010 at 7:33 AM, Murlin Wenzel <[email protected]> wrote:
>>>> On 7/14/2010 at 07:03 AM, in message
> <1263127425.237831279112632038.javamail.r...@zmail04.collab.prod.int.phx2.redhat
> com>, Caspar Zhang <[email protected]> wrote:
>> Hi all, I find a FAIL result in syscalls/swapon03 with RHEL6 kernel,
>> on a x86_64 machine, it always fails with the following message:
>>
>> swapon03 1 TFAIL : Failed swapon for file swapfile30: errno=EPERM(1):
>> Operation not permitted
>> swapon03 1 TFAIL : Failed to setup swaps
>>
>> This is because in some >=2.6.32 kernels, the
>> CONFIG_MEMORY_FAILURE option is enabled by default in kernel.
>> As the NOTES in man 2 swapon says:
>>
>> "...Since kernel 2.6.32, the limit is decreased by 1 if the kernel is built
>> with the CONFIG_MEMORY_FAILURE option..."
>>
>
> That's not the only option that affects MAX_SWAPFILES now.
>
>> so MAX_SWAPFILES is not 30 anymore, it's 29. While LTP defines MAX_SWAPFILES
>> to 30 in include/swaponoff.h(hmmm....hardcode, I don't think it's a good
>> idea :-|).
>>
>> So the way to solve(maybe) the problem is clear: change MAX_SWAPFILES
>> to 29 when CONFIG_MEMORY_FAILURE is enabled. My question is: is there
>> a good way to check whether a kernel option is enabled or not? I searched
>> in the old discussions in this maillist and found nothing. I want to know if
>>
>> the developers have some new ideas?
>>
>
> I've seen 28 as the MAX as well, it all depends on the config options. I've
> been looking at re-architecting the test to do some sort of repeat test to
> the max number of successful swap creations and then verifying that the same
> number is reachable at least 2 times. MAX_SWAPFILES is never exported to
> userspace. It's a compile time #define that depends on the kernel config
> options.
What about /proc/config.gz (or something similar)? Seems like a
simple enough thing to check for absolute clarity... don't remember
the kernel option for that though.
Cheers,
-Garrett
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