Re: change of behavior for madvise in 3.9-rc1

[Shaohua Li]

On Wed, Mar 06, 2013 at 11:05:04PM -0500, CAI Qian wrote:
> Bisecting indicated that this commit,
> 1998cc048901109a29924380b8e91bc049b32951
> mm: make madvise(MADV_WILLNEED) support swap file prefetch
> 
> Caused an LTP test failure,
> http://goo.gl/1FVPy
> 
> madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
> madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
> madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
> madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12): Cannot allocate memory
> madvise02    5  TFAIL  :  madvise succeeded unexpectedly
> 
> While it passed without the above commit
> madvise02    1  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
> madvise02    2  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
> madvise02    3  TPASS  :  failed as expected: TEST_ERRNO=EINVAL(22): Invalid argument
> madvise02    4  TPASS  :  failed as expected: TEST_ERRNO=ENOMEM(12): Cannot allocate memory
> madvise02    5  TPASS  :  failed as expected: TEST_ERRNO=EBADF(9): Bad file descriptor

I thought this is expected behavior. madvise(MADV_WILLNEED) to anonymous memory
doesn't return -EBADF now, as now we support swap prefretch.

Thanks,
Shaohua
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/