Re: [LTP] [PATCH] mm/thp02: new testcase

[Caspar Z. <ca...@ca...>]

Sorry, this one is deprecated. I'll re-submit an updated version shortly.

On 09/19/2011 02:45 PM, Caspar Zhang wrote:
>
> thp02 - detect mremap bug when THP is enabled.
>
> There was a bug in mremap THP support, sometimes crash happened
> due to the following reason according to developers:
>
> "alloc_new_pmd was forcing the allocation of a pte before calling
> move_huge_page and that resulted in a VM_BUG_ON in move_huge_page
> because the pmd wasn't zero."
>
> There are 4 cases to test this bug:
>
> 1) old_addr hpage aligned, old_end not hpage aligned, new_addr
>     hpage aligned;
> 2) old_addr hpage aligned, old_end not hpage aligned, new_addr not
>     hpage aligned;
> 3) old_addr not hpage aligned, old_end not hpage aligned, new_addr
>     hpage aligned;
> 4) old_addr not hpage aligned, old_end hpage aligned, new_addr not
>     hpage aligned.
>
> Signed-off-by: Caspar Zhang<cz...@re...>
> ---
>   runtest/mm                       |    1 +
>   testcases/kernel/mem/thp/thp02.c |  133 ++++++++++++++++++++++++++++++++++++++
>   2 files changed, 134 insertions(+), 0 deletions(-)
>   create mode 100644 testcases/kernel/mem/thp/thp02.c
>