On Wed, Jan 16 2013, Fengguang Wu wrote:
> Shaohua,
> 
> I tried bisect and 0d18d770b9180ffc2c3f63b9eb8406ef80105e05 is the first bad 
> commit.
> 
> commit 0d18d770b9180ffc2c3f63b9eb8406ef80105e05
> Author: Shaohua Li <s...@kernel.org>
> Date:   Sat Jan 12 10:56:05 2013 +1100
> 
>     mm: make madvise(MADV_WILLNEED) support swap file prefetch
> 
>     Make madvise(MADV_WILLNEED) support swap file prefetch.  If memory is
>     swapout, this syscall can do swapin prefetch.  It has no impact if the
>     memory isn't swapout.
> 
>     Signed-off-by: Shaohua Li <s...@fusionio.com>
>     Cc: Hugh Dickins <hu...@google.com>
>     Cc: Rik van Riel <r...@redhat.com>
>     Signed-off-by: Andrew Morton <a...@linux-foundation.org>

Unbalanced path in that patch, see this patch:

https://patchwork.kernel.org/patch/1973481/

-- 
Jens Axboe

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