>  >  +       /* in some situation (e.g. hibernation), shrink processing shouldn't be
quoted text
>  >  +          cut off even though large memory freeded.  */
>  >  +       if (!sc->may_cut_off)
>  >  +               goto shrinking;
>  >  +
>
>  where do you initialize may_cut_off ?
>  Current Implementation, may_cut_off is always "0" so always goto shrinking

please see try_to_free_pages :)
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