Hi

quoted text
>  >  +       sc->nr_reclaimed += nr_reclaimed;
>  >         throttle_vm_writeout(sc->gfp_mask);
>  >  -       return nr_reclaimed;
>  >  +       return 0;
>  >   }
>
>  I am not sure this is right.
>  I might be wrong if this patch is depended on another patch.
>
>  As I see, shrink_zone always return 0 in your patch.

Yeah, this patch is just preparetion change of [4/5].
I use EAGAIN at [4/5].


quoted text
>  If it is right, I think that return value is useless. It is better
>  that we change function return type to "void"
>  Also, we have to change functions that call shrink_zone properly. ex)
>  balance_pgdat, __zone_reclaim
>  That functions still use number of shrink_zone's reclaim page

this patch is not intent by solo usage.
just intent to bisect friendly.
thus, We need implement that following patch use freature only.

Thanks!
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