Re: [PATCH] mm: add the block to the tail of the list in expand()
From: Dave Hansen
Date: Mon Aug 03 2015 - 00:10:16 EST
On 08/02/2015 07:05 PM, Xishi Qiu wrote:
>> > Also, this might not do very much good in practice. If you are
>> > splitting a high-order page, you are doing the split because the
>> > lower-order lists are empty. So won't that list_add() be to an empty
>
> I made a mistake, you are right, all the lower-order lists are empty,
> so it is no sense to add to the tail.
I actually tested this experimentally and the lists are not always
empty. It's probably __rmqueue_smallest() vs. __rmqueue_fallback() logic.
In any case, you might want to double-check.
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