Re: [PATCH 18/31] powerpc/mm: Increase the pte frag size.
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2015-09-21 08:14:59
On Mon, 2015-09-21 at 12:10 +0530, Aneesh Kumar K.V wrote:
/* - * We use a 2K PTE page fragment and another 2K for storing - * real_pte_t hash index + * We use a 2K PTE page fragment and another 4K for storing + * real_pte_t hash index. Rounding the entire thing to 8K */
Isn't this a LOT of memory wasted ? Page tables have a non-negligible footprint, we were already wasting half, now we are wasting 3/4 no ? Ie, in most cases on modern machines we never use the other "half"... Ben.