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Date: Wed, 29 Mar 2017 12:55:22 -0400 From: Johannes Weiner <hannes@...xchg.org> To: "Huang, Ying" <ying.huang@...el.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>, Minchan Kim <minchan@...nel.org>, Rik van Riel <riel@...hat.com> Subject: Re: [PATCH -mm -v7 1/9] mm, swap: Make swap cluster size same of THP size on x86_64 On Tue, Mar 28, 2017 at 01:32:01PM +0800, Huang, Ying wrote: > @@ -499,6 +499,19 @@ config FRONTSWAP > > If unsure, say Y to enable frontswap. > > +config ARCH_USES_THP_SWAP_CLUSTER > + bool > + default n This is fine. > +config THP_SWAP_CLUSTER > + bool > + depends on SWAP && TRANSPARENT_HUGEPAGE && ARCH_USES_THP_SWAP_CLUSTER > + default y > + help > + Use one swap cluster to hold the contents of the THP > + (Transparent Huge Page) swapped out. The size of the swap > + cluster will be same as that of THP. But this is a super weird thing to ask the user. How would they know what to say, if we don't know? I don't think this should be a config knob at all. Merge the two config items into a simple config THP_SWAP_CLUSTER bool default n and let the archs with reasonable THP sizes select it.
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