linux-kernel - Re: [PATCH v11 07/14] HMM: mm add helper to update page table when migrating memory v2.

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Message-ID: <062101d10cae$91d986d0$b58c9470$@alibaba-inc.com>
Date:	Thu, 22 Oct 2015 17:46:47 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	Jérôme Glisse <jglisse@...hat.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v11 07/14] HMM: mm add helper to update page table when migrating memory v2.

> 
> This is a multi-stage process, first we save and replace page table
> entry with special HMM entry, also flushing tlb in the process. If
> we run into non allocated entry we either use the zero page or we
> allocate new page. For swaped entry we try to swap them in.
> 
Please elaborate why swap entry is handled this way.

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