linux-kernel - Re: [PATCH v12 02/11] mm, swap: Add infrastructure for saving page metadata on swap

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Message-Id: <20180306144757.8b1b4967bce500fca9bb6083@linux-foundation.org>
Date:   Tue, 6 Mar 2018 14:47:57 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     davem@...emloft.net, dave.hansen@...ux.intel.com, arnd@...db.de,
        kirill.shutemov@...ux.intel.com, mhocko@...e.com,
        ross.zwisler@...ux.intel.com, dave.jiang@...el.com,
        mgorman@...hsingularity.net, willy@...radead.org, hughd@...gle.com,
        minchan@...nel.org, hannes@...xchg.org, shli@...com,
        mingo@...nel.org, jglisse@...hat.com, me@...in.cc,
        anthony.yznaga@...cle.com, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        sparclinux@...r.kernel.org, Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [PATCH v12 02/11] mm, swap: Add infrastructure for saving page
 metadata on swap

On Wed, 21 Feb 2018 10:15:44 -0700 Khalid Aziz <khalid.aziz@...cle.com> wrote:

> If a processor supports special metadata for a page, for example ADI
> version tags on SPARC M7, this metadata must be saved when the page is
> swapped out. The same metadata must be restored when the page is swapped
> back in. This patch adds two new architecture specific functions -
> arch_do_swap_page() to be called when a page is swapped in, and
> arch_unmap_one() to be called when a page is being unmapped for swap
> out. These architecture hooks allow page metadata to be saved if the
> architecture supports it.
> 
> Signed-off-by: Khalid Aziz <khalid.aziz@...cle.com>
> Cc: Khalid Aziz <khalid@...ehiking.org>
> Acked-by: Jerome Marchand <jmarchan@...hat.com>
> Reviewed-by: Anthony Yznaga <anthony.yznaga@...cle.com>

Acked-by: Andrew Morton <akpm@...ux-foundation.org>