linux-kernel - Re: [PATCH -mm -v3 01/12] mm, THP, swap: Support to clear swap cache flag for THP swapped out

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Message-ID: <1501000754.26846.18.camel@redhat.com>
Date:   Tue, 25 Jul 2017 12:39:14 -0400
From:   Rik van Riel <riel@...hat.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>
Subject: Re: [PATCH -mm -v3 01/12] mm, THP, swap: Support to clear swap
 cache flag for THP swapped out

On Mon, 2017-07-24 at 13:18 +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@...el.com>
> 
> Previously, swapcache_free_cluster() is used only in the error path
> of
> shrink_page_list() to free the swap cluster just allocated if the
> THP (Transparent Huge Page) is failed to be split.  In this patch, it
> is enhanced to clear the swap cache flag (SWAP_HAS_CACHE) for the
> swap
> cluster that holds the contents of THP swapped out.
> 
> This will be used in delaying splitting THP after swapping out
> support.  Because there is no THP swapping in as a whole support yet,
> after clearing the swap cache flag, the swap cluster backing the THP
> swapped out will be split.  So that the swap slots in the swap
> cluster
> can be swapped in as normal pages later.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Shaohua Li <shli@...nel.org>
> Cc: Rik van Riel <riel@...hat.com>
> 

Acked-by: Rik van Riel <riel@...hat.com>

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