From: Rik van Riel <riel@redhat.com>
To: "Huang, Ying" <ying.huang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Johannes Weiner <hannes@cmpxchg.org>,
Minchan Kim <minchan@kernel.org>, Hugh Dickins <hughd@google.com>,
Shaohua Li <shli@kernel.org>
Subject: Re: [PATCH -mm -v3 02/12] mm, THP, swap: Support to reclaim swap space for THP swapped out
Date: Tue, 25 Jul 2017 13:47:37 -0400 [thread overview]
Message-ID: <1501004857.26846.19.camel@redhat.com> (raw)
In-Reply-To: <20170724051840.2309-3-ying.huang@intel.com>
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On Mon, 2017-07-24 at 13:18 +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@intel.com>
>
> The normal swap slot reclaiming can be done when the swap count
> reaches SWAP_HAS_CACHE. But for the swap slot which is backing a
> THP,
> all swap slots backing one THP must be reclaimed together, because
> the
> swap slot may be used again when the THP is swapped out again later.
> So the swap slots backing one THP can be reclaimed together when the
> swap count for all swap slots for the THP reached SWAP_HAS_CACHE. In
> the patch, the functions to check whether the swap count for all swap
> slots backing one THP reached SWAP_HAS_CACHE are implemented and used
> when checking whether a swap slot can be reclaimed.
>
> To make it easier to determine whether a swap slot is backing a THP,
> a
> new swap cluster flag named CLUSTER_FLAG_HUGE is added to mark a swap
> cluster which is backing a THP (Transparent Huge Page). Because THP
> swap in as a whole isn't supported now. After deleting the THP from
> the swap cache (for example, swapping out finished), the
> CLUSTER_FLAG_HUGE flag will be cleared. So that, the normal pages
> inside THP can be swapped in individually.
>
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Shaohua Li <shli@kernel.org>
> Cc: Rik van Riel <riel@redhat.com>
>
Acked-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
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next prev parent reply other threads:[~2017-07-25 17:47 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-24 5:18 [PATCH -mm -v3 00/12] mm, THP, swap: Delay splitting THP after swapped out Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 01/12] mm, THP, swap: Support to clear swap cache flag for THP " Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-25 16:39 ` Rik van Riel
2017-07-24 5:18 ` [PATCH -mm -v3 02/12] mm, THP, swap: Support to reclaim swap space " Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-25 17:47 ` Rik van Riel [this message]
2017-07-24 5:18 ` [PATCH -mm -v3 03/12] mm, THP, swap: Make reuse_swap_page() works " Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 04/12] mm, THP, swap: Don't allocate huge cluster for file backed swap device Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 05/12] block, THP: Make block_device_operations.rw_page support THP Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 06/12] Test code to write THP to swap device as a whole Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 07/12] mm, THP, swap: Support to split THP for THP swapped out Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 08/12] memcg, THP, swap: Support move mem cgroup charge " Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 09/12] memcg, THP, swap: Avoid to duplicated charge THP in swap cache Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 10/12] memcg, THP, swap: Make mem_cgroup_swapout() support THP Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 11/12] mm, THP, swap: Delay splitting THP after swapped out Huang, Ying
2017-07-24 5:18 ` Huang, Ying
2017-07-24 5:18 ` [PATCH -mm -v3 12/12] mm, THP, swap: Add THP swapping out fallback counting Huang, Ying
2017-07-24 5:18 ` Huang, Ying
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