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Date: Thu, 11 Jan 2018 16:04:59 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: Re: [PATCH v3] zswap: only save zswap header when necessary
Message-ID: <20180111070459.GH494@jagdpanzerIV>
References: <20180110224741.83751-1-yuzhao@google.com>
 <20180110225626.110330-1-yuzhao@google.com>
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Sender: owner-linux-mm@kvack.org
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To: Yu Zhao <yuzhao@google.com>
Cc: Dan Streetman <ddstreet@ieee.org>, Seth Jennings <sjenning@redhat.com>, Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>, Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, linux-kernel@vger.kernel.org

On (01/10/18 14:56), Yu Zhao wrote:
[..]
> We waste sizeof(swp_entry_t) for zswap header when using zsmalloc
> as zpool driver because zsmalloc doesn't support eviction.
>
> Add zpool_evictable() to detect if zpool is potentially evictable,
> and use it in zswap to avoid waste memory for zswap header.
>
> Signed-off-by: Yu Zhao <yuzhao@google.com>

looks good to me.

FWIW,
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

	-ss

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