linux-kernel - Re: [PATCH] mm/zswap: add writethrough option

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Message-ID: <CALZtONCteZPFaAG0oXQGnmDocnVmpmxBeGzYMa3B_4QpGSgCvw@mail.gmail.com>
Date:	Thu, 23 Jan 2014 15:43:37 -0500
From:	Dan Streetman <ddstreet@...e.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Seth Jennings <sjennings@...iantweb.net>,
	Minchan Kim <minchan@...nel.org>,
	Linux-MM <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Bob Liu <bob.liu@...cle.com>,
	Weijie Yang <weijie.yang@...sung.com>,
	Shirish Pargaonkar <spargaonkar@...e.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] mm/zswap: add writethrough option

On Wed, Jan 22, 2014 at 3:33 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Wed, 22 Jan 2014 09:19:58 -0500 Dan Streetman <ddstreet@...e.org> wrote:
>
>> >>> > Acutally, I really don't know how much benefit we have that in-memory
>> >>> > swap overcomming to the real storage but if you want, zRAM with dm-cache
>> >>> > is another option rather than invent new wheel by "just having is better".
>> >>>
>> >>> I'm not sure if this patch is related to the zswap vs. zram discussions.  This
>> >>> only adds the option of using writethrough to zswap.  It's a first
>> >>> step to possibly
>> >>> making zswap work more efficiently using writeback and/or writethrough
>> >>> depending on
>> >>> the system and conditions.
>> >>
>> >> The patch size is small. Okay I don't want to be a party-pooper
>> >> but at least, I should say my thought for Andrew to help judging.
>> >
>> > Sure, I'm glad to have your suggestions.
>>
>> To give this a bump - Andrew do you have any concerns about this
>> patch?  Or can you pick this up?
>
> I don't pay much attention to new features during the merge window,
> preferring to shove them into a folder to look at later.  Often they
> have bitrotted by the time -rc1 comes around.
>
> I'm not sure that this review discussion has played out yet - is
> Minchan happy?

I think so, or at least ok enough to not block it, but please correct
me if I am wrong, Minchan.

>
> Please update the changelog so that it reflects the questions Minchan
> asked (any reviewer question should be regarded as an inadequacy in
> either the code commenting or the changelog - people shouldn't need to
> ask the programmer why he did something!) and resend for -rc1?

OK I'll update and resend.
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