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Date: Fri, 3 Mar 2017 11:11:18 +0900
From: Minchan Kim <minchan@kernel.org>
To: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, kernel-team@lge.com,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.com>
Subject: Re: [RFC 00/11] make try_to_unmap simple
Message-ID: <20170303021118.GA3503@bbox>
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Hi Anshuman,

On Thu, Mar 02, 2017 at 07:52:27PM +0530, Anshuman Khandual wrote:
> On 03/02/2017 12:09 PM, Minchan Kim wrote:
> > Currently, try_to_unmap returns various return value(SWAP_SUCCESS,
> > SWAP_FAIL, SWAP_AGAIN, SWAP_DIRTY and SWAP_MLOCK). When I look into
> > that, it's unncessary complicated so this patch aims for cleaning
> > it up. Change ttu to boolean function so we can remove SWAP_AGAIN,
> > SWAP_DIRTY, SWAP_MLOCK.
> 
> It may be a trivial question but apart from being a cleanup does it
> help in improving it's callers some way ? Any other benefits ?

If you mean some performace, I don't think so. It just aims for cleanup
so caller don't need to think much about return value of try_to_unmap.
What he should consider is just "success/fail". Others will be done in
isolate/putback friends which makes API simple/easy to use.

Thanks.

> 
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