linux-kernel - Re: [PATCH] mm, swap: Make VMA based swap readahead configurable

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Message-ID: <e7531802-c4bc-9a5b-1a9c-d7909f2d1107@intel.com>
Date:   Mon, 2 Oct 2017 08:45:40 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Huang, Ying" <ying.huang@...el.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Rik van Riel <riel@...hat.com>, Shaohua Li <shli@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Tim Chen <tim.c.chen@...el.com>
Subject: Re: [PATCH] mm, swap: Make VMA based swap readahead configurable

On 09/27/2017 06:02 PM, Huang, Ying wrote:
> I still think there may be a performance regression for some users
> because of the change of the algorithm and the knobs, and the
> performance regression can be resolved via setting the new knob.  But I
> don't think there will be a functionality regression.  Do you agree?

A performance regression is a regression.  I don't understand why we are
splitting hairs as to what kind of regression it is.

Are you only willing to fix it if it's a functional regression?