linux-kernel - Re: [PATCH v6 8/9] mm: multigenerational lru: user interface

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Message-ID: <Yd6uHYtjGfgqjDpw@dhcp22.suse.cz>
Date:   Wed, 12 Jan 2022 11:31:57 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Yu Zhao <yuzhao@...gle.com>
Cc:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>, Jens Axboe <axboe@...nel.dk>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Michael Larabel <Michael@...haellarabel.com>,
        Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Ying Huang <ying.huang@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        page-reclaim@...gle.com, x86@...nel.org,
        Konstantin Kharlamov <Hi-Angel@...dex.ru>
Subject: Re: [PATCH v6 8/9] mm: multigenerational lru: user interface

On Wed 12-01-22 01:35:52, Yu Zhao wrote:
[...]
> But I saw people not following this practice, and I'm also tempted to
> do so. Can anybody remind me whether it's considered a bad practice to
> have code changes and Kconfig changes in the same patch?

If you want to have the patch series bisectable then it is preferable to
add kconfig options early so that the code is enabled in the respective
steps. Sometimes that can be impractical though (e.g. when the feature is
incomplete at that stage).
-- 
Michal Hocko
SUSE Labs