linux-kernel - Re: [RFC 2/3] mm: Add a new page flag PageLayzyFree() for MADV

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Message-Id: <0C8CC772-5840-4F0C-9859-C1D7B8BF6025@redhat.com>
Date:   Fri, 28 Feb 2020 07:13:33 +0100
From:   David Hildenbrand <david@...hat.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Zi Yan <ziy@...dia.com>, Michal Hocko <mhocko@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Minchan Kim <minchan@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [RFC 2/3] mm: Add a new page flag PageLayzyFree() for MADV_FREE



> Am 28.02.2020 um 04:38 schrieb Huang, Ying <ying.huang@...el.com>:
> 
> From: Huang Ying <ying.huang@...el.com>
> 
> Now !PageSwapBacked() is used as the flag for the pages freed lazily
> via MADV_FREE.  This isn't obvious enough.  So Dave suggested to add a
> new page flag for that to improve the code readability.

This patch subject and description is *really* confusing. You‘re adding a helper function, not a page flag. It‘s a fairly easy refactoring.

(Adding new page flags is close to impossible).

Cheers!