linux-kernel - Re: [PATCH 1/4] mm: Trial do_wp

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Message-ID: <20200915161814.GC2949@xz-x1>
Date:   Tue, 15 Sep 2020 12:18:14 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Maya B . Gokhale" <gokhale2@...l.gov>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Marty Mcfadden <mcfadden8@...l.gov>,
        Kirill Shutemov <kirill@...temov.name>,
        Jann Horn <jannh@...gle.com>, Jan Kara <jack@...e.cz>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/4] mm: Trial do_wp_page() simplification

On Tue, Sep 15, 2020 at 05:03:49PM +0200, Oleg Nesterov wrote:
> > -		if (reuse_swap_page(vmf->page, &total_map_swapcount)) {
> 
> It seems that nobody else calls reuse_swap_page() with total_map_swapcount != NULL.

Seems correct.  Though maybe we could postpone the cleanup later, until the
fallouts of the cow rework settle (just in case we'd like to bring some
mapcount logic back).  Thanks,

-- 
Peter Xu