Re: [PATCH v1 09/10] mm: make rmap_one boolean function

From	Minchan Kim <minchan@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH v1 09/10] mm: make rmap_one boolean function
Date	2017-03-14 08:40 +0100
Message-ID	<tkPdL-5ce-1@gated-at.bofh.it> (permalink)
References	<tkmbL-Hg-3@gated-at.bofh.it> <tkmbL-Hg-13@gated-at.bofh.it> <tkE8G-5gy-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Andrew,

On Mon, Mar 13, 2017 at 12:45:00PM -0700, Andrew Morton wrote:
> On Mon, 13 Mar 2017 09:35:52 +0900 Minchan Kim <minchan@kernel.org> wrote:
> 
> > rmap_one's return value controls whether rmap_work should contine to
> > scan other ptes or not so it's target for changing to boolean.
> > Return true if the scan should be continued. Otherwise, return false
> > to stop the scanning.
> > 
> > This patch makes rmap_one's return value to boolean.
> 
> "SWAP_AGAIN" conveys meaning to the reader, whereas the meaning of
> "true" is unclear.  So it would be better to document the return value
> of these functions.

Fair enough.
I will add description like this.

        /*
         * Return false if page table scanning in rmap_walk should be stopped.
         * Otherwise, return true.
         */
        bool (*rmap_one)(struct page *page, struct vm_area_struct *vma,
                                        unsigned long addr, void *arg);


I will wait by noon tomorrow and if there are no further comment,
I will resend v2.

Thanks.

Thread

[PATCH v1 00/10] make try_to_unmap simple Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100
  [PATCH v1 07/10] mm: make ttu's return boolean Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100
  [PATCH v1 02/10] mm: remove SWAP_DIRTY in ttu Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100
    Re: [PATCH v1 02/10] mm: remove SWAP_DIRTY in ttu "Hillf Danton" <hillf.zj@alibaba-inc.com> - 2017-03-13 07:40 +0100
      Re: [PATCH v1 02/10] mm: remove SWAP_DIRTY in ttu Minchan Kim <minchan@kernel.org> - 2017-03-14 08:40 +0100
  [PATCH v1 01/10] mm: remove unncessary ret in page_referenced Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100
    Re: [PATCH v1 01/10] mm: remove unncessary ret in page_referenced "Hillf Danton" <hillf.zj@alibaba-inc.com> - 2017-03-13 07:30 +0100
  [PATCH v1 09/10] mm: make rmap_one boolean function Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100
    Re: [PATCH v1 09/10] mm: make rmap_one boolean function Andrew Morton <akpm@linux-foundation.org> - 2017-03-13 20:50 +0100
      Re: [PATCH v1 09/10] mm: make rmap_one boolean function Minchan Kim <minchan@kernel.org> - 2017-03-14 08:40 +0100
  [PATCH v1 08/10] mm: make rmap_walk void function Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100
  [PATCH v1 03/10] mm: remove SWAP_MLOCK check for SWAP_SUCCESS in ttu Minchan Kim <minchan@kernel.org> - 2017-03-13 01:40 +0100

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