linux-kernel - Re: [PATCH v5 02/11] mm: mempolicy: add queue_pages_node

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Date:   Fri, 19 May 2017 22:39:12 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Zi Yan <zi.yan@...rutgers.edu>
Cc:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        n-horiguchi@...jp.nec.com, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, minchan@...nel.org, vbabka@...e.cz,
        mhocko@...nel.org, dnellans@...dia.com
Subject: Re: [PATCH v5 02/11] mm: mempolicy: add queue_pages_node_check()

On Fri, May 19, 2017 at 04:48:54PM -0400, Zi Yan wrote:
> On 19 May 2017, at 16:28, Mel Gorman wrote:
> 
> > On Fri, May 19, 2017 at 12:37:38PM -0400, Zi Yan wrote:
> >>> As you say, there is no functional change but the helper name is vague
> >>> and gives no hint to what's it's checking for. It's somewhat tolerable as
> >>> it is as it's obvious what is being checked but the same is not true with
> >>> the helper name.
> >>>
> >>
> >> Does queue_pages_invert_nodemask_check() work? I can change the helper name
> >> in the next version.
> >>
> >
> > Not particularly, maybe queue_pages_required and invert the check with a
> > comment above it explaining what it's checking for would be ok.
> >
> 
> queue_pages_required() is too broad,

I'm somewhat amused that you'd complain that "required" is too broad while
thinking "check" is somehow self-explanatory.

> I would take queue_pages_page_nid_check()
> and invert the check with a comment above saying
> 
> /*
>  * Check if the page's nid is in qp->nmask.
>  *
>  * If MPOL_MF_INVERT is set in qp->flags, check if the nid is
>  * in the invert of qp->nmask.
>  */
> 
> Does it work?
> 

I still don't like the name but I also am not interested in debating it
further for something so small. Add the comment, it's better than nothing.

-- 
Mel Gorman
SUSE Labs