linux-kernel - Re: [PATCH v4 00/10] hugetlbfs: add fallocate support

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Date:	Wed, 22 Jul 2015 17:05:20 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Davidlohr Bueso <dave@...olabs.net>
cc:	Mike Kravetz <mike.kravetz@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric B Munson <emunson@...mai.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hugh Dickins <hughd@...gle.com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Christoph Hellwig <hch@...radead.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v4 00/10] hugetlbfs: add fallocate support

On Wed, 22 Jul 2015, Davidlohr Bueso wrote:

> fwiw, I've been trying to push people towards this for a while. Ie:
> 
> commit 15610c86fa83ff778eb80d3cfaa71d6acceb628a
> Author: Davidlohr Bueso <davidlohr@...com>
> Date:   Wed Sep 11 14:21:48 2013 -0700
> 
>     hugepage: mention libhugetlbfs in doc
>     
>     Explicitly mention/recommend using the libhugetlbfs test cases when
>     changing related kernel code.  Developers that are unaware of the project
>     can easily miss this and introduce potential regressions that may or may
>     not be caught by community review.
>     
>     Also do some cleanups that make the document visually easier to view at a
>     first glance.
>     
>     Signed-off-by: Davidlohr Bueso <davidlohr@...com>
>     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
>     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> 
> But generally speaking, I doubt this doc is read much.
> 

The mmap(2) man page cites it specifically as the source of information on 
MAP_HUGETLB and it, in turn, directs people to 
tools/testing/selftests/vm/map_hugetlb.c.  It also mentions libhugetlbfs 
as a result of your patch, so perhaps change the man page to point people 
directly there?
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