linux-kernel - Re: [patch] mm, thp: add new background defrag option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 9 Jan 2017 19:38:31 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     David Rientjes <rientjes@...gle.com>
cc:     Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm, thp: add new background defrag option

On Mon, 9 Jan 2017, David Rientjes wrote:
> On Mon, 9 Jan 2017, Vlastimil Babka wrote:
> 
> > > Any suggestions for a better name for "background" are more than welcome.  
> > 
> > Why not just "madvise+defer"?
> > 
> 
> Seeing no other activity regarding this issue (omg!), I'll wait a day or 
> so to see if there are any objections to "madvise+defer" or suggestions 
> that may be better and repost.

I get very confused by the /sys/kernel/mm/transparent_hugepage/defrag
versus enabled flags, and this may be a terrible, even more confusing,
idea: but I've been surprised and sad to see defrag with a "defer"
option, but poor enabled without one; and it has crossed my mind that
perhaps the peculiar "madvise+defer" syntax in defrag might rather be
handled by "madvise" in defrag with "defer" in enabled?  Or something
like that: 4 x 4 possibilities instead of 5 x 3.

Please be gentle with me,
Hugh