linux-kernel - Re: mmotm 2018-01-04-16-19 uploaded

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Message-ID: <20180105084631.GG2801@dhcp22.suse.cz>
Date:   Fri, 5 Jan 2018 09:46:31 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-next@...r.kernel.org,
        sfr@...b.auug.org.au, broonie@...nel.org
Subject: Re: mmotm 2018-01-04-16-19 uploaded

On Fri 05-01-18 12:13:17, Anshuman Khandual wrote:
> On 01/05/2018 05:50 AM, akpm@...ux-foundation.org wrote:
> > The mm-of-the-moment snapshot 2018-01-04-16-19 has been uploaded to
> > 
> >    http://www.ozlabs.org/~akpm/mmotm/
> > 
> > mmotm-readme.txt says
> > 
> > README for mm-of-the-moment:
> > 
> > http://www.ozlabs.org/~akpm/mmotm/
> > 
> > This is a snapshot of my -mm patch queue.  Uploaded at random hopefully
> > more than once a week.
> > 
> > You will need quilt to apply these patches to the latest Linus release (4.x
> > or 4.x-rcY).  The series file is in broken-out.tar.gz and is duplicated in
> > http://ozlabs.org/~akpm/mmotm/series
> > 
> > The file broken-out.tar.gz contains two datestamp files: .DATE and
> > .DATE-yyyy-mm-dd-hh-mm-ss.  Both contain the string yyyy-mm-dd-hh-mm-ss,
> > followed by the base kernel version against which this patch series is to
> > be applied.
> > 
> > This tree is partially included in linux-next.  To see which patches are
> > included in linux-next, consult the `series' file.  Only the patches
> > within the #NEXT_PATCHES_START/#NEXT_PATCHES_END markers are included in
> > linux-next.
> > 
> > A git tree which contains the memory management portion of this tree is
> > maintained at git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git
> 
> Seems like this latest snapshot mmotm-2018-01-04-16-19 has not been
> updated in this git tree. I could not fetch not it shows up in the
> http link below.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git

I will update the tree today (WIP). This is not a fully automated
process and Andrew pushed his tree during my night ;) So be patient
please. My tree is non-rebasing which means I cannot just throw the old
tree away and regenerate it from scratch.

> The last one mmotm-2017-12-22-17-55 seems to have some regression on
> powerpc with respect to ELF loading of binaries (see below). Seems to
> be related to recent MAP_FIXED_SAFE (or MAP_FIXED_NOREPLACE as seen
> now in the code). IIUC (have not been following the series last month)
> MAP_FIXED_NOREPLACE will fail an allocation request if the hint address
> cannot be reserve instead of changing existing mappings.

Correct

> Is it possible
> that ELF loading needs to be fixed at a higher level to deal with these
> new possible mmap() failures because of MAP_FIXED_NOREPLACE ?

Could you give us more information about the failure please. Debugging
patch from http://lkml.kernel.org/r/20171218091302.GL16951@dhcp22.suse.cz
should help to see what is the clashing VMA.

Thanks
-- 
Michal Hocko
SUSE Labs