linux-kernel - Re: [PATCH] mm/mempolicy.c: forbid static or relative flags for local NUMA mode

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Message-ID: <alpine.DEB.2.10.1609191755060.53329@chino.kir.corp.google.com>
Date:   Mon, 19 Sep 2016 17:57:17 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Piotr Kwapulinski <kwapulinski.piotr@...il.com>
cc:     akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
        vbabka@...e.cz, mhocko@...nel.org, mgorman@...hsingularity.net,
        liangchen.linux@...il.com, nzimmer@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/mempolicy.c: forbid static or relative flags for
 local NUMA mode

On Sun, 18 Sep 2016, Piotr Kwapulinski wrote:

> The MPOL_F_STATIC_NODES and MPOL_F_RELATIVE_NODES flags are irrelevant
> when setting them for MPOL_LOCAL NUMA memory policy via set_mempolicy.
> Return the "invalid argument" from set_mempolicy whenever
> any of these flags is passed along with MPOL_LOCAL.
> It is consistent with MPOL_PREFERRED passed with empty nodemask.
> It also slightly shortens the execution time in paths where these flags
> are used e.g. when trying to rebind the NUMA nodes for changes in
> cgroups cpuset mems (mpol_rebind_preferred()) or when just printing
> the mempolicy structure (/proc/PID/numa_maps).
> Isolated tests done.
> 
> Signed-off-by: Piotr Kwapulinski <kwapulinski.piotr@...il.com>

Acked-by: David Rientjes <rientjes@...gle.com>

There wasn't an MPOL_LOCAL when I introduced either of these flags, it's 
an oversight to allow them to be passed.

Want to try to update set_mempolicy(2) with the procedure outlined in 
https://www.kernel.org/doc/man-pages/patches.html as well?