linux-kernel - Re: [PATCH v3 0/1] mm/mempolicy.c: forbid static or relative flags for local NUMA mode

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Message-ID: <alpine.DEB.2.10.1610311721050.91888@chino.kir.corp.google.com>
Date:   Mon, 31 Oct 2016 17:21:22 -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@...e.com, liangchen.linux@...il.com,
        mgorman@...hsingularity.net, dave.hansen@...ux.intel.com,
        nzimmer@....com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH v3 0/1] mm/mempolicy.c: forbid static or relative flags
 for local NUMA mode

On Thu, 27 Oct 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
> or mbind.
> Return the "invalid argument" from set_mempolicy and mbind whenever
> any of these flags is passed along with MPOL_LOCAL.
> It is consistent with MPOL_PREFERRED passed with empty nodemask.
> It 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>