linux-kernel - Re: [PATCH v2 2/6] mm, mempolicy: stop adjusting current->il_next in mpol_rebind

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Date:   Wed, 17 May 2017 10:07:33 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Vlastimil Babka <vbabka@...e.cz>
cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        David Rientjes <rientjes@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v2 2/6] mm, mempolicy: stop adjusting current->il_next
 in mpol_rebind_nodemask()

On Wed, 17 May 2017, Vlastimil Babka wrote:

> The task->il_next variable stores the next allocation node id for task's
> MPOL_INTERLEAVE policy. mpol_rebind_nodemask() updates interleave and
> bind mempolicies due to changing cpuset mems. Currently it also tries to
> make sure that current->il_next is valid within the updated nodemask. This is
> bogus, because 1) we are updating potentially any task's mempolicy, not just
> current, and 2) we might be updating a per-vma mempolicy, not task one.

Reviewed-by: Christoph Lameter <cl@...ux.com>