linux-kernel - Re: [PATCH V6 1/4] mm/cma: Add PF flag to force non cma alloc

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Date:   Tue, 8 Jan 2019 21:38:12 -0500
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc:     akpm@...ux-foundation.org, Michal Hocko <mhocko@...nel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>, mpe@...erman.id.au,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V6 1/4] mm/cma: Add PF flag to force non cma alloc

On Tue, Jan 08, 2019 at 10:21:07AM +0530, Aneesh Kumar K.V wrote:
> This patch add PF_MEMALLOC_NOCMA which make sure any allocation in that context
> is marked non movable and hence cannot be satisfied by CMA region.
> 
> This is useful with get_user_pages_cma_migrate where we take a page pin by
> migrating pages from CMA region. Marking the section PF_MEMALLOC_NOCMA ensures
> that we avoid uncessary page migration later.
> 
> Suggested-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

Reviewed-by: Andrea Arcangeli <aarcange@...hat.com>