linux-kernel - Re: [PATCH V4] mlx4_core: allocate ICM memory in page size chunks

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Message-ID: <20180531065405.GH15278@dhcp22.suse.cz>
Date:   Thu, 31 May 2018 08:54:05 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>, qing.huang@...cle.com,
        tariqt@...lanox.com, haakon.bugge@...cle.com,
        yanjun.zhu@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        gi-oh.kim@...fitbricks.com
Subject: Re: [PATCH V4] mlx4_core: allocate ICM memory in page size chunks

On Tue 29-05-18 23:49:59, Eric Dumazet wrote:
> 
> 
> On 05/29/2018 11:44 PM, Eric Dumazet wrote:
> 
> > 
> > And I will add this simple fix, this really should address your initial concern much better.
> > 
> > @@ -99,6 +100,8 @@ static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
> >  {
> >         struct page *page;
> >  
> > +       if (order)
> > +               gfp_mask |= __GFP_NORETRY;
> 
>     and also      gfp_mask &= ~__GFP_DIRECT_RECLAIM

JFTR the latter one makes __GFP_NORETRY pointless. Non sleeping allocations
are not retrying.

> >         page = alloc_pages_node(node, gfp_mask, order);
> >         if (!page) {
> >                 page = alloc_pages(gfp_mask, order);
> > 

-- 
Michal Hocko
SUSE Labs