linux-kernel - Re: [PATCH] block,blkcg: use __GFP_NOWARN for best-effort allocations in blkcg

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Date:   Tue, 29 Nov 2016 11:38:07 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Marc MERLIN <marc@...lins.org>
Subject: Re: [PATCH] block,blkcg: use __GFP_NOWARN for best-effort
 allocations in blkcg

On Tue, Nov 29, 2016 at 08:25:07AM +0100, Michal Hocko wrote:
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -246,7 +246,7 @@ struct vm_area_struct;
>  #define GFP_ATOMIC	(__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM)
>  #define GFP_KERNEL	(__GFP_RECLAIM | __GFP_IO | __GFP_FS)
>  #define GFP_KERNEL_ACCOUNT (GFP_KERNEL | __GFP_ACCOUNT)
> -#define GFP_NOWAIT	(__GFP_KSWAPD_RECLAIM)
> +#define GFP_NOWAIT	(__GFP_KSWAPD_RECLAIM|__GFP_NOWARN)
>  #define GFP_NOIO	(__GFP_RECLAIM)
>  #define GFP_NOFS	(__GFP_RECLAIM | __GFP_IO)
>  #define GFP_TEMPORARY	(__GFP_RECLAIM | __GFP_IO | __GFP_FS | \
> 
> this will not catch users who are doing gfp & ~__GFP_DIRECT_RECLAIM but
> I would rather not make warn_alloc() even more cluttered with checks.

Yeah, FWIW, looks good to me.

-- 
tejun