linux-kernel - Re: [PATCH 1/2] mm,compaction,cma: add alloc_contig flag to compact

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Date:   Mon, 24 Feb 2020 16:04:27 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org,
        riel@...com
Cc:     kernel-team@...com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        mhocko@...nel.org, mgorman@...hsingularity.net,
        rientjes@...gle.com, aarcange@...hat.com
Subject: Re: [PATCH 1/2] mm,compaction,cma: add alloc_contig flag to
 compact_control

On 2/21/20 10:53 PM, Rik van Riel wrote:
> Add information to struct compact_control to indicate that the allocator
> would really like to clear out this specific part of memory, used by for
> example CMA.
> 
> Signed-off-by: Rik van Riel <riel@...riel.com>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

Could have been just squashed into patch 2, but no strong feelings.

> ---
>  mm/internal.h   | 1 +
>  mm/page_alloc.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/mm/internal.h b/mm/internal.h
> index 3cf20ab3ca01..78492d9815b4 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -206,6 +206,7 @@ struct compact_control {
>  	bool whole_zone;		/* Whole zone should/has been scanned */
>  	bool contended;			/* Signal lock or sched contention */
>  	bool rescan;			/* Rescanning the same pageblock */
> +	bool alloc_contig;		/* alloc_contig_range allocation */
>  };
>  
>  /*
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 3c4eb750a199..a36736812596 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -8402,6 +8402,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
>  		.ignore_skip_hint = true,
>  		.no_set_skip_hint = true,
>  		.gfp_mask = current_gfp_context(gfp_mask),
> +		.alloc_contig = true,
>  	};
>  	INIT_LIST_HEAD(&cc.migratepages);
>  
>