netdev - Re: [PATCH 2/5] mm/page_alloc: Add a bulk page allocator

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Message-ID: <20210312124331.GY3479805@casper.infradead.org>
Date:   Fri, 12 Mar 2021 12:43:31 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Net <netdev@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-NFS <linux-nfs@...r.kernel.org>
Subject: Re: [PATCH 2/5] mm/page_alloc: Add a bulk page allocator

On Wed, Mar 10, 2021 at 10:46:15AM +0000, Mel Gorman wrote:
> +int __alloc_pages_bulk_nodemask(gfp_t gfp_mask, int preferred_nid,
> +				nodemask_t *nodemask, int nr_pages,
> +				struct list_head *list);

For the next revision, can you ditch the '_nodemask' part of the name?
Andrew just took this patch from me:

    mm/page_alloc: combine __alloc_pages and __alloc_pages_nodemask
    
    There are only two callers of __alloc_pages() so prune the thicket of
    alloc_page variants by combining the two functions together.  Current
    callers of __alloc_pages() simply add an extra 'NULL' parameter and
    current callers of __alloc_pages_nodemask() call __alloc_pages() instead.

...

-__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
-                                                       nodemask_t *nodemask);
-
-static inline struct page *
-__alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid)
-{
-       return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL);
-}
+struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
+               nodemask_t *nodemask);

So calling this function __alloc_pages_bulk() fits with the new naming
scheme.

> @@ -4919,6 +4934,9 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
>  		struct alloc_context *ac, gfp_t *alloc_mask,
>  		unsigned int *alloc_flags)
>  {
> +	gfp_mask &= gfp_allowed_mask;
> +	*alloc_mask = gfp_mask;

Also I renamed alloc_mask to alloc_gfp.