From: Michal Hocko <mhocko@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
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Subject: Re: [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use
Date: Tue, 15 Oct 2019 12:45:21 +0200 [thread overview]
Message-ID: <20191015104521.GY317@dhcp22.suse.cz> (raw)
In-Reply-To: <1571131302-32290-2-git-send-email-anshuman.khandual@arm.com>
On Tue 15-10-19 14:51:41, Anshuman Khandual wrote:
[...]
> +/**
> + * alloc_gigantic_page_order() -- tries to allocate given order of pages
> + * @order: allocation order (greater than MAX_ORDER)
> + * @gfp_mask: GFP mask to use during compaction
> + * @nid: allocation node
> + * @nodemask: allocation nodemask
> + *
> + * This routine is an wrapper around alloc_contig_range() which scans over
> + * all zones on an applicable zonelist to find a contiguous pfn range which
> + * can the be allocated with alloc_contig_range(). This routine is intended
> + * to be used for allocations greater than MAX_ORDER.
> + *
> + * Return: page on success or NULL on failure. On success a memory block
> + * of 'order' starting with 'page' has been allocated successfully. Memory
> + * allocated here needs to be freed with free_contig_range().
> + */
> +struct page *alloc_gigantic_page_order(unsigned int order, gfp_t gfp_mask,
> + int nid, nodemask_t *nodemask)
One of the objections when Mike has proposed a similar thing last year
was that the interface shouldn't be order bases
http://lkml.kernel.org/r/20180423000943.GO17484@dhcp22.suse.cz
Order based API makes sense for the buddy allocator but why should we
restrict sizes like that for an allocator that is capable to allocate
arbitrary page sized requests?
--
Michal Hocko
SUSE Labs
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next parent reply other threads:[~2019-10-15 10:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1571131302-32290-1-git-send-email-anshuman.khandual@arm.com>
[not found] ` <1571131302-32290-2-git-send-email-anshuman.khandual@arm.com>
2019-10-15 10:45 ` Michal Hocko [this message]
2019-10-15 11:07 ` [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use Anshuman Khandual
2019-10-15 11:42 ` David Hildenbrand
2019-10-15 11:47 ` Michal Hocko
2019-10-15 11:50 ` David Hildenbrand
2019-10-15 12:01 ` David Hildenbrand
2019-10-15 12:09 ` Michal Hocko
2019-10-15 12:11 ` Michal Hocko
[not found] ` <1571131302-32290-3-git-send-email-anshuman.khandual@arm.com>
2019-10-15 11:46 ` [PATCH V6 2/2] mm/debug: Add tests validating architecture page table helpers Michal Hocko
2019-10-15 12:27 ` Anshuman Khandual
2019-10-15 18:09 ` Qian Cai
2019-10-16 9:54 ` Anshuman Khandual
2019-10-15 14:41 ` [PATCH V6 0/2] " Qian Cai
2019-10-15 15:21 ` Anshuman Khandual
2019-10-15 18:42 ` Qian Cai
2019-10-16 8:59 ` Anshuman Khandual
2019-10-16 8:20 ` Michal Hocko
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