linux-kernel - Re: [PATCH RESEND v2 4/6] mm/page_alloc: sort out the alloc_contig

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Message-ID: <Z1AaMikjy9BUNe7v@localhost.localdomain>
Date: Wed, 4 Dec 2024 10:00:34 +0100
From: Oscar Salvador <osalvador@...e.de>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...ts.ozlabs.org,
	Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>
Subject: Re: [PATCH RESEND v2 4/6] mm/page_alloc: sort out the
 alloc_contig_range() gfp flags mess

On Tue, Dec 03, 2024 at 10:47:30AM +0100, David Hildenbrand wrote:
> It's all a bit complicated for alloc_contig_range(). For example, we don't
> support many flags, so let's start bailing out on unsupported
> ones -- ignoring the placement hints, as we are already given the range
> to allocate.
> 
> While we currently set cc.gfp_mask, in __alloc_contig_migrate_range() we
> simply create yet another GFP mask whereby we ignore the reclaim flags
> specify by the caller. That looks very inconsistent.
> 
> Let's clean it up, constructing the gfp flags used for
> compaction/migration exactly once. Update the documentation of the
> gfp_mask parameter for alloc_contig_range() and alloc_contig_pages().
> 
> Acked-by: Zi Yan <ziy@...dia.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>


-- 
Oscar Salvador
SUSE Labs