From: "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
To: Brendan Jackman <jackmanb@google.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Wei Xu <weixugc@google.com>, Johannes Weiner <hannes@cmpxchg.org>,
Zi Yan <ziy@nvidia.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org,
rppt@kernel.org, Sumit Garg <sumit.garg@oss.qualcomm.com>,
derkling@google.com, reijiw@google.com,
Will Deacon <will@kernel.org>,
rientjes@google.com, "Kalyazin, Nikita" <kalyazin@amazon.co.uk>,
patrick.roy@linux.dev, "Itazuri, Takahiro" <itazur@amazon.co.uk>,
Andy Lutomirski <luto@kernel.org>,
David Kaplan <david.kaplan@amd.com>,
Thomas Gleixner <tglx@kernel.org>,
Yosry Ahmed <yosry.ahmed@linux.dev>
Subject: Re: [PATCH RFC 00/19] mm: Add __GFP_UNMAPPED
Date: Mon, 2 Mar 2026 16:36:44 +0100 [thread overview]
Message-ID: <6206d021-e6c2-4899-b426-cacd71ebd5ef@kernel.org> (raw)
In-Reply-To: <20260225-page_alloc-unmapped-v1-0-e8808a03cd66@google.com>
On 2/25/26 17:34, Brendan Jackman wrote:
> .:: What? Why?
> .:: Why [RFC]?
>
> I really wanted to stop sending RFC and start sending PATCHes but
> getting this series out has taken months longer than I expected, so it's
> time to get something on the list. The known issues here are:
>
> 1. __GFP_UNMAPPED isn't useful yet until guest_memfd unmapping support
> [0] gets merged.
>
> 2. Apparently while implementing the mm-local region, I totally forgot
> that KPTI existed on 32-bit systems. I expect the 0-day bot to fire a
> failure on that patch.
I don't think you mentioned (at least in the cover letter) the mm resistance
to add new gfp flags due to number of them being uncomfortably close to 32
already. But I see you've put the new one behind a config. Together with
point 2 I wonder if this is where we can start making some flags and
associated functionality 64-bit only and change gfp_t to unsigned long?
next prev parent reply other threads:[~2026-03-02 15:36 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-25 16:34 [PATCH RFC 00/19] mm: Add __GFP_UNMAPPED Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 01/19] x86/mm: split out preallocate_sub_pgd() Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 02/19] x86/mm: Generalize LDT remap into "mm-local region" Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 03/19] x86/tlb: Expose some flush function declarations to modules Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 04/19] x86/mm: introduce the mermap Brendan Jackman
2026-02-27 10:47 ` Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 05/19] mm: KUnit tests for " Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 06/19] mm: introduce for_each_free_list() Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 07/19] mm/page_alloc: don't overload migratetype in find_suitable_fallback() Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 08/19] mm: introduce freetype_t Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 09/19] mm: move migratetype definitions to freetype.h Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 10/19] mm: add definitions for allocating unmapped pages Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 11/19] mm: rejig pageblock mask definitions Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 12/19] mm: encode freetype flags in pageblock flags Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 13/19] mm/page_alloc: remove ifdefs from pindex helpers Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 14/19] mm/page_alloc: separate pcplists by freetype flags Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 15/19] mm/page_alloc: rename ALLOC_NON_BLOCK back to _HARDER Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 16/19] mm/page_alloc: introduce ALLOC_NOBLOCK Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 17/19] mm/page_alloc: implement __GFP_UNMAPPED allocations Brendan Jackman
2026-02-27 10:56 ` Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 18/19] mm/page_alloc: implement __GFP_UNMAPPED|__GFP_ZERO allocations Brendan Jackman
2026-02-27 11:04 ` Brendan Jackman
2026-02-25 16:34 ` [PATCH RFC 19/19] mm: Minimal KUnit tests for some new page_alloc logic Brendan Jackman
2026-03-02 15:36 ` Vlastimil Babka (SUSE) [this message]
2026-03-05 11:16 ` [PATCH RFC 00/19] mm: Add __GFP_UNMAPPED Brendan Jackman
2026-03-06 14:41 ` Borislav Petkov
2026-03-05 14:51 ` Kevin Brodsky
2026-03-05 15:58 ` Brendan Jackman
2026-03-06 12:31 ` Kevin Brodsky
2026-03-06 18:17 ` Mike Rapoport
2026-03-06 17:38 ` Edgecombe, Rick P
2026-03-16 16:01 ` Brendan Jackman
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