linux-kernel - [PATCH 0/3] mm: support huge vmalloc mapping on arm64/x86

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Date:   Sun, 26 Dec 2021 16:39:09 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <x86@...nel.org>, <linux-arm-kernel@...ts.infradead.org>
CC:     Nicholas Piggin <npiggin@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 0/3] mm: support huge vmalloc mapping on arm64/x86

huge vmalloc mappings is supported on PPC[1], but this feature should
be not only used on PPC, it could be used on arch support HAVE_ARCH_HUGE_VMAP
and PMD sized vmap mappings. this patchset is to enable this feature
on arm64/x86.

The first patch is to let user to control huge vmalloc mapping default
behavior and then enable this feature on arm64/x86.

The PPC is enabled by default(it selects HUGE_VMALLOC_DEFAULT_ENABLED),
but arm64/x86 should use hugevmalloc=on to enable this feature.

NOTE:
1) nohugevmalloc parameter is still supported, the first patch is in
   case of archs don't want to this feature enabled by default.
2) if people don't like this, we could drop the first patch.

[1] https://lore.kernel.org/linux-mm/20210317062402.533919-1-npiggin@gmail.com/

Kefeng Wang (3):
  mm: vmalloc: Let user to control huge vmalloc default behavior
  arm64: Support huge vmalloc mappings
  x86: Support huge vmalloc mappings

 .../admin-guide/kernel-parameters.txt          | 14 +++++++++++++-
 arch/arm64/Kconfig                             |  1 +
 arch/powerpc/Kconfig                           |  1 +
 arch/x86/Kconfig                               |  1 +
 mm/Kconfig                                     |  7 +++++++
 mm/vmalloc.c                                   | 18 +++++++++++++++++-
 6 files changed, 40 insertions(+), 2 deletions(-)

-- 
2.26.2