linux-kernel - [PATCH 0/2] Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP & fixup race condition on PG_dcache

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Date:   Sun, 23 Oct 2022 09:32:03 -0400
From:   guoren@...nel.org
To:     guoren@...nel.org, palmer@...belt.com, palmer@...osinc.com,
        heiko@...ech.de, arnd@...db.de, songmuchun@...edance.com,
        catalin.marinas@....com, chenhuacai@...ngson.cn,
        Conor.Dooley@...rochip.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-mm@...ck.org,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH 0/2] Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP & fixup race condition on PG_dcache_clean

From: Guo Ren <guoren@...ux.alibaba.com>

The first patch fixup race condition on PG_dcache_clean which found in
arm64. Then enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP and tested
with simple hugetlbfs test case.

# cat /proc/sys/vm/hugetlb_optimize_vmemmap
1
# echo 8 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
# mount -t hugetlbfs none test/ -o pagesize=2048k
# ./myhugemap_test
# umount test/
# echo 0 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

No problem found.

Guo Ren (2):
  riscv: Fixup race condition on PG_dcache_clean in flush_icache_pte
  riscv: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP

 arch/riscv/Kconfig                  | 1 +
 arch/riscv/include/asm/cacheflush.h | 3 +++
 arch/riscv/mm/cacheflush.c          | 7 ++++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

-- 
2.36.1