From: Heiko Carstens <hca@linux.ibm.com>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: akpm@linux-foundation.org, Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
x86@kernel.org, linux-arm-kernel@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
linux-s390@vger.kernel.org, surenb@google.com,
linux-mm@kvack.org
Subject: Re: [PATCH v2 6/7] s390: mm: accelerate pagefault when badaccess
Date: Sun, 7 Apr 2024 19:19:52 +0200 [thread overview]
Message-ID: <20240407171952.5958-B-hca@linux.ibm.com> (raw)
In-Reply-To: <20240403083805.1818160-7-wangkefeng.wang@huawei.com>
On Wed, Apr 03, 2024 at 04:38:04PM +0800, Kefeng Wang wrote:
> The vm_flags of vma already checked under per-VMA lock, if it is a
> bad access, directly handle error, no need to retry with mmap_lock
> again. Since the page faut is handled under per-VMA lock, count it
> as a vma lock event with VMA_LOCK_SUCCESS.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
> arch/s390/mm/fault.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
> index c421dd44ffbe..162ca2576fd4 100644
> --- a/arch/s390/mm/fault.c
> +++ b/arch/s390/mm/fault.c
> @@ -325,7 +325,8 @@ static void do_exception(struct pt_regs *regs, int access)
> goto lock_mmap;
> if (!(vma->vm_flags & access)) {
> vma_end_read(vma);
> - goto lock_mmap;
> + count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
> + return handle_fault_error_nolock(regs, SEGV_ACCERR);
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
next prev parent reply other threads:[~2024-04-07 17:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-03 8:37 [PATCH v2 0/7] arch/mm/fault: " Kefeng Wang
2024-04-03 8:37 ` [PATCH v2 1/7] arm64: mm: cleanup __do_page_fault() Kefeng Wang
2024-04-09 11:14 ` Catalin Marinas
2024-04-03 8:38 ` [PATCH v2 2/7] arm64: mm: accelerate pagefault when VM_FAULT_BADACCESS Kefeng Wang
2024-04-09 11:15 ` Catalin Marinas
2024-04-03 8:38 ` [PATCH v2 3/7] arm: " Kefeng Wang
2024-04-03 8:38 ` [PATCH v2 4/7] powerpc: mm: accelerate pagefault when badaccess Kefeng Wang
2024-04-09 8:56 ` Michael Ellerman
2024-04-03 8:38 ` [PATCH v2 5/7] riscv: " Kefeng Wang
2024-04-10 7:32 ` Alexandre Ghiti
2024-04-10 8:07 ` Kefeng Wang
2024-04-10 17:28 ` Alexandre Ghiti
2024-04-11 1:17 ` Kefeng Wang
2024-04-03 8:38 ` [PATCH v2 6/7] s390: " Kefeng Wang
2024-04-07 17:19 ` Heiko Carstens [this message]
2024-04-03 8:38 ` [PATCH v2 7/7] x86: " Kefeng Wang
2024-04-03 20:45 ` [PATCH v2 0/7] arch/mm/fault: " Andrew Morton
2024-04-07 7:49 ` Kefeng Wang
2024-04-07 17:19 ` Heiko Carstens
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