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Message-ID: <20250507172336.081a41eb@gandalf.local.home>
Date: Wed, 7 May 2025 17:23:36 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: Nam Cao <namcao@...utronix.de>, Gabriele Monaco <gmonaco@...hat.com>,
linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
john.ogness@...utronix.de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 17/22] arm64: mm: Add page fault trace points
Can I get an Acked-by from the ARM64 maintainers?
Thanks,
-- Steve
On Wed, 30 Apr 2025 13:02:32 +0200
Nam Cao <namcao@...utronix.de> wrote:
> Add page fault trace points, which are useful to implement RV monitor which
> watches page faults.
>
> Signed-off-by: Nam Cao <namcao@...utronix.de>
> ---
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
> arch/arm64/mm/fault.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index ef63651099a9..e3f096b0dffd 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -44,6 +44,9 @@
> #include <asm/tlbflush.h>
> #include <asm/traps.h>
>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/exceptions.h>
> +
> struct fault_info {
> int (*fn)(unsigned long far, unsigned long esr,
> struct pt_regs *regs);
> @@ -559,6 +562,11 @@ static int __kprobes do_page_fault(unsigned long far, unsigned long esr,
> if (kprobe_page_fault(regs, esr))
> return 0;
>
> + if (user_mode(regs))
> + trace_page_fault_user(addr, regs, esr);
> + else
> + trace_page_fault_kernel(addr, regs, esr);
> +
> /*
> * If we're in an interrupt or have no user context, we must not take
> * the fault.
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