linux-kernel - Re: [PATCH] arm64: ptdump: Allow dumping user page tables

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Message-ID: <20211019120931.GJ13251@willie-the-truck>
Date:   Tue, 19 Oct 2021 13:09:32 +0100
From:   Will Deacon <will@...nel.org>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     Catalin Marinas <catalin.marinas@....com>, kernel@...s.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: ptdump: Allow dumping user page tables

On Fri, Oct 01, 2021 at 04:56:03PM +0200, Vincent Whitchurch wrote:
> Add a user_page_tables debugfs file (similar to kernel_page_tables) to
> dump out the userspace page tables for the current process.  This
> provides details which are not available via pagemap (such as the memory
> type) and is useful when, for example, debugging ->mmap()
> implementations.
> 
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
> ---
>  arch/arm64/mm/ptdump.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)

How does this serialise with things like task exit?

Will