Messages in this thread | | | Date | Tue, 19 Oct 2021 14:33:08 +0200 | From | Vincent Whitchurch <> | Subject | Re: [PATCH] arm64: ptdump: Allow dumping user page tables |
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On Tue, Oct 19, 2021 at 02:09:32PM +0200, Will Deacon wrote: > 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@axis.com> > > --- > > arch/arm64/mm/ptdump.c | 15 ++++++++++++++- > > 1 file changed, 14 insertions(+), 1 deletion(-) > > How does this serialise with things like task exit?
A task can only read its own page tables using this file, and the mm lock is held during the walk in ptdump_walk_pgd(). Isn't that sufficient?
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