On Tue, Jan 24, 2017 at 02:35:59PM -0800, Andrew Morton wrote:

On Wed, 25 Jan 2017 01:22:17 +0300 "Kirill A. Shutemov" [off-list ref] wrote:

quoted

On Tue, Jan 24, 2017 at 01:28:49PM -0800, Andrew Morton wrote:

quoted

On Tue, 24 Jan 2017 19:28:13 +0300 "Kirill A. Shutemov" [off-list ref] wrote:

quoted

For THPs page_check_address() always fails. It's better to split them
first before trying to replace.

So what does this mean.  uprobes simply fails to work when trying to
place a probe into a THP memory region?

Looks like we can end up with endless retry loop in uprobe_write_opcode().

quoted

How come nobody noticed (and reported) this when using the feature?

I guess it's not often used for anon memory.

OK,  can we please include discussion of these things in the changelog?

Okay, I'll try to come up with a test case too.

-- 
 Kirill A. Shutemov

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