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Date:   Wed, 25 Jan 2017 01:22:17 +0300
From:   "Kirill A. Shutemov" <>
To:     Andrew Morton <>
Cc:     "Kirill A. Shutemov" <>,
        Andrea Arcangeli <>,
        Hugh Dickins <>,
        Rik van Riel <>,,, Oleg Nesterov <>,
        Peter Zijlstra <>
Subject: Re: [PATCH 01/12] uprobes: split THPs before trying replace them

On Tue, Jan 24, 2017 at 01:28:49PM -0800, Andrew Morton wrote:
> On Tue, 24 Jan 2017 19:28:13 +0300 "Kirill A. Shutemov" <> wrote:
> > 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().

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

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

 Kirill A. Shutemov

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