Messages in this thread | | | Date | Wed, 20 Feb 2013 22:22:58 +0800 | Subject | Re: [patch] mm: mlock: document scary-looking stack expansion mlock chain | From | Michel Lespinasse <> |
| |
On Wed, Feb 20, 2013 at 8:51 PM, Ric Mason <ric.masonn@gmail.com> wrote: > On 02/01/2013 02:10 PM, Johannes Weiner wrote: >> >> The fact that mlock calls get_user_pages, and get_user_pages might >> call mlock when expanding a stack looks like a potential recursion. > > Why expand stack need call mlock? I can't find it in the codes, could you > point out to me?
Its hidden in find_expand_vma(). Basically if the existing stack is already mlocked, any additional stack expansions get mlocked as well.
-- Michel "Walken" Lespinasse A program is never fully debugged until the last user dies.
| |