Re: [PATCH v6] add MAP_UNLOCKED mmap flag

From: Peter Zijlstra
Date: Mon Jan 18 2010 - 09:50:39 EST

On Mon, 2010-01-18 at 14:32 +0000, Alan Cox wrote:
> > this kind of control. As of use of mlockall(MCL_FUTURE) how can I make
> > sure that all memory allocated behind my application's back (by dynamic
> > linker, libraries, stack) will be locked otherwise?
> If you add this flag you can't do that anyway - some library will
> helpfully start up using it and then you are completely stuffed or will
> be back in two or three years adding MLOCKALL_ALWAYS.

Agreed, mlockall() is a very bad interface and should not be used for a
plethora of reasons, this being one of them.

The thing is, if you cant trust your library to do sane things, then
don't use it.

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