Re: [PATCH] mm: remove global locks from mm/highmem.c

[Martin J. Bligh]

Andrew Morton wrote:
> On Mon, 29 Jan 2007 17:31:20 -0800
> "Martin J. Bligh" <mbligh@xxxxxxxxxx> wrote:
>
> > Peter Zijlstra wrote:
> > > On Sun, 2007-01-28 at 14:29 -0800, Andrew Morton wrote:
> > >
> > > > As Christoph says, it's very much preferred that code be migrated over to
> > > > kmap_atomic().  Partly because kmap() is deadlockable in situations where a
> > > > large number of threads are trying to take two kmaps at the same time and
> > > > we run out.  This happened in the past, but incidences have gone away,
> > > > probably because of kmap->kmap_atomic conversions.
> > > > From which callsite have you measured problems?
> > > CONFIG_HIGHPTE code in -rt was horrid. I'll do some measurements on
> > > mainline.
> > CONFIG_HIGHPTE is always horrid -we've known that for years.
>
> We have?  What's wrong with it?  <looks around for bug reports>

http://www.ussg.iu.edu/hypermail/linux/kernel/0307.0/0463.html

July 2003.


M.
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