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.
Don't use it.
If that's all we're fixing here, I'd be highly suspect ...
M.
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