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