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SubjectRe: [PATCH] mm: remove global locks from mm/highmem.c
Andrew Morton wrote:
> On Mon, 29 Jan 2007 17:31:20 -0800
> "Martin J. Bligh" <mbligh@mbligh.org> 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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