Re: Update shared mappings

["Stephen C. Tweedie" <sct@redhat.com>]

Hi,

On Wed, 2 Dec 1998 19:32:56 +0100 (CET), Andrea Arcangeli
<andrea@e-mind.com> said:

> I have a question. Please consider only the UP case (as if linux would not
> support SMP at all). Is it possible that while we are running inside
> sys_msync() and another process has the mmap semaphore held?

No, because sys_msync() takes the mm semaphore first thing.  Another
process _can_ hold the mm semaphore of a different vma on the same
region of the file, however.

> Stephen I read some emails about a PG_dirty flag. Could you tell me some
> more about that flag? 

When it gets implemented it will have whatever semantics we choose to
give it. :)  

--Stephen
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