Re: [PATCH] mm->rss is modified without page_table_lock held

[Rasmus Andersen <rasmus@jaquet.dk>]

On Sat, Dec 09, 2000 at 11:25:09AM +0100, Roberto Fichera wrote:
[...]
> >+       spin_lock(&mm->page_table_lock);
> >         mm->rss++;
> >+       spin_unlock(&mm->page_table_lock);
> >
> 
> [...snip...]
> 
> Why we couldn't use atomic_inc(&mm->rss) here and below, avoiding to wrap
> the inc with a spin_lock()/spin_unlock() ?
> 

AFAIR, because for some architectures we can't rely on mm->rss fitting in
an atomic_t. See davem's (somewhat short) post in this thread. Otherwise
search the archives for the original thread treating this problem.
-- 
        Rasmus(rasmus@jaquet.dk)

Television is called a medium because it is neither rare nor well-done. 
  -- Anonymous
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