On Fri, 23 Mar 2001, Richard Jerrell wrote:
> > Your idea is nice, but the patch lacks a few things:
> >
> > - SMP locking, what if some other process faults in this page
> > between the atomic_read of the page count and the test later?
>
> It can't happen. free_pte is called with the page_table_lock held in
> addition to having the mmap_sem downed.
The page_table_lock and the mmap_sem only protect the *current*
task. Think about something like an apache with 500 children who
COW share the same page...
> > - testing if our process is the _only_ user of this swap page,
> > for eg. apache you'll have lots of COW-shared pages .. it would
> > be good to keep the page in memory for our siblings
>
> This is already done in free_page_and_swap_cache.
Ok ...
regards,
Rik
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