On Fri, 31 May 2002, Andrea Arcangeli wrote:
>
> In short the same way MAP_ANON must pageout correctly, also MAP_SHARED
> must swapout correctly with very vm intensive conditions.
That is true, but it is ignoring the fact that there _are_ real technical
differences between swap cache mappings and regular shared mappings.
One major difference is the approach to the last user: a last use of a
shared mapping still needs to write out dirty state, while the last use of
a swap page is better off noticing that it should just optimize away the
write, and we can just turn the page back into a dirty anonymous page.
But the differences are much smaller than many of the similarities.
Linus
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This archive was generated by hypermail 2b29 : Fri May 31 2002 - 22:00:32 EST