[Bug 1336 (linux mm)] Changed - Cache flushing bug

[bugzilla-daemon@distro.conectiva.com.br]

http://distro.conectiva.com.br/bugzilla/show_bug.cgi?id=1336





------- Additional Comments From sct@redhat.com  2001-02-13 08:11 -------
This is a hot path: if you have a parent process continually forking children,
then the parent may have a swapped pte which is physically in memory and the
children will be looking that page up in the swap cache on each fork.  Slowing
that down with unnecessary cache flushes is a bad thing.

Sendmail and apache show this behaviour.

If we need to flush the cache because of IO, then surely we should be moving it
to the IO path, not adding cache flushes to the in-memory swap-cache lookup path?
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