Messages in this thread | | | Subject | Re: [PATCH] [Request for inclusion] Filesystem in Userspace | From | Nikita Danilov <> | Date | Thu, 18 Nov 2004 23:13:17 +0300 |
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Linus Torvalds <torvalds@osdl.org> writes:
[...]
> > We actually had (for a short while) code that tracked the dirty bit in > software (ie make it unwritable by default, and take the write fault), but > people showed that that was actually a real performance problem on some > loads.
Dirtiness can be tracked for a fraction of pages (for example, make pte unwritable when page crosses active/inactive list boundary, or alike). This will allow kernel to guarantee that there really is _known_ amount of clean pages in the system, without taking a lot of unnecessary faults.
[... notes on kernel development methodology skipped ...]
> > Linus
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