Re: [PATCH] [Request for inclusion] Filesystem in Userspace

[Nikita Danilov]

Linus Torvalds <torvalds@xxxxxxxx> 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

Nikita.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/