Linus Torvalds writes: (Summary) Odd, I have this distinct memory of somebody even _testing_ the
global bit performance when I pointed out that we shouldn't just make
the bit go away entirely.
the bit go away entirely.
[ goes back and looks at archives ]
[ goes back and looks at archives ]
Oh, that was in fact you who did that performance test. Anyway, back then you claimed a noticeable improvement on that will-it-scale test (although a bigger one when pcid wasn't available), so yes, if we lost the "global pages for the shared user/kernel mapping" bit we should definitely get this fixed.
the bit go away entirely.
[ goes back and looks at archives ]
[ goes back and looks at archives ]
Oh, that was in fact you who did that performance test. Anyway, back then you claimed a noticeable improvement on that will-it-scale test (although a bigger one when pcid wasn't available), so yes, if we lost the "global pages for the shared user/kernel mapping" bit we should definitely get this fixed.