Re: [PATCH] General purpose zeroed page slab

Andi Kleen
2004-10-18T21:06:59Z

> It's probably worth doing this with a static cachep in slab.c and only
> exposing a get_zeroed_page() / free_zeroed_page() interface, with the
> latter doing the memset to 0.

Putting a memset in there would be dumb because the mm cleanup already
zeroes the page tables.

My dirty bitmap proposal would make that faster however, same as
copy_page_range et.al.

> I disagree with Andi over the dumbness
> of zeroing the whole page. That makes it cache-hot, which is what you
> want from a page you allocate from slab.

It's already cache hot from the page table free and you only want one cache
line in it cache hot, not the whole page.

-Andi