On Wed, 27 Jun 2007, Hugh Dickins wrote:
> In honesty, I should add that I dislike and distrust Davide's
> MAP_NOZERO very much indeed! Would much rather leave my cpus
> spending a little time in clear_page(). A uid in struct page
> (though I'm sure we could find somewhere to tuck it away) -
> the horror, the horror! But I've so far failed to find a killer
> argument against it, and am hoping for someone else to do so.
Little time? Please, do not trust me. Start oprofile and run a kernel
build. Look, I'm not even talking about som micro benchmark explicitly
built to exploit the thing. A kernel build.
You will find clear_page to be the *1st* kernel entry after cc1 and as.
That is bad for two reasons. The time it spends in there, and the cache it
blows.
- Davide
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