Messages in this thread | | | Date | Fri, 19 Nov 2004 18:03:06 -0800 | From | William Lee Irwin III <> | Subject | Re: page fault scalability patch V11 [0/7]: overview |
| |
On Fri, Nov 19, 2004 at 11:59:03AM -0800, Linus Torvalds wrote: > You could also make "rss" be a _signed_ integer per-thread. > When unmapping a page, you decrement one of the threads that shares the mm > (doesn't matter which - which is why the per-thread rss may go negative), > and when mapping a page you increment it. > Then, anybody who actually wants a global rss can just iterate over > threads and add it all up. If you do it under the mmap_sem, it's stable, > and if you do it outside the mmap_sem it's imprecise but stable in the > long term (ie errors never _accumulate_, like the non-atomic case will > do). > Does anybody care enough? Maybe, maybe not. It certainly sounds a hell of > a lot better than the periodic scan.
Unprivileged triggers for full-tasklist scans are NMI oops material.
-- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |