Messages in this thread | | | Date | Fri, 26 Aug 2005 09:43:20 -0700 | From | Ross Biro <> | Subject | Re: process creation time increases linearly with shmem |
| |
On 8/26/05, Hugh Dickins <hugh@veritas.com> wrote: > On Fri, 26 Aug 2005, Ross Biro wrote: > > On 8/26/05, Hugh Dickins <hugh@veritas.com> wrote: > > > > > > The refaulting will hurt the performance of something: let's > > > just hope that something doesn't turn out to be a show-stopper. > > > > Why not just fault in all the pages on the first fault. Then the performance > > loss is a single page fault (the page table copy that would have happened a > > fork time now happens at fault time) and you get the big win for processes > > that do fork/exec. > > "all" might be very many more pages than were ever mapped in the parent, > and not be a win. Some faultahead might work better. Might, might, ...
If you reduce "all" to whatever would have been done in fork originially, then you've got a big win in some cases and a minimal loss in others, and it's easy to argue you've got something better.
Now changng "all" to something even less might be an even bigger win, but that requires a lot of benchmarking to justify.
Ross - 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/
| |