Note that read barriers are also needed if you want to implement a GC like Baker's real time copying collector that uses incremental forwarding.
Rodrigo On 5/24/06, Weldon Washburn <[EMAIL PROTECTED]> wrote:
On 5/24/06, Ivan Volosyuk <[EMAIL PROTECTED]> wrote: > I have a patch for drlvm which enables use of write barriers. This > works in interpreter mode only yet. I can put it on jira if somebody > is interested. This is helpful. Please post the patch. I will take a look at it sometime soon. Thanks >The write barriers are tested with an algorithm which > does per-slot validation and should work fine. > -- > Ivan > > 2006/5/24, Daniel Feinberg <[EMAIL PROTECTED]>: > > > >My understanding of write barriers is as an optimization. > > > That fits with my understanding of write barriers also. I do not > > > know for certain but suspect that MMTK can somehow be configured such > > > that write barriers are not required for correctness. Maybe Dan > > > Feinberg can tell the mailing list. > > > > So MMTK is a toolkit for building GCs. When doing generational > > collection the write barrier is used to keep track of pointers that go > > from older generations to yonger generations. You must have a way to > > track these objects because when you do a partial heap collection (aka > > just the nursery or nursery and old1) you need to build a root set of > > all things that point into that space. Then you trace this root set to > > find all live objects that need to be moved to an older generation. In > > other methods of collecting the write barrier is not as important. > > Here unless you can find all of these pointers that point into a space > > from an older space you must use a write barrier. > > > > > > Daniel > > --------------------------------------------------------------------- > Terms of use : http://incubator.apache.org/harmony/mailing.html > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- Weldon Washburn Intel Middleware Products Division --------------------------------------------------------------------- Terms of use : http://incubator.apache.org/harmony/mailing.html To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
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