Messages in this thread | | | Date | Sat, 21 Sep 2002 06:48:40 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [ANNOUNCE] Native POSIX Thread Library 0.1 |
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On Fri, 20 Sep 2002, Bill Huey wrote:
> The JVM with incremental GC is being targetted for media oriented tasks > using the new NIO, 3d library, etc... slowness in safepoints would > cripple it for these tasks. It's a critical item and not easily address > by the current 1:1 model.
actually, in the previous mail i've outlined a sensible way to help safepoints in the kernel, for the case of the 1:1 model. I'd not call that 'not easily addressed' :-)
there's an even more advanced way to expose preempted user contexts in the 1:1 model: by putting most of the the register info (which is now dumped into the kernel stack) into a page that is also mapped into user-space. This too introduces (constant) syscall entry/exit overhead, but can be done if justified.
Ingo
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