Re: preemtive or non-prempteve ?

[Thomas Petazzoni <thomas.petazzoni@xxxxxxxx>]

Hi,

Bhanu Kalyan Chetlapalli wrote:

> Its not pre-emptive. But I think some ppl (esp those who use linux for
> real-time tasks) put patches to make it preemptive.

Actually, Linux 2.6 is preemptive, and this is one of the major 
improvment over 2.4. See http://lwn.net/Articles/22912/ for more 
information.

However, the kernel is not fully preemptive: there are some portions of 
code during which preemption is disabled (using preempt_disable() and 
preempt_enable()), and real-time people are trying to get rid of these 
portions of code (or at least reduce them), in order to get the lowest 
possible latencies.

I hope I didn't say any mistake.

Thomas
--
Thomas Petazzoni
thomas.petazzoni@xxxxxxxx

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