[LITMUS^RT] Strange performance of DPCP in P-FP

[施俊杰]

Hello:

When I allocate 3 tasks using rtspin

#!/bin/bash
sleep 2
rtspin -w -v -p 0 -M 1 -X DPCP -L 0.001 -Q 1 -q 5 0.005 1 1&
sleep 2
rtspin -w -v -p 0 -M 1 -X DPCP -L 0.00084 -Q 1 -q 6 0.0042 2 1 &
sleep 2
rtspin -w -v -p 0 -M 1 -X DPCP -L 0.002208 -Q 1 -q 7 0.01104 5 1 &
sleep 2
release_ts

where -M means the critical section will execute on processor 1.

And I traced the performance of that taskset. In some period, the
performance is strange. Some tasks are missing.
rtspin/2634:
job 644 645 794 795 994 995 are disappeared.
rtspin/2638:
job 101 102 131 132 191 192 are disappeared.
(haven't listed all the missing jobs)

Or sometimes there is a long time normal execution(shown as t3_new.pdf)

The results are shown on the attachments.

Is there anyone facing to that problems, or can anyone explain that?

Thanks a lot for that!
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