Messages in this thread | | | Date | Sat, 09 Oct 2021 12:07:54 +0200 | From | Peter Zijlstra <> | Subject | [PATCH v3 0/6] Freezer rewrite |
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Hi all,
This is the by now familiar rewrite of the freezer, but with yet another attempt at getting the special blocked states (STOPPED/TRACED) right.
Currently it is already possible to tell if a task should be STOPPED from looking at p->jobctl, the same idea is extended to TRACED and p->ptrace.
But treating p->jobctl/p->ptrace as canonical state, the blocked state can be (hopefully correctly this time) reconstructed from it at all times. Specifically, if a TRACED task was woken by the tracer, while the tracee was FROZEN, the p->ptrace state will have been updated, and the thaw operation will result in the wakeup.
Oleg, if you can please try and shoot holes in it again? :-)
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