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authorPeter Zijlstra <peterz@infradead.org>2015-02-09 11:53:18 +0100
committerIngo Molnar <mingo@kernel.org>2015-02-18 16:17:20 +0100
commit1fe89e1b6d270aa0d3452c60d38461ea589594e3 (patch)
treeed9a44ec4e104281dd17e0be30e7b4525d9b0b51 /arch/score/mm
parentsched/dl: Do update_rq_clock() in yield_task_dl() (diff)
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sched/autogroup: Fix failure to set cpu.rt_runtime_us
Because task_group() uses a cache of autogroup_task_group(), whose output depends on sched_class, switching classes can generate problems. In particular, when started as fair, the cache points to the autogroup, so when switching to RT the tg_rt_schedulable() test fails for every cpu.rt_{runtime,period}_us change because now the autogroup has tasks and no runtime. Furthermore, going back to the previous semantics of varying task_group() with sched_class has the down-side that the sched_debug output varies as well, even though the task really is in the autogroup. Therefore add an autogroup exception to tg_has_rt_tasks() -- such that both (all) task_group() usages in sched/core now have one. And remove all the remnants of the variable task_group() output. Reported-by: Zefan Li <lizefan@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <umgwanakikbuti@gmail.com> Cc: Stefan Bader <stefan.bader@canonical.com> Fixes: 8323f26ce342 ("sched: Fix race in task_group()") Link: http://lkml.kernel.org/r/20150209112237.GR5029@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
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