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author | Peter Zijlstra <peterz@infradead.org> | 2016-02-23 13:28:22 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2016-02-29 09:41:51 +0100 |
commit | 48be3a67da7413d62e5efbcf2c73a9dddf61fb96 (patch) | |
tree | c1ab0dc2ddaa29ab337a0ae79e857ab2e1129955 /virt | |
parent | 6fe1f348b3dd1f700f9630562b7d38afd6949568 (diff) | |
download | linux-48be3a67da7413d62e5efbcf2c73a9dddf61fb96.tar.bz2 |
sched/deadline: Always calculate end of period on sched_yield()
Steven noticed that occasionally a sched_yield() call would not result
in a wait for the next period edge as expected.
It turns out that when we call update_curr_dl() and end up with
delta_exec <= 0, we will bail early and fail to throttle.
Further inspection of the yield code revealed that yield_task_dl()
clearing dl.runtime is wrong too, it will not account the last bit of
runtime which could result in dl.runtime < 0, which in turn means that
replenish would gift us with too much runtime.
Fix both issues by not relying on the dl.runtime value for yield.
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Juri Lelli <juri.lelli@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160223122822.GP6357@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions