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authorPeter Zijlstra <peterz@infradead.org>2016-02-23 13:28:22 +0100
committerIngo Molnar <mingo@kernel.org>2016-02-29 09:41:51 +0100
commit48be3a67da7413d62e5efbcf2c73a9dddf61fb96 (patch)
treec1ab0dc2ddaa29ab337a0ae79e857ab2e1129955 /arch/x86/include/asm/disabled-features.h
parentsched/cgroup: Fix cgroup entity load tracking tear-down (diff)
downloadlinux-48be3a67da7413d62e5efbcf2c73a9dddf61fb96.tar.xz
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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 'arch/x86/include/asm/disabled-features.h')
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