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sched/deadline: Implement GRUB accounting

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According to the GRUB (Greedy Reclaimation of Unused Bandwidth)
reclaiming algorithm, the runtime is not decreased as "dq = -dt",
but as "dq = -Uact dt" (where Uact is the per-runqueue active
utilization).
Hence, this commit modifies the runtime accounting rule in
update_curr_dl() to implement the GRUB rule.

Tested-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Luca Abeni <luca.abeni@santannapisa.it>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Claudio Scordino <claudio@evidence.eu.com>
Cc: Joel Fernandes <joelaf@google.com>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
Link: http://lkml.kernel.org/r/1495138417-6203-5-git-send-email-luca.abeni@santannapisa.it
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Luca Abeni
2017-05-18 22:13:31 +02:00
committed by Ingo Molnar
parent 387e31300b
commit c52f14d384
3 changed files with 21 additions and 2 deletions
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4
kernel/sched/core.c
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@@ -2423,7 +2423,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
unsigned long to_ratio(u64 period, u64 runtime)
{
if (runtime == RUNTIME_INF)
return 1ULL << 20;
return BW_UNIT;
/*
* Doing this here saves a lot of checks in all
@@ -2433,7 +2433,7 @@ unsigned long to_ratio(u64 period, u64 runtime)
if (period == 0)
return 0;
return div64_u64(runtime << 20, period);
return div64_u64(runtime << BW_SHIFT, period);
}
#ifdef CONFIG_SMP