sched/topology: Remove the ::smt_gain field from 'struct sched_domain'
::smt_gain is used to compute the capacity of CPUs of a SMT core with the
constraint 1 < ::smt_gain < 2 in order to be able to compute number of CPUs
per core. The field has_free_capacity of struct numa_stat, which was the
last user of this computation of number of CPUs per core, has been removed
by:
2d4056fafa
("sched/numa: Remove numa_has_capacity()")
We can now remove this constraint on core capacity and use the defautl value
SCHED_CAPACITY_SCALE for SMT CPUs. With this remove, SCHED_CAPACITY_SCALE
becomes the maximum compute capacity of CPUs on every systems. This should
help to simplify some code and remove fields like rd->max_cpu_capacity
Furthermore, arch_scale_cpu_capacity() is used with a NULL sd in several other
places in the code when it wants the capacity of a CPUs to scale
some metrics like in pelt, deadline or schedutil. In case on SMT, the value
returned is not the capacity of SMT CPUs but default SCHED_CAPACITY_SCALE.
So remove it.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1535548752-4434-4-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
parent
dfcb245e28
commit
765d0af19f
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@ -89,7 +89,6 @@ struct sched_domain {
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unsigned int newidle_idx;
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unsigned int wake_idx;
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unsigned int forkexec_idx;
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unsigned int smt_gain;
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int nohz_idle; /* NOHZ IDLE status */
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int flags; /* See SD_* */
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@ -1864,9 +1864,6 @@ unsigned long arch_scale_freq_capacity(int cpu)
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static __always_inline
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unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
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{
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if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
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return sd->smt_gain / sd->span_weight;
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return SCHED_CAPACITY_SCALE;
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}
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#endif
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@ -1133,7 +1133,6 @@ sd_init(struct sched_domain_topology_level *tl,
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.last_balance = jiffies,
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.balance_interval = sd_weight,
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.smt_gain = 0,
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.max_newidle_lb_cost = 0,
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.next_decay_max_lb_cost = jiffies,
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.child = child,
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@ -1164,7 +1163,6 @@ sd_init(struct sched_domain_topology_level *tl,
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if (sd->flags & SD_SHARE_CPUCAPACITY) {
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sd->imbalance_pct = 110;
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sd->smt_gain = 1178; /* ~15% */
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} else if (sd->flags & SD_SHARE_PKG_RESOURCES) {
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sd->imbalance_pct = 117;
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