diff options
| author |   Vincent Guittot <vincent.guittot@linaro.org> | 2018-08-29 15:19:11 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-12-11 15:16:57 +0100 |
| commit | 765d0af19f5f388a34bf4533378f8398b72ded46 (patch) | |
| tree | 77f73b9073c488e02e47f745313ba51186143993 /kernel/sched | |
| parent | sched: Fix various typos in comments (diff) | |
| download | linux-dev-765d0af19f5f388a34bf4533378f8398b72ded46.tar.xz linux-dev-765d0af19f5f388a34bf4533378f8398b72ded46.zip | |
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:
2d4056fafa19 ("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>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/sched.h | 3 | ||||
| -rw-r--r-- | kernel/sched/topology.c | 2 |
2 files changed, 0 insertions, 5 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 9bde60a11805..ceb896404869 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1864,9 +1864,6 @@ unsigned long arch_scale_freq_capacity(int cpu) static __always_inline unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu) { - if (sd && (sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1)) - return sd->smt_gain / sd->span_weight; - return SCHED_CAPACITY_SCALE; } #endif diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 8d7f15ba5916..7364e0b427b7 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -1133,7 +1133,6 @@ sd_init(struct sched_domain_topology_level *tl, .last_balance = jiffies, .balance_interval = sd_weight, - .smt_gain = 0, .max_newidle_lb_cost = 0, .next_decay_max_lb_cost = jiffies, .child = child, @@ -1164,7 +1163,6 @@ sd_init(struct sched_domain_topology_level *tl, if (sd->flags & SD_SHARE_CPUCAPACITY) { sd->imbalance_pct = 110; - sd->smt_gain = 1178; /* ~15% */ } else if (sd->flags & SD_SHARE_PKG_RESOURCES) { sd->imbalance_pct = 117; |