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authorVincent Guittot <vincent.guittot@linaro.org>2018-08-29 16:19:11 +0300
committerIngo Molnar <mingo@kernel.org>2018-12-11 17:16:57 +0300
commit765d0af19f5f388a34bf4533378f8398b72ded46 (patch)
tree77f73b9073c488e02e47f745313ba51186143993 /include/linux/sched/topology.h
parentdfcb245e28481256a10a9133441baf2a93d26642 (diff)
downloadlinux-765d0af19f5f388a34bf4533378f8398b72ded46.tar.xz
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 'include/linux/sched/topology.h')
-rw-r--r--include/linux/sched/topology.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 6b9976180c1e..7fa0bc17cd8c 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -89,7 +89,6 @@ struct sched_domain {
unsigned int newidle_idx;
unsigned int wake_idx;
unsigned int forkexec_idx;
- unsigned int smt_gain;
int nohz_idle; /* NOHZ IDLE status */
int flags; /* See SD_* */