path: root/fs
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authorQuentin Perret <>2019-09-20 11:41:15 +0200
committerIngo Molnar <>2019-09-25 17:42:32 +0200
commit4892f51ad54ddff2883a60b6ad4323c1f632a9d6 (patch)
treefae92c41feea34131bc861123220f2efb33bdd6a /fs
parent9fc41acc89e58262c917b4be89ef00a87485804f (diff)
sched/fair: Avoid redundant EAS calculation
The EAS wake-up path computes the system energy for several CPU candidates: the CPU with maximum spare capacity in each performance domain, and the prev_cpu. However, if prev_cpu also happens to be the CPU with maximum spare capacity in its performance domain, the energy calculation is still done twice, unnecessarily. Add a condition to filter out this corner case before doing the energy calculation. Reported-by: Pavan Kondeti <> Signed-off-by: Quentin Perret <> Signed-off-by: Peter Zijlstra (Intel) <> Cc: Linus Torvalds <> Cc: Peter Zijlstra <> Cc: Thomas Gleixner <> Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Fixes: eb92692b2544 ("sched/fair: Speed-up energy-aware wake-ups") Link: Signed-off-by: Ingo Molnar <>
Diffstat (limited to 'fs')
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