sched/cache: Allow only 1 thread of the process to calculate the LLC occupancy

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Scanning online CPUs to calculate the occupancy might be
time-consuming. Only allow 1 thread of the process to scan
the CPUs at the same time, which is similar to what
NUMA balance does in task_numa_work().

Signed-off-by: Jianyong Wu <wujianyong@hygon.cn>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/5672b52e588b855b01e5a1a17822f7c6c7237a3d.1778703694.git.tim.c.chen@linux.intel.com

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Jianyong Wu 2026-05-13 13:39:12 -07:00 • committed by Peter Zijlstra

parent 067a313581

commit a2b4cf39d9

2 changed files with 12 additions and 0 deletions

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1

include/linux/sched.h

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11

kernel/sched/fair.c

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