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authorValentin Schneider <valentin.schneider@arm.com>2021-08-18 13:13:33 +0530
committerPeter Zijlstra <peterz@infradead.org>2021-08-20 12:32:57 +0200
commit0083242c93759dde353a963a90cb351c5c283379 (patch)
tree04bca15e37cee34811bc8b7e871cc2dbf083f223 /kernel/sched/fair.c
parent746f5ea9c4283d98353c1cd41864aec475e0edbd (diff)
downloadlwn-0083242c93759dde353a963a90cb351c5c283379.tar.gz
lwn-0083242c93759dde353a963a90cb351c5c283379.zip
sched/topology: Skip updating masks for non-online nodes
The scheduler currently expects NUMA node distances to be stable from init onwards, and as a consequence builds the related data structures once-and-for-all at init (see sched_init_numa()). Unfortunately, on some architectures node distance is unreliable for offline nodes and may very well change upon onlining. Skip over offline nodes during sched_init_numa(). Track nodes that have been onlined at least once, and trigger a build of a node's NUMA masks when it is first onlined post-init. Reported-by: Geetika Moolchandani <Geetika.Moolchandani1@ibm.com> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210818074333.48645-1-srikar@linux.vnet.ibm.com
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