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cec1e6e5d1
This contains a fix for sched_ext idle CPU selection that likely fixes a substantial performance regression. The scx_bpf_select_cpu_dfl/and() kfuncs were incorrectly detecting all tasks as migration-disabled when called outside ops.select_cpu(), causing them to always return -EBUSY instead of finding idle CPUs. The fix properly distinguishes between genuinely migration-disabled tasks vs. the current task whose migration is temporarily disabled by BPF execution. -----BEGIN PGP SIGNATURE----- iIQEABYKACwWIQTfIjM1kS57o3GsC/uxYfJx3gVYGQUCaNF8hQ4cdGpAa2VybmVs Lm9yZwAKCRCxYfJx3gVYGYhsAPwNeMGqniyewfciL6q+9Yjnxudn+bCzntvTidY/ EbV3vgD9GPily3kjKhuPBGIq5hnyiV1DsmmCTIu8vaj7RB4uYw8= =k2RU -----END PGP SIGNATURE----- Merge tag 'sched_ext-for-6.17-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext Pull sched_ext fix from jun Heo: "This contains a fix for sched_ext idle CPU selection that likely fixes a substantial performance regression. The scx_bpf_select_cpu_dfl/and() kfuncs were incorrectly detecting all tasks as migration-disabled when called outside ops.select_cpu(), causing them to always return -EBUSY instead of finding idle CPUs. The fix properly distinguishes between genuinely migration-disabled tasks vs. the current task whose migration is temporarily disabled by BPF execution" * tag 'sched_ext-for-6.17-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext: sched_ext: idle: Handle migration-disabled tasks in BPF code