bpf: introduce and use rcu_migrate_{enable,disable} #5754
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migrate_disable() is called to disable migration in the kernel, and it is used togather with rcu_read_lock() oftenly. However, with PREEMPT_RCU disabled, it's unnecessary, as rcu_read_lock() will disable preemption, which will also disable migration. Introduce rcu_migrate_enable() and rcu_migrate_disable(), which will do the migration enable and disable only when the rcu_read_lock() can't do it. Signed-off-by: Menglong Dong <[email protected]>
Replace the migrate_disable/migrate_enable with rcu_migrate_disable/rcu_migrate_enable in bpf_cgrp_storage_free to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <[email protected]>
Replace the migrate_disable/migrate_enable with rcu_migrate_disable/rcu_migrate_enable in bpf_inode_storage_free to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <[email protected]>
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Replace the migrate_disable/migrate_enable with rcu_migrate_disable/rcu_migrate_enable in bpf_iter_run_prog to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <[email protected]>
Replace the migrate_disable/migrate_enable with rcu_migrate_disable/rcu_migrate_enable in bpf_task_storage_free to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <[email protected]>
Replace the migrate_disable/migrate_enable with rcu_migrate_disable/rcu_migrate_enable in bpf_prog_run_array_cg to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <[email protected]>
Replace the migrate_disable/migrate_enable with rcu_migrate_disable/rcu_migrate_enable in trampoline.c to obtain better performance when PREEMPT_RCU is not enabled. Signed-off-by: Menglong Dong <[email protected]>
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Pull request for series with
subject: bpf: introduce and use rcu_migrate_{enable,disable}
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=991794