KFunc `scx_bpf_cid_curr`

v7.2

Return the current task on the CPU at cid.

Definition

cid-addressed equivalent of scx_bpf_cpu_curr. Callers must hold RCU read lock (KF_RCU).

Parameters

cid: cid of interest

Returns

Return the current task on the CPU at cid.

Signature

struct task_struct *scx_bpf_cid_curr(s32 cid)

Note

The pointer returned by the kfunc may be NULL. Hence, it forces the user to do a NULL check on the pointer returned from the kfunc before making use of it (dereferencing or passing to another helper).

Note

This kfunc is RCU protected. This means that the kfunc can be called from RCU read-side critical section. If a program isn't called from RCU read-side critical section, such as sleepable programs, the bpf_rcu_read_lock and bpf_rcu_read_unlock to protect the calls to such KFuncs.

Usage

Docs could be improved

This part of the docs is incomplete, contributions are very welcome

Program types

The following program types can make use of this kfunc:

Example