Module compat 

The kernel’s sched_ext flags, 0 where it lacks one, for a scheduler’s user space to choose the ops flags it loads with, see Params::add_flags().

Structs

ARENA_FETCH_BITOPS

The JIT lowers fetching AND, OR and XOR on arena pointers.

LIB_FEATURES

Every probed kernel feature: its name, its bit in the scx_lib_features rodata word or zero when only userspace consults it, and whether the running kernel has it.

PROG_STREAM_OPEN_SUPPORTED

prog_stream_open() works, so BPF streams can be polled.

ROOT_PREFIX

SCX_OPS_ALLOW_QUEUED_WAKEUP

SCX_OPS_ALWAYS_ENQ_IMMED

SCX_OPS_BUILTIN_IDLE_PER_NODE

SCX_OPS_ENQ_BLOCKED

SCX_OPS_ENQ_EXITING

SCX_OPS_ENQ_LAST

SCX_OPS_ENQ_MIGRATION_DISABLED

SCX_OPS_KEEP_BUILTIN_IDLE

SCX_OPS_SWITCH_PARTIAL

SCX_OPS_TID_TO_TASK

SCX_PICK_IDLE_CORE

SCX_PICK_IDLE_IN_NODE

Constants

BPF_F_ARENA_SCALAR

BPF_PROG_LOAD flag under which a load or store through a plain scalar is an arena access, from 4c651a91bdfc in bpf-next. Not yet in the uapi header libbpf-sys 1.7 ships.

SCX_LIB_FEAT_ARENA_FETCH_BITOPS

Functions

check_min_requirements

cond_kprobe_attach

cond_kprobe_enable

cond_kprobe_load

cond_kprobes_enable

cond_tracepoint_enable

cond_tracepoints_enable

debugfs_mount

Returns the debugfs mount point.

function_tracer_available

Whether the kernel supports function tracing (CONFIG_FUNCTION_TRACER), needed for fentry/fexit BPF programs to load or attach. /proc/sys/kernel/ftrace_enabled only exists when it’s compiled in, so its presence is a cheap proxy.

get_fs_mount

Returns the mount point for a filesystem type.

has_rodata_var

Whether an open object has the rodata variable name.

in_kallsyms

is_sched_ext_enabled

ksym_exists

malformed_scx_kfuncs

Scan the running kernel’s vmlinux BTF for scx kfuncs whose public-facing prototype still carries the implicit aux (struct bpf_prog_aux *) argument.

prog_stream_open

Open a read-only descriptor on one of prog’s streams, stream_id being BPF_STREAM_STDOUT or BPF_STREAM_STDERR. Reads block unless nonblock. poll(2) reports POLLIN for data and POLLHUP once the program is freed, with buffered data still readable. A kernel without the command fails with EINVAL.

read_enum

read_enum_any

Read an enum value from the first BTF enum type that contains it.

set_lib_features

Hand the probed features to the BPF side of an open object and log them, at info when the kernel lacks any of them and at debug otherwise.

set_rodata_var

Write value over the rodata variable name of an open object. Returns false when the object has no such variable.

struct_has_field

tracefs_mount

Returns the tracefs mount point.

tracepoint_exists

tracer_available