Sync from sched_ext/for-6.11 1edab907b57d ("sched_ext/scx_qmap: Pick idle
CPU for direct dispatch on !wakeup enqueues")
git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git for-6.11
- cgroup support hasn't landed in the upstream kernel yet. This most likely
will happen in a few weeks. For the time being, disable scx_flatcg,
scx_pair and scx_mitosis.
- Compat macro for DSQ task iterator dropped. This is now a part of
the baseline.
- scx_bpf_consume() isn't upstream yet. BPF interfacing side is still being
discussed. Dropped example usage from tools/sched_ext. None of the
practical schedulers use it, so this should be fine for now.
- scx_bpf_cpu_rq() added.
- AUTOATTACH workaround for newer libbpf versions added.
__COMPAT_scx_bpf_consume_task() wasn't calling scx_bpf_consume_task() at all
and was always returning false. Fix it.
Also, update scx_qmap usage example so that it matches cgroup ID rather than
comm prefix. This should make testing with multiple processes a bit easier.
In preparation of upstreaming, let's set the min version requirement at the
released v6.9 kernels. Drop __COMPAT_scx_bpf_switch_call(). The open helper
macros now check the existence of SCX_OPS_SWITCH_PARTIAL and abort if not.
C SCX_OPS_ATTACH() and rust scx_ops_attach() macros were not calling
.attach() and were only attaching the struct_ops. This meant that all
non-struct_ops BPF programs contained in the skels were never attached which
breaks e.g. scx_layered.
Let's fix it by adding .attach() invocation the the attach macros.
Sync from kernel to receive new vmlinux.h and the updates to common headers.
This includes the following updates:
- scx_bpf_switch_all() is replaced by SCX_OPS_SWITCH_PARTIAL flag.
- sched_ext_ops.exit_dump_len added to allow customizing dump buffer size.
- scx_bpf_exit() added.
- Common headers updated to provide backward compatibility in a way which
hides most complexities from scheduler implementations.
scx_simple, qmap, central and flatcg are updated accordingly. Other
schedulers are broken for the moment.
- combine c and kernel-examples as it's confusing to have both
- rename 'rust-user' and 'c-user' to just 'rust' and 'c', which is simpler
- update and fix sync-to-kernel.sh
