mm: introduce BPF kfuncs to access memcg statistics and events

Introduce BPF kfuncs to conveniently access memcg data:
  - bpf_mem_cgroup_vm_events(),
  - bpf_mem_cgroup_memory_events(),
  - bpf_mem_cgroup_usage(),
  - bpf_mem_cgroup_page_state(),
  - bpf_mem_cgroup_flush_stats().

These functions are useful for implementing BPF OOM policies, but
also can be used to accelerate access to the memcg data. Reading
it through cgroupfs is much more expensive, roughly 5x, mostly
because of the need to convert the data into the text and back.

JP Kobryn:
An experiment was setup to compare the performance of a program that
uses the traditional method of reading memory.stat vs a program using
the new kfuncs. The control program opens up the root memory.stat file
and for 1M iterations reads, converts the string values to numeric data,
then seeks back to the beginning. The experimental program sets up the
requisite libbpf objects and for 1M iterations invokes a bpf program
which uses the kfuncs to fetch all available stats for node_stat_item,
memcg_stat_item, and vm_event_item types.

The results showed a significant perf benefit on the experimental side,
outperforming the control side by a margin of 93%. In kernel mode,
elapsed time was reduced by 80%, while in user mode, over 99% of time
was saved.

control: elapsed time
real    0m38.318s
user    0m25.131s
sys     0m13.070s

experiment: elapsed time
real    0m2.789s
user    0m0.187s
sys     0m2.512s

control: perf data
33.43% a.out libc.so.6         [.] __vfscanf_internal
 6.88% a.out [kernel.kallsyms] [k] vsnprintf
 6.33% a.out libc.so.6         [.] _IO_fgets
 5.51% a.out [kernel.kallsyms] [k] format_decode
 4.31% a.out libc.so.6         [.] __GI_____strtoull_l_internal
 3.78% a.out [kernel.kallsyms] [k] string
 3.53% a.out [kernel.kallsyms] [k] number
 2.71% a.out libc.so.6         [.] _IO_sputbackc
 2.41% a.out [kernel.kallsyms] [k] strlen
 1.98% a.out a.out             [.] main
 1.70% a.out libc.so.6         [.] _IO_getline_info
 1.51% a.out libc.so.6         [.] __isoc99_sscanf
 1.47% a.out [kernel.kallsyms] [k] memory_stat_format
 1.47% a.out [kernel.kallsyms] [k] memcpy_orig
 1.41% a.out [kernel.kallsyms] [k] seq_buf_printf

experiment: perf data
10.55% memcgstat bpf_prog_..._query [k] bpf_prog_16aab2f19fa982a7_query
 6.90% memcgstat [kernel.kallsyms]  [k] memcg_page_state_output
 3.55% memcgstat [kernel.kallsyms]  [k] _raw_spin_lock
 3.12% memcgstat [kernel.kallsyms]  [k] memcg_events
 2.87% memcgstat [kernel.kallsyms]  [k] __memcg_slab_post_alloc_hook
 2.73% memcgstat [kernel.kallsyms]  [k] kmem_cache_free
 2.70% memcgstat [kernel.kallsyms]  [k] entry_SYSRETQ_unsafe_stack
 2.25% memcgstat [kernel.kallsyms]  [k] __memcg_slab_free_hook
 2.06% memcgstat [kernel.kallsyms]  [k] get_page_from_freelist

Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Co-developed-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Link: https://lore.kernel.org/r/20251223044156.208250-5-roman.gushchin@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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