On Sun, 4 Sep 2022 18:32:58 -0700
Suren Baghdasaryan [off-list ref] wrote:

Page allocations (overheads are compared to get_free_pages() duration):
6.8% Codetag counter manipulations (__lazy_percpu_counter_add + __alloc_tag_add)
8.8% lookup_page_ext
1237% call stack capture
139% tracepoint with attached empty BPF program

Have you tried tracepoint with custom callback?

static void my_callback(void *data, unsigned long call_site,
			const void *ptr, struct kmem_cache *s,
			size_t bytes_req, size_t bytes_alloc,
			gfp_t gfp_flags)
{
	struct my_data_struct *my_data = data;

	{ do whatever }
}

[..]
	register_trace_kmem_alloc(my_callback, my_data);

Now the my_callback function will be called directly every time the
kmem_alloc tracepoint is hit.

This avoids that perf and BPF overhead.

-- Steve