Re: [PATCH v3] mm/page_owner: fix for deferred struct page init

[Qian Cai <cai@xxxxxx>]

On 1/3/19 2:07 PM, Michal Hocko wrote> So can we make the revert with an
explanation that the patch was wrong?
> If we want to make hacks to catch more objects to be tracked then it
> would be great to have some numbers in hands.

Well, those numbers are subject to change depends on future start_kernel()
order. Right now, there are many functions could be caught earlier by page owner.

	kmemleak_init();
	debug_objects_mem_init();
	setup_per_cpu_pageset();
	numa_policy_init();
	acpi_early_init();
	if (late_time_init)
		late_time_init();
	sched_clock_init();
	calibrate_delay();
	pid_idr_init();
	anon_vma_init();
#ifdef CONFIG_X86
	if (efi_enabled(EFI_RUNTIME_SERVICES))
		efi_enter_virtual_mode();
#endif
	thread_stack_cache_init();
	cred_init();
	fork_init();
	proc_caches_init();
	uts_ns_init();
	buffer_init();
	key_init();
	security_init();
	dbg_late_init();
	vfs_caches_init();
	pagecache_init();
	signals_init();
	seq_file_init();
	proc_root_init();
	nsfs_init();
	cpuset_init();
	cgroup_init();
	taskstats_init_early();
	delayacct_init();

	check_bugs();

	acpi_subsystem_init();
	arch_post_acpi_subsys_init();
	sfi_init_late();

	if (efi_enabled(EFI_RUNTIME_SERVICES)) {
		efi_free_boot_services();

	rcu_scheduler_starting();
	/*
	 * Wait until kthreadd is all set-up.
	 */
	wait_for_completion(&kthreadd_done);

	/* Now the scheduler is fully set up and can do blocking allocations */
	gfp_allowed_mask = __GFP_BITS_MASK;

	/*
	 * init can allocate pages on any node
	 */
	set_mems_allowed(node_states[N_MEMORY]);

	cad_pid = task_pid(current);

	smp_prepare_cpus(setup_max_cpus);

	workqueue_init();

	init_mm_internals();

	do_pre_smp_initcalls();
	lockup_detector_init();

	smp_init();
	sched_init_smp();