From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
Received: from mail-qt1-f200.google.com (mail-qt1-f200.google.com [209.85.160.200])
	by kanga.kvack.org (Postfix) with ESMTP id 610F78E0002
	for <linux-mm@kvack.org>; Thu,  3 Jan 2019 14:53:50 -0500 (EST)
Received: by mail-qt1-f200.google.com with SMTP id f2so43098331qtg.14
        for <linux-mm@kvack.org>; Thu, 03 Jan 2019 11:53:50 -0800 (PST)
Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65])
        by mx.google.com with SMTPS id k21sor46237762qvh.10.2019.01.03.11.53.49
        for <linux-mm@kvack.org>
        (Google Transport Security);
        Thu, 03 Jan 2019 11:53:49 -0800 (PST)
Subject: Re: [PATCH v3] mm/page_owner: fix for deferred struct page init
References: <20181220185031.43146-1-cai@lca.pw>
 <20181220203156.43441-1-cai@lca.pw> <20190103115114.GL31793@dhcp22.suse.cz>
 <e3ff1455-06cc-063e-24f0-3b525c345b84@lca.pw>
 <20190103165927.GU31793@dhcp22.suse.cz>
 <5d8f3a98-a954-c8ab-83d9-2f94c614f268@lca.pw>
 <20190103190715.GZ31793@dhcp22.suse.cz>
From: Qian Cai <cai@lca.pw>
Message-ID: <62e96e34-7ea9-491a-b5b6-4828da980d48@lca.pw>
Date: Thu, 3 Jan 2019 14:53:47 -0500
MIME-Version: 1.0
In-Reply-To: <20190103190715.GZ31793@dhcp22.suse.cz>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: akpm@linux-foundation.org, Pavel.Tatashin@microsoft.com, mingo@kernel.org, mgorman@techsingularity.net, iamjoonsoo.kim@lge.com, tglx@linutronix.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org

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();