// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/mm/oom_kill.c
 *
 *  Copyright (C)  1998,2000  Rik van Riel
 *	Thanks go out to Claus Fischer for some serious inspiration and
 *	for goading me into coding this file...
 *  Copyright (C)  2010  Google, Inc.
 *	Rewritten by David Rientjes
 *
 *  The routines in this file are used to kill a process when
 *  we're seriously out of memory. This gets called from __alloc_pages()
 *  in mm/page_alloc.c when we really run out of memory.
 *
 *  Since we won't call these routines often (on a well-configured
 *  machine) this file will double as a 'coding guide' and a signpost
 *  for newbie kernel hackers. It features several pointers to major
 *  kernel subsystems and hints as to where to find out what things do.
 */

/*
 * Official Linux v6.18: mm/oom_kill.c
 * https://github.com/torvalds/linux/blob/v6.18/mm/oom_kill.c#L425
 * Complete upstream scope, not an elided book-code reconstruction.
 * See GPL-2.0.txt. Not a standalone translation unit.
 */

static void dump_tasks(struct oom_control *oc)
{
	pr_info("Tasks state (memory values in pages):\n");
	pr_info("[  pid  ]   uid  tgid total_vm      rss rss_anon rss_file rss_shmem pgtables_bytes swapents oom_score_adj name\n");

	if (is_memcg_oom(oc))
		mem_cgroup_scan_tasks(oc->memcg, dump_task, oc);
	else {
		struct task_struct *p;
		int i = 0;

		rcu_read_lock();
		for_each_process(p) {
			/* Avoid potential softlockup warning */
			if ((++i & 1023) == 0)
				touch_softlockup_watchdog();
			dump_task(p, oc);
		}
		rcu_read_unlock();
	}
}