// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/mm/page_alloc.c
 *
 *  Manages the free list, the system allocates free pages here.
 *  Note that kmalloc() lives in slab.c
 *
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *  Swap reorganised 29.12.95, Stephen Tweedie
 *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
 *  Reshaped it to be a zoned allocator, Ingo Molnar, Red Hat, 1999
 *  Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
 *  Zone balancing, Kanoj Sarcar, SGI, Jan 2000
 *  Per cpu hot/cold page lists, bulk allocation, Martin J. Bligh, Sept 2002
 *          (lots of bits borrowed from Ingo Molnar & Andrew Morton)
 */

/* Extracted unchanged from Linux v6.12, mm/page_alloc.c:3913-3936.
 * Complete named function; surrounding kernel context is required.
 * Source: https://github.com/torvalds/linux/blob/v6.12/mm/page_alloc.c#L3913-L3936
 * License text: GPL-2.0.txt (in this directory).
 */
static unsigned long
__perform_reclaim(gfp_t gfp_mask, unsigned int order,
					const struct alloc_context *ac)
{
	unsigned int noreclaim_flag;
	unsigned long progress;

	cond_resched();

	/* We now go into synchronous reclaim */
	cpuset_memory_pressure_bump();
	fs_reclaim_acquire(gfp_mask);
	noreclaim_flag = memalloc_noreclaim_save();

	progress = try_to_free_pages(ac->zonelist, order, gfp_mask,
								ac->nodemask);

	memalloc_noreclaim_restore(noreclaim_flag);
	fs_reclaim_release(gfp_mask);

	cond_resched();

	return progress;
}