buddy allocator

원본 코드:

Linux 6.18.37 LTS: mm/page_alloc.c
Linux 6.18.37 LTS: include/linux/mmzone.h
Linux 6.18.37 LTS: include/linux/page-flags.h

원본 코드: include/linux/gfp.h, 225–227행

struct page *__alloc_pages_noprof(gfp_t gfp, unsigned int order, int preferred_nid,
		nodemask_t *nodemask);
#define __alloc_pages(...)			alloc_hooks(__alloc_pages_noprof(__VA_ARGS__))

원본 코드: mm/page_alloc.c, 5268–5278행

struct page *__alloc_pages_noprof(gfp_t gfp, unsigned int order,
		int preferred_nid, nodemask_t *nodemask)
{
	struct page *page;

	page = __alloc_frozen_pages_noprof(gfp, order, preferred_nid, nodemask);
	if (page)
		set_page_refcounted(page);
	return page;
}
EXPORT_SYMBOL(__alloc_pages_noprof);

원본 코드: mm/page_alloc.c, 5356–5359행

void __free_pages(struct page *page, unsigned int order)
{
	___free_pages(page, order, FPI_NONE);
}

원본 코드: mm/page_alloc.c, 2934–2946행

static void __free_frozen_pages(struct page *page, unsigned int order,
				fpi_t fpi_flags)
{
	unsigned long __maybe_unused UP_flags;
	struct per_cpu_pages *pcp;
	struct zone *zone;
	unsigned long pfn = page_to_pfn(page);
	int migratetype;

	if (!pcp_allowed_order(order)) {
		__free_pages_ok(page, order, fpi_flags);
		return;
	}

원본 코드: mm/page_alloc.c, 2973–2982행

	pcp_trylock_prepare(UP_flags);
	pcp = pcp_spin_trylock(zone->per_cpu_pageset);
	if (pcp) {
		free_frozen_page_commit(zone, pcp, page, migratetype, order, fpi_flags);
		pcp_spin_unlock(pcp);
	} else {
		free_one_page(zone, page, pfn, order, fpi_flags);
	}
	pcp_trylock_finish(UP_flags);
}