mm: remove cold parameter from free_hot_cold_page*

Most callers users of free_hot_cold_page claim the pages being released
are cache hot.  The exception is the page reclaim paths where it is
likely that enough pages will be freed in the near future that the
per-cpu lists are going to be recycled and the cache hotness information
is lost.  As no one really cares about the hotness of pages being
released to the allocator, just ditch the parameter.

The APIs are renamed to indicate that it's no longer about hot/cold
pages.  It should also be less confusing as there are subtle differences
between them.  __free_pages drops a reference and frees a page when the
refcount reaches zero.  free_hot_cold_page handled pages whose refcount
was already zero which is non-obvious from the name.  free_unref_page
should be more obvious.

No performance impact is expected as the overhead is marginal.  The
parameter is removed simply because it is a bit stupid to have a useless
parameter copied everywhere.

[mgorman@techsingularity.net: add pages to head, not tail]
  Link: http://lkml.kernel.org/r/20171019154321.qtpzaeftoyyw4iey@techsingularity.net
Link: http://lkml.kernel.org/r/20171018075952.10627-8-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 18 insertions, 23 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6a3c4a1..f265d37 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2611,7 +2611,7 @@ void mark_free_pages(struct zone *zone)
 }
 #endif /* CONFIG_PM */
 
-static bool free_hot_cold_page_prepare(struct page *page, unsigned long pfn)
+static bool free_unref_page_prepare(struct page *page, unsigned long pfn)
 {
 	int migratetype;
 
@@ -2623,8 +2623,7 @@ static bool free_hot_cold_page_prepare(struct page *page, unsigned long pfn)
 	return true;
 }
 
-static void free_hot_cold_page_commit(struct page *page, unsigned long pfn,
-				bool cold)
+static void free_unref_page_commit(struct page *page, unsigned long pfn)
 {
 	struct zone *zone = page_zone(page);
 	struct per_cpu_pages *pcp;
@@ -2649,10 +2648,7 @@ static void free_hot_cold_page_commit(struct page *page, unsigned long pfn,
 	}
 
 	pcp = &this_cpu_ptr(zone->pageset)->pcp;
-	if (!cold)
-		list_add(&page->lru, &pcp->lists[migratetype]);
-	else
-		list_add_tail(&page->lru, &pcp->lists[migratetype]);
+	list_add(&page->lru, &pcp->lists[migratetype]);
 	pcp->count++;
 	if (pcp->count >= pcp->high) {
 		unsigned long batch = READ_ONCE(pcp->batch);
@@ -2663,25 +2659,24 @@ static void free_hot_cold_page_commit(struct page *page, unsigned long pfn,
 
 /*
  * Free a 0-order page
- * cold == true ? free a cold page : free a hot page
  */
-void free_hot_cold_page(struct page *page, bool cold)
+void free_unref_page(struct page *page)
 {
 	unsigned long flags;
 	unsigned long pfn = page_to_pfn(page);
 
-	if (!free_hot_cold_page_prepare(page, pfn))
+	if (!free_unref_page_prepare(page, pfn))
 		return;
 
 	local_irq_save(flags);
-	free_hot_cold_page_commit(page, pfn, cold);
+	free_unref_page_commit(page, pfn);
 	local_irq_restore(flags);
 }
 
 /*
  * Free a list of 0-order pages
  */
-void free_hot_cold_page_list(struct list_head *list, bool cold)
+void free_unref_page_list(struct list_head *list)
 {
 	struct page *page, *next;
 	unsigned long flags, pfn;
@@ -2689,7 +2684,7 @@ void free_hot_cold_page_list(struct list_head *list, bool cold)
 	/* Prepare pages for freeing */
 	list_for_each_entry_safe(page, next, list, lru) {
 		pfn = page_to_pfn(page);
-		if (!free_hot_cold_page_prepare(page, pfn))
+		if (!free_unref_page_prepare(page, pfn))
 			list_del(&page->lru);
 		set_page_private(page, pfn);
 	}
@@ -2699,8 +2694,8 @@ void free_hot_cold_page_list(struct list_head *list, bool cold)
 		unsigned long pfn = page_private(page);
 
 		set_page_private(page, 0);
-		trace_mm_page_free_batched(page, cold);
-		free_hot_cold_page_commit(page, pfn, cold);
+		trace_mm_page_free_batched(page);
+		free_unref_page_commit(page, pfn);
 	}
 	local_irq_restore(flags);
 }
@@ -4301,7 +4296,7 @@ void __free_pages(struct page *page, unsigned int order)
 {
 	if (put_page_testzero(page)) {
 		if (order == 0)
-			free_hot_cold_page(page, false);
+			free_unref_page(page);
 		else
 			__free_pages_ok(page, order);
 	}
@@ -4359,7 +4354,7 @@ void __page_frag_cache_drain(struct page *page, unsigned int count)
 		unsigned int order = compound_order(page);
 
 		if (order == 0)
-			free_hot_cold_page(page, false);
+			free_unref_page(page);
 		else
 			__free_pages_ok(page, order);
 	}
diff --git a/mm/rmap.c b/mm/rmap.c
index 6b5a0f2..47db27f 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1321,7 +1321,7 @@ void page_remove_rmap(struct page *page, bool compound)
 	 * It would be tidy to reset the PageAnon mapping here,
 	 * but that might overwrite a racing page_add_anon_rmap
 	 * which increments mapcount after us but sets mapping
-	 * before us: so leave the reset to free_hot_cold_page,
+	 * before us: so leave the reset to free_unref_page,
 	 * and remember that it's only reliable while mapped.
 	 * Leaving it set also helps swapoff to reinstate ptes
 	 * faster for those pages still in swapcache.
diff --git a/mm/swap.c b/mm/swap.c
index 29cf75f..b480279 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -76,7 +76,7 @@ static void __page_cache_release(struct page *page)
 static void __put_single_page(struct page *page)
 {
 	__page_cache_release(page);
-	free_hot_cold_page(page, false);
+	free_unref_page(page);
 }
 
 static void __put_compound_page(struct page *page)
@@ -817,7 +817,7 @@ void release_pages(struct page **pages, int nr)
 		spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags);
 
 	mem_cgroup_uncharge_list(&pages_to_free);
-	free_hot_cold_page_list(&pages_to_free, 0);
+	free_unref_page_list(&pages_to_free);
 }
 EXPORT_SYMBOL(release_pages);
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 2852b8c..c02c850 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1349,7 +1349,7 @@ keep:
 
 	mem_cgroup_uncharge_list(&free_pages);
 	try_to_unmap_flush();
-	free_hot_cold_page_list(&free_pages, true);
+	free_unref_page_list(&free_pages);
 
 	list_splice(&ret_pages, page_list);
 	count_vm_events(PGACTIVATE, pgactivate);
@@ -1824,7 +1824,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
 	spin_unlock_irq(&pgdat->lru_lock);
 
 	mem_cgroup_uncharge_list(&page_list);
-	free_hot_cold_page_list(&page_list, true);
+	free_unref_page_list(&page_list);
 
 	/*
 	 * If reclaim is isolating dirty pages under writeback, it implies
@@ -2063,7 +2063,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
 	spin_unlock_irq(&pgdat->lru_lock);
 
 	mem_cgroup_uncharge_list(&l_hold);
-	free_hot_cold_page_list(&l_hold, true);
+	free_unref_page_list(&l_hold);
 	trace_mm_vmscan_lru_shrink_active(pgdat->node_id, nr_taken, nr_activate,
 			nr_deactivate, nr_rotated, sc->priority, file);
 }