linux-kernel - [PATCH 1/6] mm: Add batch size for free page reporting

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Date:   Tue, 5 Jan 2021 22:47:18 -0500
From:   Liang Li <liliang324@...il.com>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        Liang Li <liliangleo@...iglobal.com>,
        Liang Li <liliang324@...il.com>,
        Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH 1/6] mm: Add batch size for free page reporting

Use the page order as the only threshold for page reporting
is not flexible and has some flaws. Because scan a long free
list is not cheap, it's better to wake up the page reporting
worker when there are more pages, wake it up for a sigle page
may not worth.
This patch add a batch size as another threshold to control the
waking up of reporting worker.

Cc: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Liang Li <liliang324@...il.com>
Signed-off-by: Liang Li <liliangleo@...iglobal.com>
---
 mm/page_reporting.c |  1 +
 mm/page_reporting.h | 12 ++++++++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index cd8e13d41df4..694df981ddd2 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -12,6 +12,7 @@
 
 #define PAGE_REPORTING_DELAY	(2 * HZ)
 static struct page_reporting_dev_info __rcu *pr_dev_info __read_mostly;
+unsigned long page_report_batch_size  __read_mostly = 16 * 1024 * 1024UL;
 
 enum {
 	PAGE_REPORTING_IDLE = 0,
diff --git a/mm/page_reporting.h b/mm/page_reporting.h
index 2c385dd4ddbd..b8fb3bbb345f 100644
--- a/mm/page_reporting.h
+++ b/mm/page_reporting.h
@@ -12,6 +12,8 @@
 
 #define PAGE_REPORTING_MIN_ORDER	pageblock_order
 
+extern unsigned long page_report_batch_size;
+
 #ifdef CONFIG_PAGE_REPORTING
 DECLARE_STATIC_KEY_FALSE(page_reporting_enabled);
 void __page_reporting_notify(void);
@@ -33,6 +35,8 @@ static inline bool page_reported(struct page *page)
  */
 static inline void page_reporting_notify_free(unsigned int order)
 {
+	static long batch_size;
+
 	/* Called from hot path in __free_one_page() */
 	if (!static_branch_unlikely(&page_reporting_enabled))
 		return;
@@ -41,8 +45,12 @@ static inline void page_reporting_notify_free(unsigned int order)
 	if (order < PAGE_REPORTING_MIN_ORDER)
 		return;
 
-	/* This will add a few cycles, but should be called infrequently */
-	__page_reporting_notify();
+	batch_size += (1 << order) << PAGE_SHIFT;
+	if (batch_size >= page_report_batch_size) {
+		batch_size = 0;
+		/* This add a few cycles, but should be called infrequently */
+		__page_reporting_notify();
+	}
 }
 #else /* CONFIG_PAGE_REPORTING */
 #define page_reported(_page)	false
-- 
2.18.2