summaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorGavin Shan <gshan@redhat.com>2021-06-28 19:35:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 10:53:47 -0700
commitf58780a8e3851edae5bafb7d3af19425308a37f5 (patch)
tree6a31ccccba13888872c5fc7ebf875cd6a14b5dc4 /mm
parent5631de543acb5c7a740534e727f7432e45a9e6dd (diff)
mm/page_reporting: export reporting order as module parameter
The macro PAGE_REPORTING_MIN_ORDER is defined as the page reporting threshold. It can't be adjusted at runtime. This introduces a variable (@page_reporting_order) to replace the marcro (PAGE_REPORTING_MIN_ORDER). MAX_ORDER is assigned to it initially, meaning the page reporting is disabled. It will be specified by driver if valid one is provided. Otherwise, it will fall back to @pageblock_order. It's also exported so that the page reporting order can be adjusted at runtime. Link: https://lkml.kernel.org/r/20210625014710.42954-3-gshan@redhat.com Signed-off-by: Gavin Shan <gshan@redhat.com> Suggested-by: David Hildenbrand <david@redhat.com> Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_reporting.c9
-rw-r--r--mm/page_reporting.h5
2 files changed, 9 insertions, 5 deletions
diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index df9c5054e1b4..34bf4d26c2c4 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -4,12 +4,17 @@
#include <linux/page_reporting.h>
#include <linux/gfp.h>
#include <linux/export.h>
+#include <linux/module.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include "page_reporting.h"
#include "internal.h"
+unsigned int page_reporting_order = MAX_ORDER;
+module_param(page_reporting_order, uint, 0644);
+MODULE_PARM_DESC(page_reporting_order, "Set page reporting order");
+
#define PAGE_REPORTING_DELAY (2 * HZ)
static struct page_reporting_dev_info __rcu *pr_dev_info __read_mostly;
@@ -229,7 +234,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev,
/* Generate minimum watermark to be able to guarantee progress */
watermark = low_wmark_pages(zone) +
- (PAGE_REPORTING_CAPACITY << PAGE_REPORTING_MIN_ORDER);
+ (PAGE_REPORTING_CAPACITY << page_reporting_order);
/*
* Cancel request if insufficient free memory or if we failed
@@ -239,7 +244,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev,
return err;
/* Process each free list starting from lowest order/mt */
- for (order = PAGE_REPORTING_MIN_ORDER; order < MAX_ORDER; order++) {
+ for (order = page_reporting_order; order < MAX_ORDER; order++) {
for (mt = 0; mt < MIGRATE_TYPES; mt++) {
/* We do not pull pages from the isolate free list */
if (is_migrate_isolate(mt))
diff --git a/mm/page_reporting.h b/mm/page_reporting.h
index 2c385dd4ddbd..c51dbc228b94 100644
--- a/mm/page_reporting.h
+++ b/mm/page_reporting.h
@@ -10,10 +10,9 @@
#include <linux/pgtable.h>
#include <linux/scatterlist.h>
-#define PAGE_REPORTING_MIN_ORDER pageblock_order
-
#ifdef CONFIG_PAGE_REPORTING
DECLARE_STATIC_KEY_FALSE(page_reporting_enabled);
+extern unsigned int page_reporting_order;
void __page_reporting_notify(void);
static inline bool page_reported(struct page *page)
@@ -38,7 +37,7 @@ static inline void page_reporting_notify_free(unsigned int order)
return;
/* Determine if we have crossed reporting threshold */
- if (order < PAGE_REPORTING_MIN_ORDER)
+ if (order < page_reporting_order)
return;
/* This will add a few cycles, but should be called infrequently */