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authorGavin Shan <gshan@redhat.com>2021-06-28 19:35:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 10:53:47 -0700
commit9f849c6f9572d8cef407f55928d3dc68fc42ad3e (patch)
tree7a8c8c792098f1061438db886a60fe87212a38fc /mm
parentf58780a8e3851edae5bafb7d3af19425308a37f5 (diff)
mm/page_reporting: allow driver to specify reporting order
The page reporting order (threshold) is sticky to @pageblock_order by default. The page reporting can never be triggered because the freeing page can't come up with a free area like that huge. The situation becomes worse when the system memory becomes heavily fragmented. For example, the following configurations are used on ARM64 when 64KB base page size is enabled. In this specific case, the page reporting won't be triggered until the freeing page comes up with a 512MB free area. That's hard to be met, especially when the system memory becomes heavily fragmented. PAGE_SIZE: 64KB HPAGE_SIZE: 512MB pageblock_order: 13 (512MB) MAX_ORDER: 14 This allows the drivers to specify the page reporting order when the page reporting device is registered. It falls back to @pageblock_order if it's not specified by the driver. The existing users (hv_balloon and virtio_balloon) don't specify it and @pageblock_order is still taken as their page reporting order. So this shouldn't introduce any functional changes. Link: https://lkml.kernel.org/r/20210625014710.42954-4-gshan@redhat.com Signed-off-by: Gavin Shan <gshan@redhat.com> Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: David Hildenbrand <david@redhat.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.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index 34bf4d26c2c4..382958eef8a9 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -329,6 +329,12 @@ int page_reporting_register(struct page_reporting_dev_info *prdev)
goto err_out;
}
+ /*
+ * Update the page reporting order if it's specified by driver.
+ * Otherwise, it falls back to @pageblock_order.
+ */
+ page_reporting_order = prdev->order ? : pageblock_order;
+
/* initialize state and work structures */
atomic_set(&prdev->state, PAGE_REPORTING_IDLE);
INIT_DELAYED_WORK(&prdev->work, &page_reporting_process);