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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>
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@ -3566,6 +3566,12 @@
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off: turn off poisoning (default)
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on: turn on poisoning
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page_reporting.page_reporting_order=
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[KNL] Minimal page reporting order
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Format: <integer>
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Adjust the minimal page reporting order. The page
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reporting is disabled when it exceeds (MAX_ORDER-1).
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panic= [KNL] Kernel behaviour on panic: delay <timeout>
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timeout > 0: seconds before rebooting
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timeout = 0: wait forever
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@ -4,12 +4,17 @@
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#include <linux/page_reporting.h>
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#include <linux/gfp.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/scatterlist.h>
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#include "page_reporting.h"
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#include "internal.h"
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unsigned int page_reporting_order = MAX_ORDER;
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module_param(page_reporting_order, uint, 0644);
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MODULE_PARM_DESC(page_reporting_order, "Set page reporting order");
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#define PAGE_REPORTING_DELAY (2 * HZ)
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static struct page_reporting_dev_info __rcu *pr_dev_info __read_mostly;
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@ -229,7 +234,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev,
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/* Generate minimum watermark to be able to guarantee progress */
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watermark = low_wmark_pages(zone) +
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(PAGE_REPORTING_CAPACITY << PAGE_REPORTING_MIN_ORDER);
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(PAGE_REPORTING_CAPACITY << page_reporting_order);
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/*
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* Cancel request if insufficient free memory or if we failed
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@ -239,7 +244,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev,
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return err;
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/* Process each free list starting from lowest order/mt */
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for (order = PAGE_REPORTING_MIN_ORDER; order < MAX_ORDER; order++) {
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for (order = page_reporting_order; order < MAX_ORDER; order++) {
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for (mt = 0; mt < MIGRATE_TYPES; mt++) {
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/* We do not pull pages from the isolate free list */
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if (is_migrate_isolate(mt))
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@ -10,10 +10,9 @@
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#include <linux/pgtable.h>
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#include <linux/scatterlist.h>
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#define PAGE_REPORTING_MIN_ORDER pageblock_order
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#ifdef CONFIG_PAGE_REPORTING
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DECLARE_STATIC_KEY_FALSE(page_reporting_enabled);
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extern unsigned int page_reporting_order;
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void __page_reporting_notify(void);
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static inline bool page_reported(struct page *page)
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@ -38,7 +37,7 @@ static inline void page_reporting_notify_free(unsigned int order)
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return;
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/* Determine if we have crossed reporting threshold */
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if (order < PAGE_REPORTING_MIN_ORDER)
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if (order < page_reporting_order)
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return;
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/* This will add a few cycles, but should be called infrequently */
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