linux-IllusionX/mm/page_reporting.h
Gavin Shan f58780a8e3 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>
2021-06-29 10:53:47 -07:00

53 lines
1.6 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _MM_PAGE_REPORTING_H
#define _MM_PAGE_REPORTING_H
#include <linux/mmzone.h>
#include <linux/pageblock-flags.h>
#include <linux/page-isolation.h>
#include <linux/jump_label.h>
#include <linux/slab.h>
#include <linux/pgtable.h>
#include <linux/scatterlist.h>
#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)
{
return static_branch_unlikely(&page_reporting_enabled) &&
PageReported(page);
}
/**
* page_reporting_notify_free - Free page notification to start page processing
*
* This function is meant to act as a screener for __page_reporting_notify
* which will determine if a give zone has crossed over the high-water mark
* that will justify us beginning page treatment. If we have crossed that
* threshold then it will start the process of pulling some pages and
* placing them in the batch list for treatment.
*/
static inline void page_reporting_notify_free(unsigned int order)
{
/* Called from hot path in __free_one_page() */
if (!static_branch_unlikely(&page_reporting_enabled))
return;
/* Determine if we have crossed reporting threshold */
if (order < page_reporting_order)
return;
/* This will add a few cycles, but should be called infrequently */
__page_reporting_notify();
}
#else /* CONFIG_PAGE_REPORTING */
#define page_reported(_page) false
static inline void page_reporting_notify_free(unsigned int order)
{
}
#endif /* CONFIG_PAGE_REPORTING */
#endif /*_MM_PAGE_REPORTING_H */