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198f0f4c58
This makes the default monitoring primitives for virtual address spaces and the physical address sapce to support memory regions prioritization for 'PAGEOUT' DAMOS action. It calculates hotness of each region as weighted sum of 'nr_accesses' and 'age' of the region and get the priority score as reverse of the hotness, so that cold regions can be paged out first. Link: https://lkml.kernel.org/r/20211019150731.16699-9-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Amit Shah <amit@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Hildenbrand <david@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: David Woodhouse <dwmw@amazon.com> Cc: Greg Thelen <gthelen@google.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Leonard Foerster <foersleo@amazon.de> Cc: Marco Elver <elver@google.com> Cc: Markus Boehme <markubo@amazon.de> Cc: Shakeel Butt <shakeelb@google.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
20 lines
576 B
C
20 lines
576 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common Primitives for Data Access Monitoring
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*
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* Author: SeongJae Park <sj@kernel.org>
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*/
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#include <linux/damon.h>
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#include <linux/random.h>
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/* Get a random number in [l, r) */
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#define damon_rand(l, r) (l + prandom_u32_max(r - l))
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struct page *damon_get_page(unsigned long pfn);
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void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr);
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void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr);
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int damon_pageout_score(struct damon_ctx *c, struct damon_region *r,
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struct damos *s);
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