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6614a3c316
Pull MM updates from Andrew Morton:
"Most of the MM queue. A few things are still pending.
Liam's maple tree rework didn't make it. This has resulted in a few
other minor patch series being held over for next time.
Multi-gen LRU still isn't merged as we were waiting for mapletree to
stabilize. The current plan is to merge MGLRU into -mm soon and to
later reintroduce mapletree, with a view to hopefully getting both
into 6.1-rc1.
Summary:
- The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe
Lin, Yang Shi, Anshuman Khandual and Mike Rapoport
- Some kmemleak fixes from Patrick Wang and Waiman Long
- DAMON updates from SeongJae Park
- memcg debug/visibility work from Roman Gushchin
- vmalloc speedup from Uladzislau Rezki
- more folio conversion work from Matthew Wilcox
- enhancements for coherent device memory mapping from Alex Sierra
- addition of shared pages tracking and CoW support for fsdax, from
Shiyang Ruan
- hugetlb optimizations from Mike Kravetz
- Mel Gorman has contributed some pagealloc changes to improve
latency and realtime behaviour.
- mprotect soft-dirty checking has been improved by Peter Xu
- Many other singleton patches all over the place"
[ XFS merge from hell as per Darrick Wong in
https://lore.kernel.org/all/YshKnxb4VwXycPO8@magnolia/ ]
* tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (282 commits)
tools/testing/selftests/vm/hmm-tests.c: fix build
mm: Kconfig: fix typo
mm: memory-failure: convert to pr_fmt()
mm: use is_zone_movable_page() helper
hugetlbfs: fix inaccurate comment in hugetlbfs_statfs()
hugetlbfs: cleanup some comments in inode.c
hugetlbfs: remove unneeded header file
hugetlbfs: remove unneeded hugetlbfs_ops forward declaration
hugetlbfs: use helper macro SZ_1{K,M}
mm: cleanup is_highmem()
mm/hmm: add a test for cross device private faults
selftests: add soft-dirty into run_vmtests.sh
selftests: soft-dirty: add test for mprotect
mm/mprotect: fix soft-dirty check in can_change_pte_writable()
mm: memcontrol: fix potential oom_lock recursion deadlock
mm/gup.c: fix formatting in check_and_migrate_movable_page()
xfs: fail dax mount if reflink is enabled on a partition
mm/memcontrol.c: remove the redundant updating of stats_flush_threshold
userfaultfd: don't fail on unrecognized features
hugetlb_cgroup: fix wrong hugetlb cgroup numa stat
...
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.. include:: ../disclaimer-zh_CN.rst
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:Original: Documentation/mm/free_page_reporting.rst
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:翻译:
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司延腾 Yanteng Si <siyanteng@loongson.cn>
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:校译:
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==========
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空闲页报告
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==========
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空闲页报告是一个API，设备可以通过它来注册接收系统当前未使用的页面列表。这在虚拟
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化的情况下是很有用的，客户机能够使用这些数据来通知管理器它不再使用内存中的某些页
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面。
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对于驱动，通常是气球驱动要使用这个功能，它将分配和初始化一个page_reporting_dev_info
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结构体。它要填充的结构体中的字段是用于处理散点列表的 "report" 函数指针。它还必
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须保证每次调用该函数时能处理至少相当于PAGE_REPORTING_CAPACITY的散点列表条目。
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假设没有其他页面报告设备已经注册， 对page_reporting_register的调用将向报告框
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架注册页面报告接口。
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一旦注册，页面报告API将开始向驱动报告成批的页面。API将在接口被注册后2秒开始报告
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页面，并在任何足够高的页面被释放之后2秒继续报告。
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报告的页面将被存储在传递给报告函数的散列表中，最后一个条目的结束位被设置在条目
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nent-1中。 当页面被报告函数处理时，分配器将无法访问它们。一旦报告函数完成，这些
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页将被返回到它们所获得的自由区域。
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在移除使用空闲页报告的驱动之前，有必要调用page_reporting_unregister，以移除
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目前被空闲页报告使用的page_reporting_dev_info结构体。这样做将阻止进一步的报
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告通过该接口发出。如果另一个驱动或同一驱动被注册，它就有可能恢复前一个驱动在报告
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空闲页方面的工作。
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Alexander Duyck, 2019年12月04日
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