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| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2024-08-26 08:58:13 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-10 01:38:59 +0200 |
| commit | 775d28fd45a2f5e58d8927ce77693398b1f074a6 (patch) | |
| tree | ac274b27ba2ff9b5125ab3eee1201d320d3c3e49 /Documentation/mm | |
| parent | mm: migrate_device: use more folio in migrate_device_finalize() (diff) | |
| download | linux-775d28fd45a2f5e58d8927ce77693398b1f074a6.tar.xz linux-775d28fd45a2f5e58d8927ce77693398b1f074a6.zip | |
mm: remove isolate_lru_page()
There are no more callers of isolate_lru_page(), remove it.
[wangkefeng.wang@huawei.com: convert page to folio in comment and document, per Matthew]
Link: https://lkml.kernel.org/r/20240826144114.1928071-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20240826065814.1336616-6-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/mm')
| -rw-r--r-- | Documentation/mm/page_migration.rst | 22 | ||||
| -rw-r--r-- | Documentation/mm/unevictable-lru.rst | 4 |
2 files changed, 13 insertions, 13 deletions
diff --git a/Documentation/mm/page_migration.rst b/Documentation/mm/page_migration.rst index f1ce67a26615..519b35a4caf5 100644 --- a/Documentation/mm/page_migration.rst +++ b/Documentation/mm/page_migration.rst @@ -63,15 +63,15 @@ and then a low level description of how the low level details work. In kernel use of migrate_pages() ================================ -1. Remove pages from the LRU. +1. Remove folios from the LRU. - Lists of pages to be migrated are generated by scanning over - pages and moving them into lists. This is done by - calling isolate_lru_page(). - Calling isolate_lru_page() increases the references to the page - so that it cannot vanish while the page migration occurs. + Lists of folios to be migrated are generated by scanning over + folios and moving them into lists. This is done by + calling folio_isolate_lru(). + Calling folio_isolate_lru() increases the references to the folio + so that it cannot vanish while the folio migration occurs. It also prevents the swapper or other scans from encountering - the page. + the folio. 2. We need to have a function of type new_folio_t that can be passed to migrate_pages(). This function should figure out @@ -84,10 +84,10 @@ In kernel use of migrate_pages() How migrate_pages() works ========================= -migrate_pages() does several passes over its list of pages. A page is moved -if all references to a page are removable at the time. The page has -already been removed from the LRU via isolate_lru_page() and the refcount -is increased so that the page cannot be freed while page migration occurs. +migrate_pages() does several passes over its list of folios. A folio is moved +if all references to a folio are removable at the time. The folio has +already been removed from the LRU via folio_isolate_lru() and the refcount +is increased so that the folio cannot be freed while folio migration occurs. Steps: diff --git a/Documentation/mm/unevictable-lru.rst b/Documentation/mm/unevictable-lru.rst index 255ef12a432b..8d11fe6a0854 100644 --- a/Documentation/mm/unevictable-lru.rst +++ b/Documentation/mm/unevictable-lru.rst @@ -80,7 +80,7 @@ on an additional LRU list for a few reasons: (2) We want to be able to migrate unevictable folios between nodes for memory defragmentation, workload management and memory hotplug. The Linux kernel can only migrate folios that it can successfully isolate from the LRU - lists (or "Movable" pages: outside of consideration here). If we were to + lists (or "Movable" folios: outside of consideration here). If we were to maintain folios elsewhere than on an LRU-like list, where they can be detected by folio_isolate_lru(), we would prevent their migration. @@ -230,7 +230,7 @@ In Nick's patch, he used one of the struct page LRU list link fields as a count of VM_LOCKED VMAs that map the page (Rik van Riel had the same idea three years earlier). But this use of the link field for a count prevented the management of the pages on an LRU list, and thus mlocked pages were not migratable as -isolate_lru_page() could not detect them, and the LRU list link field was not +folio_isolate_lru() could not detect them, and the LRU list link field was not available to the migration subsystem. Nick resolved this by putting mlocked pages back on the LRU list before |