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| author | Yang Shi <yang.shi@linux.alibaba.com> | 2019-04-19 04:17:04 +0800 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2019-04-19 12:48:06 -0600 |
| commit | a496696ab56917baf813dacb4f4837f1ef516c50 (patch) | |
| tree | 8a9ca097d381c297f668a51ebbd7247609c31d45 /Documentation/vm | |
| parent | d8e8bcc3d8de530da43de16bf9cd89aa553ae290 (diff) | |
doc: mm: migration doesn't use FOLL_SPLIT anymore
When demonstrating FOLL_SPLIT in transhuge document, migration is used
as an example. But, since commit 94723aafb9e7 ("mm: unclutter THP
migration"), the way of THP migration is totally changed. FOLL_SPLIT is
not used by migration anymore due to the change.
Remove the obsolete example to avoid confusion.
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/vm')
| -rw-r--r-- | Documentation/vm/transhuge.rst | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/Documentation/vm/transhuge.rst b/Documentation/vm/transhuge.rst index a8cf6809e36e..8df380657430 100644 --- a/Documentation/vm/transhuge.rst +++ b/Documentation/vm/transhuge.rst @@ -55,13 +55,7 @@ prevent page from being split by anyone. In case you can't handle compound pages if they're returned by follow_page, the FOLL_SPLIT bit can be specified as parameter to follow_page, so that it will split the hugepages before returning -them. Migration for example passes FOLL_SPLIT as parameter to -follow_page because it's not hugepage aware and in fact it can't work -at all on hugetlbfs (but it instead works fine on transparent -hugepages thanks to FOLL_SPLIT). migration simply can't deal with -hugepages being returned (as it's not only checking the pfn of the -page and pinning it during the copy but it pretends to migrate the -memory in regular page sizes and with regular pte/pmd mappings). +them. Graceful fallback ================= |