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authorBaolin Wang <baolin.wang@linux.alibaba.com>2022-01-15 01:08:37 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-15 17:30:30 +0300
commit5d39a7ebc8be70e30176aed6f98f799bfa7439d6 (patch)
tree922d6fb22d9ecce0aacb6c629bb4041e021c49e2 /Documentation
parentb5bade978e9b8f42521ccef711642bd21313cf44 (diff)
downloadlinux-5d39a7ebc8be70e30176aed6f98f799bfa7439d6.tar.xz
mm: migrate: correct the hugetlb migration stats
Correct the migration stats for hugetlb with using compound_nr() instead of thp_nr_pages(), meanwhile change 'nr_failed_pages' to record the number of normal pages failed to migrate, including THP and hugetlb, and 'nr_succeeded' will record the number of normal pages migrated successfully. [baolin.wang@linux.alibaba.com: fix docs, per Mike] Link: https://lkml.kernel.org/r/141bdfc6-f898-3cc3-f692-726c5f6cb74d@linux.alibaba.com Link: https://lkml.kernel.org/r/71a4b6c22f208728fe8c78ad26375436c4ff9704.1636275127.git.baolin.wang@linux.alibaba.com Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Reviewed-by: Zi Yan <ziy@nvidia.com> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/vm/page_migration.rst12
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/vm/page_migration.rst b/Documentation/vm/page_migration.rst
index 08810f549f70..8c5cb8147e55 100644
--- a/Documentation/vm/page_migration.rst
+++ b/Documentation/vm/page_migration.rst
@@ -263,15 +263,15 @@ Monitoring Migration
The following events (counters) can be used to monitor page migration.
1. PGMIGRATE_SUCCESS: Normal page migration success. Each count means that a
- page was migrated. If the page was a non-THP page, then this counter is
- increased by one. If the page was a THP, then this counter is increased by
- the number of THP subpages. For example, migration of a single 2MB THP that
- has 4KB-size base pages (subpages) will cause this counter to increase by
- 512.
+ page was migrated. If the page was a non-THP and non-hugetlb page, then
+ this counter is increased by one. If the page was a THP or hugetlb, then
+ this counter is increased by the number of THP or hugetlb subpages.
+ For example, migration of a single 2MB THP that has 4KB-size base pages
+ (subpages) will cause this counter to increase by 512.
2. PGMIGRATE_FAIL: Normal page migration failure. Same counting rules as for
PGMIGRATE_SUCCESS, above: this will be increased by the number of subpages,
- if it was a THP.
+ if it was a THP or hugetlb.
3. THP_MIGRATION_SUCCESS: A THP was migrated without being split.