diff options
| author | Usama Arif <[email protected]> | 2024-08-30 11:03:39 +0100 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2024-09-09 16:39:04 -0700 |
| commit | dafff3f4c850c98e15501bc6ee20581f9a013dcc (patch) | |
| tree | 1b28424445a2a5e528a0a2f8640ddf637eb67328 /include/linux | |
| parent | 8422acdc97ed5839692b45f800dbfb78abe65a94 (diff) | |
mm: split underused THPs
This is an attempt to mitigate the issue of running out of memory when THP
is always enabled. During runtime whenever a THP is being faulted in
(__do_huge_pmd_anonymous_page) or collapsed by khugepaged
(collapse_huge_page), the THP is added to _deferred_list. Whenever memory
reclaim happens in linux, the kernel runs the deferred_split shrinker
which goes through the _deferred_list.
If the folio was partially mapped, the shrinker attempts to split it. If
the folio is not partially mapped, the shrinker checks if the THP was
underused, i.e. how many of the base 4K pages of the entire THP were
zero-filled. If this number goes above a certain threshold (decided by
/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none), the
shrinker will attempt to split that THP. Then at remap time, the pages
that were zero-filled are mapped to the shared zeropage, hence saving
memory.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Usama Arif <[email protected]>
Suggested-by: Rik van Riel <[email protected]>
Co-authored-by: Johannes Weiner <[email protected]>
Cc: Alexander Zhu <[email protected]>
Cc: Barry Song <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Domenico Cerasuolo <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kairui Song <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Nico Pache <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Shuang Zhai <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Shuang Zhai <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/khugepaged.h | 1 | ||||
| -rw-r--r-- | include/linux/vm_event_item.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h index f68865e19b0b..30baae91b225 100644 --- a/include/linux/khugepaged.h +++ b/include/linux/khugepaged.h @@ -4,6 +4,7 @@ #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */ +extern unsigned int khugepaged_max_ptes_none __read_mostly; #ifdef CONFIG_TRANSPARENT_HUGEPAGE extern struct attribute_group khugepaged_attr_group; diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h index aae5c7c5cfb4..aed952d04132 100644 --- a/include/linux/vm_event_item.h +++ b/include/linux/vm_event_item.h @@ -105,6 +105,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, THP_SPLIT_PAGE, THP_SPLIT_PAGE_FAILED, THP_DEFERRED_SPLIT_PAGE, + THP_UNDERUSED_SPLIT_PAGE, THP_SPLIT_PMD, THP_SCAN_EXCEED_NONE_PTE, THP_SCAN_EXCEED_SWAP_PTE, |