The patch titled
Subject: thp, vmstats: count deferred split events
has been added to the -mm tree. Its filename is
thp-vmstats-count-deferred-split-events.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/thp-vmstats-count-deferred-split-events.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/thp-vmstats-count-deferred-split-events.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp, vmstats: count deferred split events
Counts how many times we put a THP in split queue. Currently, it happens
on partial unmap of a THP.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 1 +
mm/huge_memory.c | 1 +
mm/vmstat.c | 1 +
3 files changed, 3 insertions(+)
diff -puN include/linux/vm_event_item.h~thp-vmstats-count-deferred-split-events include/linux/vm_event_item.h
--- a/include/linux/vm_event_item.h~thp-vmstats-count-deferred-split-events
+++ a/include/linux/vm_event_item.h
@@ -72,6 +72,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
THP_COLLAPSE_ALLOC_FAILED,
THP_SPLIT_PAGE,
THP_SPLIT_PAGE_FAILED,
+ THP_DEFERRED_SPLIT_PAGE,
THP_SPLIT_PMD,
THP_ZERO_PAGE_ALLOC,
THP_ZERO_PAGE_ALLOC_FAILED,
diff -puN mm/huge_memory.c~thp-vmstats-count-deferred-split-events mm/huge_memory.c
--- a/mm/huge_memory.c~thp-vmstats-count-deferred-split-events
+++ a/mm/huge_memory.c
@@ -3452,6 +3452,7 @@ void deferred_split_huge_page(struct pag
spin_lock_irqsave(&pgdata->split_queue_lock, flags);
if (list_empty(page_deferred_list(page))) {
+ count_vm_event(THP_DEFERRED_SPLIT_PAGE);
list_add_tail(page_deferred_list(page), &pgdata->split_queue);
pgdata->split_queue_len++;
}
diff -puN mm/vmstat.c~thp-vmstats-count-deferred-split-events mm/vmstat.c
--- a/mm/vmstat.c~thp-vmstats-count-deferred-split-events
+++ a/mm/vmstat.c
@@ -848,6 +848,7 @@ const char * const vmstat_text[] = {
"thp_collapse_alloc_failed",
"thp_split_page",
"thp_split_page_failed",
+ "thp_deferred_split_page",
"thp_split_pmd",
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-dax-check-for-pmd_none-after-split_huge_pmd.patch
ipc-shm-handle-removed-segments-gracefully-in-shm_mmap.patch
thp-cleanup-split_huge_page.patch
thp-vmstats-count-deferred-split-events.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-2.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate-fix-3.patch
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