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Subject[PATCH 12/23] thp, mm: add event counters for huge page alloc on file write or read
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

Existing stats specify source of thp page: fault or collapse. We're
going allocate a new huge page with write(2) and read(2). It's nither
fault nor collapse.

Let's introduce new events for that.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
Documentation/vm/transhuge.txt | 7 +++++++
include/linux/huge_mm.h | 5 +++++
include/linux/vm_event_item.h | 4 ++++
mm/vmstat.c | 4 ++++
4 files changed, 20 insertions(+)

diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
index 4cc15c4..a78f738 100644
--- a/Documentation/vm/transhuge.txt
+++ b/Documentation/vm/transhuge.txt
@@ -202,6 +202,10 @@ thp_collapse_alloc is incremented by khugepaged when it has found
a range of pages to collapse into one huge page and has
successfully allocated a new huge page to store the data.

+thp_write_alloc and thp_read_alloc are incremented every time a huge
+ page is successfully allocated to handle write(2) to a file or
+ read(2) from file.
+
thp_fault_fallback is incremented if a page fault fails to allocate
a huge page and instead falls back to using small pages.

@@ -209,6 +213,9 @@ thp_collapse_alloc_failed is incremented if khugepaged found a range
of pages that should be collapsed into one huge page but failed
the allocation.

+thp_write_alloc_failed and thp_read_alloc_failed are incremented if
+ huge page allocation failed when tried on write(2) or read(2).
+
thp_split is incremented every time a huge page is split into base
pages. This can happen for a variety of reasons but a common
reason is that a huge page is old and is being reclaimed.
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 4dc66c9..9a0a114 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -183,6 +183,11 @@ extern int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vm
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })

+#define THP_WRITE_ALLOC ({ BUILD_BUG(); 0; })
+#define THP_WRITE_ALLOC_FAILED ({ BUILD_BUG(); 0; })
+#define THP_READ_ALLOC ({ BUILD_BUG(); 0; })
+#define THP_READ_ALLOC_FAILED ({ BUILD_BUG(); 0; })
+
#define hpage_nr_pages(x) 1

#define transparent_hugepage_enabled(__vma) 0
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 1855f0a..8e071bb 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -66,6 +66,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
THP_FAULT_FALLBACK,
THP_COLLAPSE_ALLOC,
THP_COLLAPSE_ALLOC_FAILED,
+ THP_WRITE_ALLOC,
+ THP_WRITE_ALLOC_FAILED,
+ THP_READ_ALLOC,
+ THP_READ_ALLOC_FAILED,
THP_SPLIT,
THP_ZERO_PAGE_ALLOC,
THP_ZERO_PAGE_ALLOC_FAILED,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index ffe3fbd..a80ea59 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -815,6 +815,10 @@ const char * const vmstat_text[] = {
"thp_fault_fallback",
"thp_collapse_alloc",
"thp_collapse_alloc_failed",
+ "thp_write_alloc",
+ "thp_write_alloc_failed",
+ "thp_read_alloc",
+ "thp_read_alloc_failed",
"thp_split",
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",
--
1.8.3.2


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