[PATCH 12/23] thp, mm: add event counters for huge page alloc on file write or read
From: Kirill A. Shutemov <hidden>
Date: 2013-08-04 02:17:14
Also in:
linux-fsdevel, lkml
Subsystem:
documentation, memory management, memory management - core, memory management - thp (transparent huge page), the rest · Maintainers:
Jonathan Corbet, Andrew Morton, David Hildenbrand, Lorenzo Stoakes, Linus Torvalds
From: "Kirill A. Shutemov" <redacted> 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 <redacted> --- 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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