linux-kernel - [PATCHv4 18/39] thp, mm: add event counters for huge page alloc on write to a file

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Date:	Sun, 12 May 2013 04:23:15 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>, Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv4 18/39] thp, mm: add event counters for huge page alloc on write to a file

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

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

Let's introduce new events for that.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 include/linux/vm_event_item.h |    2 ++
 mm/vmstat.c                   |    2 ++
 2 files changed, 4 insertions(+)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index d4b7a18..584c71c 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -71,6 +71,8 @@ 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_SPLIT,
 		THP_ZERO_PAGE_ALLOC,
 		THP_ZERO_PAGE_ALLOC_FAILED,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 7945285..df8dcda 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -821,6 +821,8 @@ const char * const vmstat_text[] = {
 	"thp_fault_fallback",
 	"thp_collapse_alloc",
 	"thp_collapse_alloc_failed",
+	"thp_write_alloc",
+	"thp_write_alloc_failed",
 	"thp_split",
 	"thp_zero_page_alloc",
 	"thp_zero_page_alloc_failed",
-- 
1.7.10.4

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