The patch titled
Subject: mm: trace filemap add and del
has been added to the -mm tree. Its filename is
mm-trace-filemap-add-and-del.patch
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------------------------------------------------------
From: Robert Jarzmik <robert.jarzmik@xxxxxxx>
Subject: mm: trace filemap add and del
Use the events API to trace filemap loading and unloading of file pieces
into the page cache.
This patch aims at tracing the eviction reload cycle of executable and
shared libraries pages in a memory constrained environment.
The typical usage is to spot a specific device and inode (for example
/lib/libc.so) to see the eviction cycles, and find out if frequently used
code is rather spread across many pages (bad) or coallesced (good).
Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/trace/events/filemap.h | 79 +++++++++++++++++++++++++++++++
mm/filemap.c | 5 +
2 files changed, 84 insertions(+)
diff -puN /dev/null include/trace/events/filemap.h
--- /dev/null
+++ a/include/trace/events/filemap.h
@@ -0,0 +1,79 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM filemap
+
+#if !defined(_TRACE_FILEMAP_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_FILEMAP_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+#include <linux/mm.h>
+#include <linux/memcontrol.h>
+#include <linux/device.h>
+#include <linux/kdev_t.h>
+
+TRACE_EVENT(mm_filemap_delete_from_page_cache,
+
+ TP_PROTO(struct page *page),
+
+ TP_ARGS(page),
+
+ TP_STRUCT__entry(
+ __field(struct page *, page)
+ __field(unsigned long, i_ino)
+ __field(unsigned long, index)
+ __field(dev_t, s_dev)
+ ),
+
+ TP_fast_assign(
+ __entry->page = page;
+ __entry->i_ino = page->mapping->host->i_ino;
+ __entry->index = page->index;
+ if (page->mapping->host->i_sb)
+ __entry->s_dev = page->mapping->host->i_sb->s_dev;
+ else
+ __entry->s_dev = page->mapping->host->i_rdev;
+ ),
+
+ TP_printk("dev %d:%d ino %lx page=%p pfn=%lu ofs=%lu",
+ MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
+ __entry->i_ino,
+ __entry->page,
+ page_to_pfn(__entry->page),
+ __entry->index << PAGE_SHIFT)
+);
+
+TRACE_EVENT(mm_filemap_add_to_page_cache,
+
+ TP_PROTO(struct page *page),
+
+ TP_ARGS(page),
+
+ TP_STRUCT__entry(
+ __field(struct page *, page)
+ __field(unsigned long, i_ino)
+ __field(unsigned long, index)
+ __field(dev_t, s_dev)
+ ),
+
+ TP_fast_assign(
+ __entry->page = page;
+ __entry->i_ino = page->mapping->host->i_ino;
+ __entry->index = page->index;
+ if (page->mapping->host->i_sb)
+ __entry->s_dev = page->mapping->host->i_sb->s_dev;
+ else
+ __entry->s_dev = page->mapping->host->i_rdev;
+ ),
+
+ TP_printk("dev %d:%d ino %lx page=%p pfn=%lu ofs=%lu",
+ MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
+ __entry->i_ino,
+ __entry->page,
+ page_to_pfn(__entry->page),
+ __entry->index << PAGE_SHIFT)
+);
+
+#endif /* _TRACE_FILEMAP_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff -puN mm/filemap.c~mm-trace-filemap-add-and-del mm/filemap.c
--- a/mm/filemap.c~mm-trace-filemap-add-and-del
+++ a/mm/filemap.c
@@ -35,6 +35,9 @@
#include <linux/cleancache.h>
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/filemap.h>
+
/*
* FIXME: remove all knowledge of the buffer layer from the core VM
*/
@@ -113,6 +116,7 @@ void __delete_from_page_cache(struct pag
{
struct address_space *mapping = page->mapping;
+ trace_mm_filemap_delete_from_page_cache(page);
/*
* if we're uptodate, flush out into the cleancache, otherwise
* invalidate any existing cleancache entries. We can't leave
@@ -463,6 +467,7 @@ int add_to_page_cache_locked(struct page
if (likely(!error)) {
mapping->nrpages++;
__inc_zone_page_state(page, NR_FILE_PAGES);
+ trace_mm_filemap_add_to_page_cache(page);
spin_unlock_irq(&mapping->tree_lock);
} else {
page->mapping = NULL;
_
Patches currently in -mm which might be from robert.jarzmik@xxxxxxx are
origin.patch
linux-next.patch
mm-trace-filemap-add-and-del.patch
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