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@free.fr>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/trace/events/filemap.h b/include/trace/events/filemap.h
new file mode 100644 (file)
index 0000000..2d36386
--- /dev/null
+++ b/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 --git a/mm/filemap.c b/mm/filemap.c
index 24a7ea583f0cf4039525d824ac047f5f9d7eddb0..653f1d09488b631941a49f201a71aa86fb12b741 100644 (file)
--- a/mm/filemap.c
+++ b/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 page *page)
 {
        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 *page, struct address_space *mapping,
                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;