diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2015-04-06 05:36:09 (GMT) |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-04-13 14:44:52 (GMT) |
| commit | 9fdd8a875c6f3b02af48d5fa426206ca009b2b06 (patch) | |
| tree | 9a37cc4e8fc35c333bdfe35075bb3ba1b82bbf18 /include/trace/events/filemap.h | |
| parent | 066450be419fa48007a9f29e19828f2a86198754 (diff) | |
| download | linux-9fdd8a875c6f3b02af48d5fa426206ca009b2b06.tar.xz | |
tracing, mm: Record pfn instead of pointer to struct page
The struct page is opaque for userspace tools, so it'd be better to save
pfn in order to identify page frames.
The textual output of $debugfs/tracing/trace file remains unchanged and
only raw (binary) data format is changed - but thanks to libtraceevent,
userspace tools which deal with the raw data (like perf and trace-cmd)
can parse the format easily. So impact on the userspace will also be
minimal.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Based-on-patch-by: Joonsoo Kim <js1304@gmail.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1428298576-9785-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'include/trace/events/filemap.h')
| -rw-r--r-- | include/trace/events/filemap.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/trace/events/filemap.h b/include/trace/events/filemap.h index 0421f49..42febb6 100644 --- a/include/trace/events/filemap.h +++ b/include/trace/events/filemap.h @@ -18,14 +18,14 @@ DECLARE_EVENT_CLASS(mm_filemap_op_page_cache, TP_ARGS(page), TP_STRUCT__entry( - __field(struct page *, page) + __field(unsigned long, pfn) __field(unsigned long, i_ino) __field(unsigned long, index) __field(dev_t, s_dev) ), TP_fast_assign( - __entry->page = page; + __entry->pfn = page_to_pfn(page); __entry->i_ino = page->mapping->host->i_ino; __entry->index = page->index; if (page->mapping->host->i_sb) @@ -37,8 +37,8 @@ DECLARE_EVENT_CLASS(mm_filemap_op_page_cache, 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), + pfn_to_page(__entry->pfn), + __entry->pfn, __entry->index << PAGE_SHIFT) ); |