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https://github.com/torvalds/linux
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9fdd8a875c
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>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM filemap
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#if !defined(_TRACE_FILEMAP_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_FILEMAP_H
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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#include <linux/mm.h>
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#include <linux/memcontrol.h>
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#include <linux/device.h>
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#include <linux/kdev_t.h>
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DECLARE_EVENT_CLASS(mm_filemap_op_page_cache,
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TP_PROTO(struct page *page),
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TP_ARGS(page),
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TP_STRUCT__entry(
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__field(unsigned long, pfn)
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__field(unsigned long, i_ino)
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__field(unsigned long, index)
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__field(dev_t, s_dev)
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),
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TP_fast_assign(
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__entry->pfn = page_to_pfn(page);
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__entry->i_ino = page->mapping->host->i_ino;
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__entry->index = page->index;
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if (page->mapping->host->i_sb)
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__entry->s_dev = page->mapping->host->i_sb->s_dev;
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else
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__entry->s_dev = page->mapping->host->i_rdev;
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),
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TP_printk("dev %d:%d ino %lx page=%p pfn=%lu ofs=%lu",
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MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
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__entry->i_ino,
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pfn_to_page(__entry->pfn),
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__entry->pfn,
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__entry->index << PAGE_SHIFT)
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);
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DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_delete_from_page_cache,
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TP_PROTO(struct page *page),
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TP_ARGS(page)
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);
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DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_add_to_page_cache,
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TP_PROTO(struct page *page),
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TP_ARGS(page)
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);
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#endif /* _TRACE_FILEMAP_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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