linux-kernel - [PATCH 0/3] perf report: Recognize hugetlb mapping as anon mapping

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Date:   Fri, 2 Sep 2016 13:59:44 +0000
From:   Wang Nan <wangnan0@...wei.com>
To:     <acme@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <lizefan@...wei.com>,
        Wang Nan <wangnan0@...wei.com>,
        Hou Pengyang <houpengyang@...wei.com>,
        He Kuang <hekuang@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 0/3] perf report: Recognize hugetlb mapping as anon mapping

The requirement of this function is first proposed at 2015.
Please refer to

http://lkml.iu.edu/hypermail/linux/kernel/1506.2/02372.html
http://lkml.iu.edu/hypermail/linux/kernel/1506.3/02290.html
http://lkml.iu.edu/hypermail/linux/kernel/1506.3/03512.html

For systems which use hugetlbfs, if a sample is captured inside
hugetlbfs, perf should not resolve symbols from the file shown in
/prof/<pid>/mmap, because 'files' in hugetlbfs are constructed
during execution and not ELF files. If user knows positions of
symbols, he/she should provide /tmp/perf-<pid>.map file.

This 3 patches makes perf recognize hugetlbfs mapping as anon mapping.
Before this 3 patches user has no chance to use his/her own .map file
to resolve symbols because perf tries to use hugetlbfs file.

Wang Nan (3):
  perf tools: Recognize hugetlb mapping as anon mapping
  tools lib api fs: Add hugetlbfs filesystem detector
  perf record: Mark MAP_HUGETLB during synthesizing mmap events

 tools/lib/api/fs/fs.c   | 15 +++++++++++++++
 tools/lib/api/fs/fs.h   |  1 +
 tools/perf/util/event.c |  7 +++++++
 tools/perf/util/map.c   |  8 +++++---
 4 files changed, 28 insertions(+), 3 deletions(-)

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Hou Pengyang <houpengyang@...wei.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
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