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

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Date:   Sat, 3 Sep 2016 10:59:32 -0500
From:   Nilay Vaish <nilayvaish@...il.com>
To:     Wang Nan <wangnan0@...wei.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        lizefan@...wei.com, Hou Pengyang <houpengyang@...wei.com>,
        He Kuang <hekuang@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 0/3] perf report: Recognize hugetlb mapping as anon mapping

On 2 September 2016 at 08:59, Wang Nan <wangnan0@...wei.com> wrote:
> 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>


Reviewed-by: Nilay Vaish <nilayvaish@...il.com>