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    SubjectRe: [PATCH 2/2] Report the pagesize backing a VMA in /proc/pid/maps

    >> This patch adds a new field for hugepage-backed memory regions to show the
    >> pagesize in /proc/pid/maps. While the information is available in smaps,
    >> maps is more human-readable and does not incur the cost of calculating Pss. An
    >> example of a /proc/self/maps output for an application using hugepages with
    >> this patch applied is;
    >> 08048000-0804c000 r-xp 00000000 03:01 49135 /bin/cat
    >> 0804c000-0804d000 rw-p 00003000 03:01 49135 /bin/cat
    >> 08400000-08800000 rw-p 00000000 00:10 4055 /mnt/libhugetlbfs.tmp.QzPPTJ (deleted) (hpagesize=4096kB)
    >> To be predictable for parsers, the patch adds the notion of reporting on VMA
    >> attributes by appending one or more fields that look like "(attribute)". This
    >> already happens when a file is deleted and the user sees (deleted) after the
    >> filename. The expectation is that existing parsers will not break as those
    >> that read the filename should be reading forward after the inode number
    >> and stopping when it sees something that is not part of the filename.
    >> Parsers that assume everything after / is a filename will get confused by
    >> (hpagesize=XkB) but are already broken due to (deleted).
    > Looks like procps will start showing hpagesize tag as a mapping name
    > (apologies for pasting crappy code):

    Administrator expect mapping name is just file name when vma is
    hugepage via mmap.
    So, I feel Mel's code is nicer.


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      Last update: 2008-10-05 08:03    [W:0.020 / U:20.644 seconds]
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