Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [PATCH 2/2] Report the pagesize backing a VMA in /proc/pid/maps | Date | Sat, 4 Oct 2008 17:14:50 +0900 (JST) |
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> 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) > b7daa000-b7dab000 rw-p b7daa000 00:00 0 > b7dab000-b7ed2000 r-xp 00000000 03:01 116846 /lib/tls/i686/cmov/libc-2.3.6.so > b7ed2000-b7ed7000 r--p 00127000 03:01 116846 /lib/tls/i686/cmov/libc-2.3.6.so > b7ed7000-b7ed9000 rw-p 0012c000 03:01 116846 /lib/tls/i686/cmov/libc-2.3.6.so > b7ed9000-b7edd000 rw-p b7ed9000 00:00 0 > b7ee1000-b7ee8000 r-xp 00000000 03:01 49262 /root/libhugetlbfs-git/obj32/libhugetlbfs.so > b7ee8000-b7ee9000 rw-p 00006000 03:01 49262 /root/libhugetlbfs-git/obj32/libhugetlbfs.so > b7ee9000-b7eed000 rw-p b7ee9000 00:00 0 > b7eed000-b7f02000 r-xp 00000000 03:01 119345 /lib/ld-2.3.6.so > b7f02000-b7f04000 rw-p 00014000 03:01 119345 /lib/ld-2.3.6.so > bf8ef000-bf903000 rwxp bffeb000 00:00 0 [stack] > bf903000-bf904000 rw-p bffff000 00:00 0 > ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso] > > 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). > > Signed-off-by: Mel Gorman <mel@csn.ul.ie> > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
This patch is nicer and cleaner than my version. Thanks! mel.
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