• C
    [PATCH] /proc/<pid>/numa_maps to show on which nodes pages reside · 6e21c8f1
    Christoph Lameter 提交于
    This patch was recently discussed on linux-mm:
    http://marc.theaimsgroup.com/?t=112085728500002&r=1&w=2
    
    I inherited a large code base from Ray for page migration.  There was a
    small patch in there that I find to be very useful since it allows the
    display of the locality of the pages in use by a process.  I reworked that
    patch and came up with a /proc/<pid>/numa_maps that gives more information
    about the vma's of a process.  numa_maps is indexes by the start address
    found in /proc/<pid>/maps.  F.e.  with this patch you can see the page use
    of the "getty" process:
    
    margin:/proc/12008 # cat maps
    00000000-00004000 r--p 00000000 00:00 0
    2000000000000000-200000000002c000 r-xp 00000000 08:04 516                /lib/ld-2.3.3.so
    2000000000038000-2000000000040000 rw-p 00028000 08:04 516                /lib/ld-2.3.3.so
    2000000000040000-2000000000044000 rw-p 2000000000040000 00:00 0
    2000000000058000-2000000000260000 r-xp 00000000 08:04 54707842           /lib/tls/libc.so.6.1
    2000000000260000-2000000000268000 ---p 00208000 08:04 54707842           /lib/tls/libc.so.6.1
    2000000000268000-2000000000274000 rw-p 00200000 08:04 54707842           /lib/tls/libc.so.6.1
    2000000000274000-2000000000280000 rw-p 2000000000274000 00:00 0
    2000000000280000-20000000002b4000 r--p 00000000 08:04 9126923            /usr/lib/locale/en_US.utf8/LC_CTYPE
    2000000000300000-2000000000308000 r--s 00000000 08:04 60071467           /usr/lib/gconv/gconv-modules.cache
    2000000000318000-2000000000328000 rw-p 2000000000318000 00:00 0
    4000000000000000-4000000000008000 r-xp 00000000 08:04 29576399           /sbin/mingetty
    6000000000004000-6000000000008000 rw-p 00004000 08:04 29576399           /sbin/mingetty
    6000000000008000-600000000002c000 rw-p 6000000000008000 00:00 0          [heap]
    60000fff7fffc000-60000fff80000000 rw-p 60000fff7fffc000 00:00 0
    60000ffffff44000-60000ffffff98000 rw-p 60000ffffff44000 00:00 0          [stack]
    a000000000000000-a000000000020000 ---p 00000000 00:00 0                  [vdso]
    
    cat numa_maps
    2000000000000000 default MaxRef=43 Pages=11 Mapped=11 N0=4 N1=3 N2=2 N3=2
    2000000000038000 default MaxRef=1 Pages=2 Mapped=2 Anon=2 N0=2
    2000000000040000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1
    2000000000058000 default MaxRef=43 Pages=61 Mapped=61 N0=14 N1=15 N2=16 N3=16
    2000000000268000 default MaxRef=1 Pages=2 Mapped=2 Anon=2 N0=2
    2000000000274000 default MaxRef=1 Pages=3 Mapped=3 Anon=3 N0=3
    2000000000280000 default MaxRef=8 Pages=3 Mapped=3 N0=3
    2000000000300000 default MaxRef=8 Pages=2 Mapped=2 N0=2
    2000000000318000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N2=1
    4000000000000000 default MaxRef=6 Pages=2 Mapped=2 N1=2
    6000000000004000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1
    6000000000008000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1
    60000fff7fffc000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1
    60000ffffff44000 default MaxRef=1 Pages=1 Mapped=1 Anon=1 N0=1
    
    getty uses ld.so.  The first vma is the code segment which is used by 43
    other processes and the pages are evenly distributed over the 4 nodes.
    
    The second vma is the process specific data portion for ld.so.  This is
    only one page.
    
    The display format is:
    
    <startaddress>	 Links to information in /proc/<pid>/map
    <memory policy>  This can be "default" "interleave={}", "prefer=<node>" or "bind={<zones>}"
    MaxRef=		<maximum reference to a page in this vma>
    Pages=		<Nr of pages in use>
    Mapped=		<Nr of pages with mapcount >
    Anon=		<nr of anonymous pages>
    Nx=		<Nr of pages on Node x>
    
    The content of the proc-file is self-evident.  If this would be tied into
    the sparsemem system then the contents of this file would not be too
    useful.
    Signed-off-by: NChristoph Lameter <clameter@sgi.com>
    Cc: Hugh Dickins <hugh@veritas.com>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    6e21c8f1
mempolicy.c 29.8 KB