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    SubjectRe: [PATCH] vmallocinfo: Add NUMA informations
    On Wed, 04 Jun 2008 17:01:04 +0200 Eric Dumazet wrote:

    > Here is an updated patch.
    >
    > It now allocates the array in vmalloc_open().
    > If this allocation fails, we just proceed and dont provide NUMA information.
    >
    > I included missing documentation for /proc/vmallocinfo as well.
    >
    >
    > [PATCH] vmallocinfo: Add NUMA informations
    >
    > Christoph recently added /proc/vmallocinfo file to get information about vmalloc allocations.
    >
    > This patch adds NUMA specific information, giving number of pages allocated on each memory node.
    >
    > This should help to check that vmalloc() is able to respect NUMA policies.
    >
    > Example of output on a four nodes machine (one cpu per node)
    >
    > 1) network hash tables are evenly spreaded on four nodes (OK)
    > (Same point for inodes and dentries hash tables)
    > 2) iptables tables (x_tables) are correctly allocated on each cpu node (OK).
    > 3) sys_swapon() allocates its memory from one node only.
    > 4) each loaded module is using memory on one node.
    >
    > Sysadmins could tune their setup to change points 3) and 4) if necessary.
    >
    > grep "pages=" /proc/vmallocinfo
    > [snip]

    >
    > Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
    > ---
    > Documentation/filesystems/proc.txt | 44 +++++++++++++++++++++++++++
    > fs/proc/proc_misc.c | 15 +++++++--
    > mm/vmalloc.c | 20 ++++++++++++
    > 3 files changed, 77 insertions(+), 2 deletions(-)
    >
    > diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
    > index dbc3c6a..b707d9a 100644
    > --- a/Documentation/filesystems/proc.txt
    > +++ b/Documentation/filesystems/proc.txt
    > @@ -296,6 +296,7 @@ Table 1-4: Kernel info in /proc
    > uptime System uptime
    > version Kernel version
    > video bttv info of video resources (2.4)
    > + vmallocinfo Show vmalloced areas
    > ..............................................................................
    >
    > You can, for example, check which interrupts are currently in use and what
    > @@ -550,6 +551,49 @@ VmallocTotal: total size of vmalloc memory area
    > VmallocUsed: amount of vmalloc area which is used
    > VmallocChunk: largest contigious block of vmalloc area which is free
    >
    > +..............................................................................
    > +
    > +vmallocinfo:
    > +
    > +Provides information about vmalloced/vmaped areas. One line per area,
    > +containing the virtual address range of the area, size in bytes,
    > +caller information of the creator, and optional informations depending

    s/informations/information/

    > +on the kind of area :
    > +
    > + pages=nr number of pages
    > + phys=addr if a physical address was specified
    > + ioremap I/O mapping (ioremap() and friends)
    > + vmalloc vmalloc() area
    > + vmap vmap()ed pages
    > + user VM_USERMAP area
    > + vpages buffer for pages pointers was vmalloced (huge area)
    > + N<node>=nr (Only on NUMA kernels)
    > + Number of pages allocated on memory node <node>


    ---
    ~Randy


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