• Christoph Hellwig's avatar
    [PATCH] buffermem_pages removal (1/5) · e95bd965
    Christoph Hellwig authored
    With all work done by akpm in 2.5 Linus no more has a buffer cache
    in the traditional sense.  Still we try to keep estimates about
    what would be the buffer cache size by keeping the number of pages
    indexed by block device inodes.  This is broken not only because the
    old buffercache was also used for file data which is nowdays not
    hashed to block device inodes and thus makes every user of this data
    assume wrong numbers.  Second is is possible to use block device
    pages not through the buffer_head interface (i.e. userspace
    block device nodes, possibly JFS also soon).  In addition the atomic_t
    used for this bookkepping (buffermem_pages) causes cacheline bouncing
    on larger machines.
    
    This is the first patch of a series to get rid of it.  It removes the
    useless output of supposedly buffer pages in show_mem(), which is used
    by the magic sysrq key code.
    e95bd965
numa.c 11.9 KB