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  • Eric W. Biederman's avatar
    [PATCH] sysctl: reimplement the sysctl proc support · 77b14db5
    Eric W. Biederman authored
    
    
    With this change the sysctl inodes can be cached and nothing needs to be done
    when removing a sysctl table.
    
    For a cost of 2K code we will save about 4K of static tables (when we remove
    de from ctl_table) and 70K in proc_dir_entries that we will not allocate, or
    about half that on a 32bit arch.
    
    The speed feels about the same, even though we can now cache the sysctl
    dentries :(
    
    We get the core advantage that we don't need to have a 1 to 1 mapping between
    ctl table entries and proc files.  Making it possible to have /proc/sys vary
    depending on the namespace you are in.  The currently merged namespaces don't
    have an issue here but the network namespace under /proc/sys/net needs to have
    different directories depending on which network adapters are visible.  By
    simply being a cache different directories being visible depending on who you
    are is trivial to implement.
    
    [akpm@osdl.org: fix uninitialised var]
    [akpm@osdl.org: fix ARM build]
    [bunk@stusta.de: make things static]
    Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
    Cc: Russell King <rmk@arm.linux.org.uk>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    77b14db5