• Eric Paris's avatar
    selinux: cache sidtab_context_to_sid results · 73ff5fc0
    Eric Paris authored
    sidtab_context_to_sid takes up a large share of time when creating large
    numbers of new inodes (~30-40% in oprofile runs).  This patch implements a
    cache of 3 entries which is checked before we do a full context_to_sid lookup.
    On one system this showed over a x3 improvement in the number of inodes that
    could be created per second and around a 20% improvement on another system.
    
    Any time we look up the same context string sucessivly (imagine ls -lZ) we
    should hit this cache hot.  A cache miss should have a relatively minor affect
    on performance next to doing the full table search.
    
    All operations on the cache are done COMPLETELY lockless.  We know that all
    struct sidtab_node objects created will never be deleted until a new policy is
    loaded thus we never have to worry about a pointer being dereferenced.  Since
    we also know that pointer assignment is atomic we know that the cache will
    always have valid pointers.  Given this information we implement a FIFO cache
    in an array of 3 pointers.  Every result (whether a cache hit or table lookup)
    will be places in the 0 spot of the cache and the rest of the entries moved
    down one spot.  The 3rd entry will be lost.
    
    Races are possible and are even likely to happen.  Lets assume that 4 tasks
    are hitting sidtab_context_to_sid.  The first task checks against the first
    entry in the cache and it is a miss.  Now lets assume a second task updates
    the cache with a new entry.  This will push the first entry back to the second
    spot.  Now the first task might check against the second entry (which it
    already checked) and will miss again.  Now say some third task updates the
    cache and push the second entry to the third spot.  The first task my check
    the third entry (for the third time!) and again have a miss.  At which point
    it will just do a full table lookup.  No big deal!
    Signed-off-by: default avatarEric Paris <eparis@redhat.com>
    73ff5fc0
sidtab.c 5.87 KB