NAME

       avc_cache_stats, avc_av_stats, avc_sid_stats - obtain userspace SELinux AVC statistics

SYNOPSIS

       #include <selinux/selinux.h>
       #include <selinux/avc.h>

       void avc_av_stats(void);

       void avc_sid_stats(void);

       void avc_cache_stats(struct avc_cache_stats *stats);

DESCRIPTION

       The  userspace AVC maintains two internal hash tables, one to store security ID's and one to cache access
       decisions.

       avc_av_stats() and avc_sid_stats() produce log messages indicating the status of the access decision  and
       SID  tables,  respectively.   The  messages  contain  the  number of entries in the table, number of hash
       buckets and number of buckets used, and maximum number of entries in a single bucket.

       avc_cache_stats() populates a structure whose fields reflect cache activity:

              struct avc_cache_stats {
                  unsigned  entry_lookups;
                  unsigned  entry_hits;
                  unsigned  entry_misses;
                  unsigned  entry_discards;
                  unsigned  cav_lookups;
                  unsigned  cav_hits;
                  unsigned  cav_probes;
                  unsigned  cav_misses;
              };

       entry_lookups
              Number of queries made.

       entry_hits
              Number of times a decision was found in the aeref argument.

       entry_misses
              Number of times a decision was not found in the aeref argument.

       entry_discards
              Number of times a decision was not found in the aeref argument and the  aeref  argument  was  non-
              NULL.

       cav_lookups
              Number of cache lookups.

       cav_hits
              Number of cache hits.

       cav_misses
              Number of cache misses.

       cav_probes
              Number of entries examined while searching the cache.

NOTES

       When  the  cache  is  flushed  as  a result of a call to avc_reset() or a policy change notification, the
       statistics returned by avc_cache_stats() are reset to zero.  The SID table, however, is left unchanged.

       When a policy change notification is received, a call to avc_av_stats()  is  made  before  the  cache  is
       flushed.

AUTHOR

       Eamon Walsh <ewalsh@tycho.nsa.gov>

SEE ALSO

       avc_init(3), avc_has_perm(3), avc_context_to_sid(3), avc_add_callback(3), selinux(8)

                                                   27 May 2004                                avc_cache_stats(3)