avc_cache_stats(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | NOTES | AUTHOR | SEE ALSO | COLOPHON

avc_cache_stats(3)      SELinux API documentation     avc_cache_stats(3)

NAME         top

       avc_cache_stats, avc_av_stats, avc_sid_stats - obtain userspace
       SELinux AVC statistics

SYNOPSIS         top

       #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         top

       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         top

       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         top

       Eamon Walsh <ewalsh@tycho.nsa.gov>

SEE ALSO         top

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

COLOPHON         top

       This page is part of the selinux (Security-Enhanced Linux user-
       space libraries and tools) project.  Information about the
       project can be found at 
       ⟨https://github.com/SELinuxProject/selinux/wiki⟩.  If you have a
       bug report for this manual page, see
       ⟨https://github.com/SELinuxProject/selinux/wiki/Contributing⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/SELinuxProject/selinux⟩ on 2021-06-20.  (At
       that time, the date of the most recent commit that was found in
       the repository was 2021-06-18.)  If you discover any rendering
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       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

                               27 May 2004            avc_cache_stats(3)

Pages that refer to this page: avc_add_callback(3)avc_context_to_sid(3)avc_has_perm(3)avc_open(3)