06-21-2016
Compared how? Why is it two, and not three, zero, or nine? Why is the result 27.47 and not 27.37 or 27.57? What criteria makes this decision?
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LEARN ABOUT CENTOS
avc_av_stats
avc_cache_stats(3) SELinux API documentation avc_cache_stats(3)
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)