avc_cache_stats - Online Linux Manual PageSection : 3
Updated : 27 May 2004
Source :
Note : SELinux API documentation
NAMEavc_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);
DESCRIPTIONThe 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;
};.ta 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.
NOTESWhen 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.
AUTHOREamon Walsh <ewalsh@tycho.nsa.gov>
SEE ALSOavc_init(3), avc_has_perm(3), avc_context_to_sid(3), avc_add_callback(3), selinux(8) 0
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