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4223. [func] Add support for setting max-cache-size to percentage

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of available physical memory, set default to 90%.
			[RT #38442]
This commit is contained in:
Witold Krecicki
2015-09-28 11:08:50 +02:00
parent 98a7f8c7ae
commit e6d0a391f5
20 changed files with 396 additions and 29 deletions
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29
bin/named/server.c
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@@ -37,6 +37,7 @@
#include <isc/hmacsha.h>
#include <isc/httpd.h>
#include <isc/lex.h>
#include <isc/meminfo.h>
#include <isc/parseint.h>
#include <isc/portset.h>
#include <isc/print.h>
@@ -131,6 +132,10 @@
#define SIZE_MAX ((size_t)-1)
#endif
#ifndef SIZE_AS_PERCENT
#define SIZE_AS_PERCENT ((size_t)-2)
#endif
#ifdef TUNE_LARGE
#define RESOLVER_NTASKS 523
#define UDPBUFFERS 32768
@@ -2400,6 +2405,7 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
isc_result_t result;
unsigned int cleaning_interval;
size_t max_cache_size;
isc_uint32_t max_cache_size_percent = 0;
size_t max_acache_size;
size_t max_adb_size;
isc_uint32_t lame_ttl, fail_ttl;
@@ -2685,6 +2691,9 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
str = cfg_obj_asstring(obj);
INSIST(strcasecmp(str, "unlimited") == 0);
max_cache_size = 0;
} else if (cfg_obj_ispercentage(obj)) {
max_cache_size = SIZE_AS_PERCENT;
max_cache_size_percent = cfg_obj_aspercentage(obj);
} else {
isc_resourcevalue_t value;
value = cfg_obj_asuint64(obj);
@@ -2701,6 +2710,26 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
max_cache_size = (size_t) value;
}
if (max_cache_size == SIZE_AS_PERCENT) {
isc_uint64_t totalphys = isc_meminfo_totalphys();
max_cache_size = totalphys * max_cache_size_percent/100;
if (totalphys == 0) {
cfg_obj_log(obj, ns_g_lctx,
ISC_LOG_WARNING,
"Unable to determine amount of physical "
"memory, setting 'max-cache-size' to "
"unlimited");
} else {
cfg_obj_log(obj, ns_g_lctx,
ISC_LOG_INFO,
"'max-cache-size %d%%' "
"- setting to %luMB (out of %luMB)",
max_cache_size_percent,
max_cache_size / (1024*1024),
(unsigned long) totalphys / (1024*1024));
}
}
/* Check-names. */
obj = NULL;
result = ns_checknames_get(maps, "response", &obj);