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#include "common.h"
typedef struct ksm_name_value {
char filename[FILENAME_MAX + 1];
unsigned long long value;
} KSM_NAME_VALUE;
#define PAGES_SHARED 0
#define PAGES_SHARING 1
#define PAGES_UNSHARED 2
#define PAGES_VOLATILE 3
#define PAGES_TO_SCAN 4
KSM_NAME_VALUE values[] = {
[PAGES_SHARED] = { "/sys/kernel/mm/ksm/pages_shared", 0ULL },
[PAGES_SHARING] = { "/sys/kernel/mm/ksm/pages_sharing", 0ULL },
[PAGES_UNSHARED] = { "/sys/kernel/mm/ksm/pages_unshared", 0ULL },
[PAGES_VOLATILE] = { "/sys/kernel/mm/ksm/pages_volatile", 0ULL },
[PAGES_TO_SCAN] = { "/sys/kernel/mm/ksm/pages_to_scan", 0ULL },
};
int do_sys_kernel_mm_ksm(int update_every, usec_t dt) {
(void)dt;
static procfile *ff_pages_shared = NULL, *ff_pages_sharing = NULL, *ff_pages_unshared = NULL, *ff_pages_volatile = NULL, *ff_pages_to_scan = NULL;
static long page_size = -1;
if(page_size == -1)
page_size = sysconf(_SC_PAGESIZE);
if(!ff_pages_shared) {
snprintfz(values[PAGES_SHARED].filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/kernel/mm/ksm/pages_shared");
snprintfz(values[PAGES_SHARED].filename, FILENAME_MAX, "%s", config_get("plugin:proc:/sys/kernel/mm/ksm", "/sys/kernel/mm/ksm/pages_shared", values[PAGES_SHARED].filename));
ff_pages_shared = procfile_open(values[PAGES_SHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
}
if(!ff_pages_sharing) {
snprintfz(values[PAGES_SHARING].filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/kernel/mm/ksm/pages_sharing");
snprintfz(values[PAGES_SHARING].filename, FILENAME_MAX, "%s", config_get("plugin:proc:/sys/kernel/mm/ksm", "/sys/kernel/mm/ksm/pages_sharing", values[PAGES_SHARING].filename));
ff_pages_sharing = procfile_open(values[PAGES_SHARING].filename, " \t:", PROCFILE_FLAG_DEFAULT);
}
if(!ff_pages_unshared) {
snprintfz(values[PAGES_UNSHARED].filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/kernel/mm/ksm/pages_unshared");
snprintfz(values[PAGES_UNSHARED].filename, FILENAME_MAX, "%s", config_get("plugin:proc:/sys/kernel/mm/ksm", "/sys/kernel/mm/ksm/pages_unshared", values[PAGES_UNSHARED].filename));
ff_pages_unshared = procfile_open(values[PAGES_UNSHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
}
if(!ff_pages_volatile) {
snprintfz(values[PAGES_VOLATILE].filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/kernel/mm/ksm/pages_volatile");
snprintfz(values[PAGES_VOLATILE].filename, FILENAME_MAX, "%s", config_get("plugin:proc:/sys/kernel/mm/ksm", "/sys/kernel/mm/ksm/pages_volatile", values[PAGES_VOLATILE].filename));
ff_pages_volatile = procfile_open(values[PAGES_VOLATILE].filename, " \t:", PROCFILE_FLAG_DEFAULT);
}
if(!ff_pages_to_scan) {
snprintfz(values[PAGES_TO_SCAN].filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/kernel/mm/ksm/pages_to_scan");
snprintfz(values[PAGES_TO_SCAN].filename, FILENAME_MAX, "%s", config_get("plugin:proc:/sys/kernel/mm/ksm", "/sys/kernel/mm/ksm/pages_to_scan", values[PAGES_TO_SCAN].filename));
ff_pages_to_scan = procfile_open(values[PAGES_TO_SCAN].filename, " \t:", PROCFILE_FLAG_DEFAULT);
}
if(!ff_pages_shared || !ff_pages_sharing || !ff_pages_unshared || !ff_pages_volatile || !ff_pages_to_scan) return 1;
unsigned long long pages_shared = 0, pages_sharing = 0, pages_unshared = 0, pages_volatile = 0, pages_to_scan = 0, offered = 0, saved = 0;
ff_pages_shared = procfile_readall(ff_pages_shared);
if(!ff_pages_shared) return 0; // we return 0, so that we will retry to open it next time
pages_shared = str2ull(procfile_lineword(ff_pages_shared, 0, 0));
ff_pages_sharing = procfile_readall(ff_pages_sharing);
if(!ff_pages_sharing) return 0; // we return 0, so that we will retry to open it next time
pages_sharing = str2ull(procfile_lineword(ff_pages_sharing, 0, 0));
ff_pages_unshared = procfile_readall(ff_pages_unshared);
if(!ff_pages_unshared) return 0; // we return 0, so that we will retry to open it next time
pages_unshared = str2ull(procfile_lineword(ff_pages_unshared, 0, 0));
ff_pages_volatile = procfile_readall(ff_pages_volatile);
if(!ff_pages_volatile) return 0; // we return 0, so that we will retry to open it next time
pages_volatile = str2ull(procfile_lineword(ff_pages_volatile, 0, 0));
ff_pages_to_scan = procfile_readall(ff_pages_to_scan);
if(!ff_pages_to_scan) return 0; // we return 0, so that we will retry to open it next time
pages_to_scan = str2ull(procfile_lineword(ff_pages_to_scan, 0, 0));
offered = pages_sharing + pages_shared + pages_unshared + pages_volatile;
saved = pages_sharing - pages_shared;
if(!offered || !pages_to_scan) return 0;
RRDSET *st;
// --------------------------------------------------------------------
st = rrdset_find_localhost("mem.ksm");
if(!st) {
st = rrdset_create_localhost("mem", "ksm", NULL, "ksm", NULL, "Kernel Same Page Merging", "MB", 5000
, update_every, RRDSET_TYPE_AREA);
rrddim_add(st, "shared", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(st, "unshared", NULL, -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(st, "sharing", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(st, "volatile", NULL, -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(st, "to_scan", "to scan", -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
}
else rrdset_next(st);
rrddim_set(st, "shared", pages_shared * page_size);
rrddim_set(st, "unshared", pages_unshared * page_size);
rrddim_set(st, "sharing", pages_sharing * page_size);
rrddim_set(st, "volatile", pages_volatile * page_size);
rrddim_set(st, "to_scan", pages_to_scan * page_size);
rrdset_done(st);
st = rrdset_find_localhost("mem.ksm_savings");
if(!st) {
st = rrdset_create_localhost("mem", "ksm_savings", NULL, "ksm", NULL, "Kernel Same Page Merging Savings", "MB"
, 5001, update_every, RRDSET_TYPE_AREA);
rrddim_add(st, "savings", NULL, -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(st, "offered", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
}
else rrdset_next(st);
rrddim_set(st, "savings", saved * page_size);
rrddim_set(st, "offered", offered * page_size);
rrdset_done(st);
st = rrdset_find_localhost("mem.ksm_ratios");
if(!st) {
st = rrdset_create_localhost("mem", "ksm_ratios", NULL, "ksm", NULL, "Kernel Same Page Merging Effectiveness"
, "percentage", 5002, update_every, RRDSET_TYPE_LINE);
rrddim_add(st, "savings", NULL, 1, 10000, RRD_ALGORITHM_ABSOLUTE);
}
else rrdset_next(st);
rrddim_set(st, "savings", (saved * 1000000) / offered);
rrdset_done(st);
return 0;
}
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