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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
#define PLUGIN_PROC_MODULE_KSM_NAME "/sys/kernel/mm/ksm"
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 unsigned long page_size = 0;
if(unlikely(page_size == 0))
page_size = (unsigned long)sysconf(_SC_PAGESIZE);
if(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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(unlikely(!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;
if(unlikely(!offered /*|| !pages_to_scan*/ && netdata_zero_metrics_enabled == CONFIG_BOOLEAN_NO)) return 0;
// --------------------------------------------------------------------
{
static RRDSET *st_mem_ksm = NULL;
static RRDDIM *rd_shared = NULL, *rd_unshared = NULL, *rd_sharing = NULL, *rd_volatile = NULL/*, *rd_to_scan = NULL*/;
if (unlikely(!st_mem_ksm)) {
st_mem_ksm = rrdset_create_localhost(
"mem"
, "ksm"
, NULL
, "ksm"
, NULL
, "Kernel Same Page Merging"
, "MiB"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_KSM_NAME
, NETDATA_CHART_PRIO_MEM_KSM
, update_every
, RRDSET_TYPE_STACKED
);
rd_shared = rrddim_add(st_mem_ksm, "shared", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rd_unshared = rrddim_add(st_mem_ksm, "unshared", NULL, -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rd_sharing = rrddim_add(st_mem_ksm, "sharing", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rd_volatile = rrddim_add(st_mem_ksm, "volatile", NULL, -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
//rd_to_scan = rrddim_add(st_mem_ksm, "to_scan", "to scan", -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
}
rrddim_set_by_pointer(st_mem_ksm, rd_shared, pages_shared * page_size);
rrddim_set_by_pointer(st_mem_ksm, rd_unshared, pages_unshared * page_size);
rrddim_set_by_pointer(st_mem_ksm, rd_sharing, pages_sharing * page_size);
rrddim_set_by_pointer(st_mem_ksm, rd_volatile, pages_volatile * page_size);
//rrddim_set_by_pointer(st_mem_ksm, rd_to_scan, pages_to_scan * page_size);
rrdset_done(st_mem_ksm);
}
// --------------------------------------------------------------------
{
static RRDSET *st_mem_ksm_savings = NULL;
static RRDDIM *rd_savings = NULL, *rd_offered = NULL;
if (unlikely(!st_mem_ksm_savings)) {
st_mem_ksm_savings = rrdset_create_localhost(
"mem"
, "ksm_savings"
, NULL
, "ksm"
, NULL
, "Kernel Same Page Merging Savings"
, "MiB"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_KSM_NAME
, NETDATA_CHART_PRIO_MEM_KSM_SAVINGS
, update_every
, RRDSET_TYPE_AREA
);
rd_savings = rrddim_add(st_mem_ksm_savings, "savings", NULL, -1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
rd_offered = rrddim_add(st_mem_ksm_savings, "offered", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
}
rrddim_set_by_pointer(st_mem_ksm_savings, rd_savings, saved * page_size);
rrddim_set_by_pointer(st_mem_ksm_savings, rd_offered, offered * page_size);
rrdset_done(st_mem_ksm_savings);
}
// --------------------------------------------------------------------
{
static RRDSET *st_mem_ksm_ratios = NULL;
static RRDDIM *rd_savings = NULL;
if (unlikely(!st_mem_ksm_ratios)) {
st_mem_ksm_ratios = rrdset_create_localhost(
"mem"
, "ksm_ratios"
, NULL
, "ksm"
, NULL
, "Kernel Same Page Merging Effectiveness"
, "percentage"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_KSM_NAME
, NETDATA_CHART_PRIO_MEM_KSM_RATIOS
, update_every
, RRDSET_TYPE_LINE
);
rd_savings = rrddim_add(st_mem_ksm_ratios, "savings", NULL, 1, 10000, RRD_ALGORITHM_ABSOLUTE);
}
rrddim_set_by_pointer(st_mem_ksm_ratios, rd_savings, offered ? (saved * 1000000) / offered : 0);
rrdset_done(st_mem_ksm_ratios);
}
return 0;
}
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