// 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; }