10 #include "appconfig.h"
13 #include "plugin_proc.h"
15 typedef struct name_value {
16 char filename[FILENAME_MAX + 1];
17 unsigned long long value;
20 #define PAGES_SHARED 0
21 #define PAGES_SHARING 1
22 #define PAGES_UNSHARED 2
23 #define PAGES_VOLATILE 3
24 #define PAGES_TO_SCAN 4
26 NAME_VALUE values[] = {
27 [PAGES_SHARED] = { "/sys/kernel/mm/ksm/pages_shared", 0ULL },
28 [PAGES_SHARING] = { "/sys/kernel/mm/ksm/pages_sharing", 0ULL },
29 [PAGES_UNSHARED] = { "/sys/kernel/mm/ksm/pages_unshared", 0ULL },
30 [PAGES_VOLATILE] = { "/sys/kernel/mm/ksm/pages_volatile", 0ULL },
31 [PAGES_TO_SCAN] = { "/sys/kernel/mm/ksm/pages_to_scan", 0ULL },
34 int do_sys_kernel_mm_ksm(int update_every, unsigned long long dt) {
35 static procfile *ff_pages_shared = NULL, *ff_pages_sharing = NULL, *ff_pages_unshared = NULL, *ff_pages_volatile = NULL, *ff_pages_to_scan = NULL;
36 static long page_size = -1;
41 page_size = sysconf(_SC_PAGESIZE);
43 if(!ff_pages_shared) {
44 snprintf(values[PAGES_SHARED].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_shared");
45 snprintf(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));
46 ff_pages_shared = procfile_open(values[PAGES_SHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
49 if(!ff_pages_sharing) {
50 snprintf(values[PAGES_SHARING].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_sharing");
51 snprintf(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));
52 ff_pages_sharing = procfile_open(values[PAGES_SHARING].filename, " \t:", PROCFILE_FLAG_DEFAULT);
55 if(!ff_pages_unshared) {
56 snprintf(values[PAGES_UNSHARED].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_unshared");
57 snprintf(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));
58 ff_pages_unshared = procfile_open(values[PAGES_UNSHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
61 if(!ff_pages_volatile) {
62 snprintf(values[PAGES_VOLATILE].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_volatile");
63 snprintf(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));
64 ff_pages_volatile = procfile_open(values[PAGES_VOLATILE].filename, " \t:", PROCFILE_FLAG_DEFAULT);
67 if(!ff_pages_to_scan) {
68 snprintf(values[PAGES_TO_SCAN].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_to_scan");
69 snprintf(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));
70 ff_pages_to_scan = procfile_open(values[PAGES_TO_SCAN].filename, " \t:", PROCFILE_FLAG_DEFAULT);
73 if(!ff_pages_shared || !ff_pages_sharing || !ff_pages_unshared || !ff_pages_volatile || !ff_pages_to_scan) return 1;
75 unsigned long long pages_shared = 0, pages_sharing = 0, pages_unshared = 0, pages_volatile = 0, pages_to_scan = 0, offered = 0, saved = 0;
77 ff_pages_shared = procfile_readall(ff_pages_shared);
78 if(!ff_pages_shared) return 0; // we return 0, so that we will retry to open it next time
79 pages_shared = strtoull(procfile_lineword(ff_pages_shared, 0, 0), NULL, 10);
81 ff_pages_sharing = procfile_readall(ff_pages_sharing);
82 if(!ff_pages_sharing) return 0; // we return 0, so that we will retry to open it next time
83 pages_sharing = strtoull(procfile_lineword(ff_pages_sharing, 0, 0), NULL, 10);
85 ff_pages_unshared = procfile_readall(ff_pages_unshared);
86 if(!ff_pages_unshared) return 0; // we return 0, so that we will retry to open it next time
87 pages_unshared = strtoull(procfile_lineword(ff_pages_unshared, 0, 0), NULL, 10);
89 ff_pages_volatile = procfile_readall(ff_pages_volatile);
90 if(!ff_pages_volatile) return 0; // we return 0, so that we will retry to open it next time
91 pages_volatile = strtoull(procfile_lineword(ff_pages_volatile, 0, 0), NULL, 10);
93 ff_pages_to_scan = procfile_readall(ff_pages_to_scan);
94 if(!ff_pages_to_scan) return 0; // we return 0, so that we will retry to open it next time
95 pages_to_scan = strtoull(procfile_lineword(ff_pages_to_scan, 0, 0), NULL, 10);
97 offered = pages_sharing + pages_unshared + pages_volatile;
98 saved = pages_sharing - pages_shared;
100 if(!offered || !pages_to_scan) return 0;
104 // --------------------------------------------------------------------
106 st = rrdset_find("mem.ksm");
108 st = rrdset_create("mem", "ksm", NULL, "ksm", "Kernel Same Page Merging", "MB", 5000, update_every, RRDSET_TYPE_AREA);
110 rrddim_add(st, "shared", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
111 rrddim_add(st, "unshared", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
112 rrddim_add(st, "sharing", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
113 rrddim_add(st, "volatile", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
114 rrddim_add(st, "to_scan", "to scan", -1, 1024 * 1024, RRDDIM_ABSOLUTE);
116 else rrdset_next(st);
118 rrddim_set(st, "shared", pages_shared * page_size);
119 rrddim_set(st, "unshared", pages_unshared * page_size);
120 rrddim_set(st, "sharing", pages_sharing * page_size);
121 rrddim_set(st, "volatile", pages_volatile * page_size);
122 rrddim_set(st, "to_scan", pages_to_scan * page_size);
125 st = rrdset_find("mem.ksm_savings");
127 st = rrdset_create("mem", "ksm_savings", NULL, "ksm", "Kernel Same Page Merging Savings", "MB", 5001, update_every, RRDSET_TYPE_AREA);
129 rrddim_add(st, "savings", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
130 rrddim_add(st, "offered", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
132 else rrdset_next(st);
134 rrddim_set(st, "savings", saved * page_size);
135 rrddim_set(st, "offered", offered * page_size);
138 st = rrdset_find("mem.ksm_ratios");
140 st = rrdset_create("mem", "ksm_ratios", NULL, "ksm", "Kernel Same Page Merging Effectiveness", "percentage", 5002, update_every, RRDSET_TYPE_LINE);
142 rrddim_add(st, "savings", NULL, 1, 10000, RRDDIM_ABSOLUTE);
144 else rrdset_next(st);
146 rrddim_set(st, "savings", (saved * 1000000) / offered);