3 typedef struct ksm_name_value {
4 char filename[FILENAME_MAX + 1];
5 unsigned long long value;
9 #define PAGES_SHARING 1
10 #define PAGES_UNSHARED 2
11 #define PAGES_VOLATILE 3
12 #define PAGES_TO_SCAN 4
14 KSM_NAME_VALUE values[] = {
15 [PAGES_SHARED] = { "/sys/kernel/mm/ksm/pages_shared", 0ULL },
16 [PAGES_SHARING] = { "/sys/kernel/mm/ksm/pages_sharing", 0ULL },
17 [PAGES_UNSHARED] = { "/sys/kernel/mm/ksm/pages_unshared", 0ULL },
18 [PAGES_VOLATILE] = { "/sys/kernel/mm/ksm/pages_volatile", 0ULL },
19 [PAGES_TO_SCAN] = { "/sys/kernel/mm/ksm/pages_to_scan", 0ULL },
22 int do_sys_kernel_mm_ksm(int update_every, usec_t dt) {
24 static procfile *ff_pages_shared = NULL, *ff_pages_sharing = NULL, *ff_pages_unshared = NULL, *ff_pages_volatile = NULL, *ff_pages_to_scan = NULL;
25 static long page_size = -1;
28 page_size = sysconf(_SC_PAGESIZE);
30 if(!ff_pages_shared) {
31 snprintfz(values[PAGES_SHARED].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_shared");
32 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));
33 ff_pages_shared = procfile_open(values[PAGES_SHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
36 if(!ff_pages_sharing) {
37 snprintfz(values[PAGES_SHARING].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_sharing");
38 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));
39 ff_pages_sharing = procfile_open(values[PAGES_SHARING].filename, " \t:", PROCFILE_FLAG_DEFAULT);
42 if(!ff_pages_unshared) {
43 snprintfz(values[PAGES_UNSHARED].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_unshared");
44 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));
45 ff_pages_unshared = procfile_open(values[PAGES_UNSHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
48 if(!ff_pages_volatile) {
49 snprintfz(values[PAGES_VOLATILE].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_volatile");
50 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));
51 ff_pages_volatile = procfile_open(values[PAGES_VOLATILE].filename, " \t:", PROCFILE_FLAG_DEFAULT);
54 if(!ff_pages_to_scan) {
55 snprintfz(values[PAGES_TO_SCAN].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_to_scan");
56 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));
57 ff_pages_to_scan = procfile_open(values[PAGES_TO_SCAN].filename, " \t:", PROCFILE_FLAG_DEFAULT);
60 if(!ff_pages_shared || !ff_pages_sharing || !ff_pages_unshared || !ff_pages_volatile || !ff_pages_to_scan) return 1;
62 unsigned long long pages_shared = 0, pages_sharing = 0, pages_unshared = 0, pages_volatile = 0, pages_to_scan = 0, offered = 0, saved = 0;
64 ff_pages_shared = procfile_readall(ff_pages_shared);
65 if(!ff_pages_shared) return 0; // we return 0, so that we will retry to open it next time
66 pages_shared = str2ull(procfile_lineword(ff_pages_shared, 0, 0));
68 ff_pages_sharing = procfile_readall(ff_pages_sharing);
69 if(!ff_pages_sharing) return 0; // we return 0, so that we will retry to open it next time
70 pages_sharing = str2ull(procfile_lineword(ff_pages_sharing, 0, 0));
72 ff_pages_unshared = procfile_readall(ff_pages_unshared);
73 if(!ff_pages_unshared) return 0; // we return 0, so that we will retry to open it next time
74 pages_unshared = str2ull(procfile_lineword(ff_pages_unshared, 0, 0));
76 ff_pages_volatile = procfile_readall(ff_pages_volatile);
77 if(!ff_pages_volatile) return 0; // we return 0, so that we will retry to open it next time
78 pages_volatile = str2ull(procfile_lineword(ff_pages_volatile, 0, 0));
80 ff_pages_to_scan = procfile_readall(ff_pages_to_scan);
81 if(!ff_pages_to_scan) return 0; // we return 0, so that we will retry to open it next time
82 pages_to_scan = str2ull(procfile_lineword(ff_pages_to_scan, 0, 0));
84 offered = pages_sharing + pages_shared + pages_unshared + pages_volatile;
85 saved = pages_sharing - pages_shared;
87 if(!offered || !pages_to_scan) return 0;
91 // --------------------------------------------------------------------
93 st = rrdset_find("mem.ksm");
95 st = rrdset_create("mem", "ksm", NULL, "ksm", NULL, "Kernel Same Page Merging", "MB", 5000, update_every, RRDSET_TYPE_AREA);
97 rrddim_add(st, "shared", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
98 rrddim_add(st, "unshared", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
99 rrddim_add(st, "sharing", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
100 rrddim_add(st, "volatile", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
101 rrddim_add(st, "to_scan", "to scan", -1, 1024 * 1024, RRDDIM_ABSOLUTE);
103 else rrdset_next(st);
105 rrddim_set(st, "shared", pages_shared * page_size);
106 rrddim_set(st, "unshared", pages_unshared * page_size);
107 rrddim_set(st, "sharing", pages_sharing * page_size);
108 rrddim_set(st, "volatile", pages_volatile * page_size);
109 rrddim_set(st, "to_scan", pages_to_scan * page_size);
112 st = rrdset_find("mem.ksm_savings");
114 st = rrdset_create("mem", "ksm_savings", NULL, "ksm", NULL, "Kernel Same Page Merging Savings", "MB", 5001, update_every, RRDSET_TYPE_AREA);
116 rrddim_add(st, "savings", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
117 rrddim_add(st, "offered", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
119 else rrdset_next(st);
121 rrddim_set(st, "savings", saved * page_size);
122 rrddim_set(st, "offered", offered * page_size);
125 st = rrdset_find("mem.ksm_ratios");
127 st = rrdset_create("mem", "ksm_ratios", NULL, "ksm", NULL, "Kernel Same Page Merging Effectiveness", "percentage", 5002, update_every, RRDSET_TYPE_LINE);
129 rrddim_add(st, "savings", NULL, 1, 10000, RRDDIM_ABSOLUTE);
131 else rrdset_next(st);
133 rrddim_set(st, "savings", (saved * 1000000) / offered);