source file for ksm #38

diff --git a/src/sys_kernel_mm_ksm.c b/src/sys_kernel_mm_ksm.c
new file mode 100755 (executable)
index 0000000..7885fa7
--- /dev/null
+++ b/src/sys_kernel_mm_ksm.c
@@ -0,0 +1,150 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+#include "log.h"
+#include "appconfig.h"
+#include "procfile.h"
+#include "rrd.h"
+#include "plugin_proc.h"
+
+typedef struct name_value {
+       char filename[FILENAME_MAX + 1];
+       unsigned long long value;
+} NAME_VALUE;
+
+#define PAGES_SHARED 0
+#define PAGES_SHARING 1
+#define PAGES_UNSHARED 2
+#define PAGES_VOLATILE 3
+#define PAGES_TO_SCAN 4
+
+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, unsigned long long 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(dt) {};
+
+       if(page_size == -1)
+               page_size = sysconf(_SC_PAGESIZE);
+
+       if(!ff_pages_shared) {
+               snprintf(values[PAGES_SHARED].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_shared");
+               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));
+               ff_pages_shared = procfile_open(values[PAGES_SHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
+       }
+
+       if(!ff_pages_sharing) {
+               snprintf(values[PAGES_SHARING].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_sharing");
+               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));
+               ff_pages_sharing = procfile_open(values[PAGES_SHARING].filename, " \t:", PROCFILE_FLAG_DEFAULT);
+       }
+
+       if(!ff_pages_unshared) {
+               snprintf(values[PAGES_UNSHARED].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_unshared");
+               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));
+               ff_pages_unshared = procfile_open(values[PAGES_UNSHARED].filename, " \t:", PROCFILE_FLAG_DEFAULT);
+       }
+
+       if(!ff_pages_volatile) {
+               snprintf(values[PAGES_VOLATILE].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_volatile");
+               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));
+               ff_pages_volatile = procfile_open(values[PAGES_VOLATILE].filename, " \t:", PROCFILE_FLAG_DEFAULT);
+       }
+
+       if(!ff_pages_to_scan) {
+               snprintf(values[PAGES_TO_SCAN].filename, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/kernel/mm/ksm/pages_to_scan");
+               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));
+               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 = strtoull(procfile_lineword(ff_pages_shared, 0, 0), NULL, 10);
+
+       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 = strtoull(procfile_lineword(ff_pages_sharing, 0, 0), NULL, 10);
+
+       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 = strtoull(procfile_lineword(ff_pages_unshared, 0, 0), NULL, 10);
+
+       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 = strtoull(procfile_lineword(ff_pages_volatile, 0, 0), NULL, 10);
+
+       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 = strtoull(procfile_lineword(ff_pages_to_scan, 0, 0), NULL, 10);
+
+       offered = pages_sharing + pages_unshared + pages_volatile;
+       saved = pages_sharing - pages_shared;
+
+       if(!offered || !pages_to_scan) return 0;
+
+       RRDSET *st;
+
+       // --------------------------------------------------------------------
+
+       st = rrdset_find("mem.ksm");
+       if(!st) {
+               st = rrdset_create("mem", "ksm", NULL, "ksm", "Kernel Same Page Merging", "MB", 5000, update_every, RRDSET_TYPE_AREA);
+
+               rrddim_add(st, "shared", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
+               rrddim_add(st, "unshared", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
+               rrddim_add(st, "sharing", NULL, 1, 1024 * 1024, RRDDIM_ABSOLUTE);
+               rrddim_add(st, "volatile", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
+               rrddim_add(st, "to_scan", "to scan", -1, 1024 * 1024, RRDDIM_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("mem.ksm_savings");
+       if(!st) {
+               st = rrdset_create("mem", "ksm_savings", NULL, "ksm", "Kernel Same Page Merging Savings", "MB", 5001, update_every, RRDSET_TYPE_AREA);
+
+               rrddim_add(st, "savings", NULL, -1, 1024 * 1024, RRDDIM_ABSOLUTE);
+               rrddim_add(st, "offered", NULL, 1, 1024 * 1024, RRDDIM_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("mem.ksm_ratios");
+       if(!st) {
+               st = rrdset_create("mem", "ksm_ratios", NULL, "ksm", "Kernel Same Page Merging Effectiveness", "percentage", 5002, update_every, RRDSET_TYPE_LINE);
+
+               rrddim_add(st, "savings", NULL, 1, 10000, RRDDIM_ABSOLUTE);
+       }
+       else rrdset_next(st);
+
+       rrddim_set(st, "savings", (saved * 1000000) / offered);
+       rrdset_done(st);
+
+       return 0;
+}