diff options
Diffstat (limited to 'src/sys_kernel_mm_ksm.c')
| -rwxr-xr-x | src/sys_kernel_mm_ksm.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/sys_kernel_mm_ksm.c b/src/sys_kernel_mm_ksm.c new file mode 100755 index 000000000..822e0d41a --- /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", NULL, "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", NULL, "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", NULL, "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; +} |