summaryrefslogtreecommitdiffstats
path: root/collectors/proc.plugin/sys_kernel_mm_ksm.c
blob: 0b64987c9e65db608a6526b5a4345509bd4b6e97 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
// 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*/)) 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_AREA
            );

            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);
        }
        else
            rrdset_next(st_mem_ksm);

        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);
        }
        else
            rrdset_next(st_mem_ksm_savings);

        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);
        }
        else
            rrdset_next(st_mem_ksm_ratios);

        rrddim_set_by_pointer(st_mem_ksm_ratios, rd_savings, (saved * 1000000) / offered);

        rrdset_done(st_mem_ksm_ratios);
    }

    return 0;
}