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-rw-r--r--collectors/proc.plugin/sys_block_zram.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/collectors/proc.plugin/sys_block_zram.c b/collectors/proc.plugin/sys_block_zram.c
new file mode 100644
index 00000000..dac7cac0
--- /dev/null
+++ b/collectors/proc.plugin/sys_block_zram.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "plugin_proc.h"
+
+#define PLUGIN_PROC_MODULE_ZRAM_NAME "/sys/block/zram"
+#define rrdset_obsolete_and_pointer_null(st) do { if(st) { rrdset_is_obsolete___safe_from_collector_thread(st); (st) = NULL; } } while(st)
+
+typedef struct mm_stat {
+ unsigned long long orig_data_size;
+ unsigned long long compr_data_size;
+ unsigned long long mem_used_total;
+ unsigned long long mem_limit;
+ unsigned long long mem_used_max;
+ unsigned long long same_pages;
+ unsigned long long pages_compacted;
+} MM_STAT;
+
+typedef struct zram_device {
+ procfile *file;
+
+ RRDSET *st_usage;
+ RRDDIM *rd_compr_data_size;
+ RRDDIM *rd_metadata_size;
+
+ RRDSET *st_savings;
+ RRDDIM *rd_original_size;
+ RRDDIM *rd_savings_size;
+
+ RRDSET *st_comp_ratio;
+ RRDDIM *rd_comp_ratio;
+
+ RRDSET *st_alloc_efficiency;
+ RRDDIM *rd_alloc_efficiency;
+} ZRAM_DEVICE;
+
+static int try_get_zram_major_number(procfile *file) {
+ size_t i;
+ unsigned int lines = procfile_lines(file);
+ int id = -1;
+ char *name = NULL;
+ for (i = 0; i < lines; i++)
+ {
+ if (procfile_linewords(file, i) < 2)
+ continue;
+ name = procfile_lineword(file, i, 1);
+ if (strcmp(name, "zram") == 0)
+ {
+ id = str2i(procfile_lineword(file, i, 0));
+ if (id == 0)
+ return -1;
+ return id;
+ }
+ }
+ return -1;
+}
+
+static inline void init_rrd(const char *name, ZRAM_DEVICE *d, int update_every) {
+ char chart_name[RRD_ID_LENGTH_MAX + 1];
+
+ snprintfz(chart_name, RRD_ID_LENGTH_MAX, "zram_usage.%s", name);
+ d->st_usage = rrdset_create_localhost(
+ "mem"
+ , chart_name
+ , chart_name
+ , name
+ , "mem.zram_usage"
+ , "ZRAM Memory Usage"
+ , "MiB"
+ , PLUGIN_PROC_NAME
+ , PLUGIN_PROC_MODULE_ZRAM_NAME
+ , NETDATA_CHART_PRIO_MEM_ZRAM
+ , update_every
+ , RRDSET_TYPE_AREA);
+ d->rd_compr_data_size = rrddim_add(d->st_usage, "compressed", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
+ d->rd_metadata_size = rrddim_add(d->st_usage, "metadata", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
+ rrdlabels_add(d->st_usage->rrdlabels, "device", name, RRDLABEL_SRC_AUTO);
+
+ snprintfz(chart_name, RRD_ID_LENGTH_MAX, "zram_savings.%s", name);
+ d->st_savings = rrdset_create_localhost(
+ "mem"
+ , chart_name
+ , chart_name
+ , name
+ , "mem.zram_savings"
+ , "ZRAM Memory Savings"
+ , "MiB"
+ , PLUGIN_PROC_NAME
+ , PLUGIN_PROC_MODULE_ZRAM_NAME
+ , NETDATA_CHART_PRIO_MEM_ZRAM_SAVINGS
+ , update_every
+ , RRDSET_TYPE_AREA);
+ d->rd_savings_size = rrddim_add(d->st_savings, "savings", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
+ d->rd_original_size = rrddim_add(d->st_savings, "original", NULL, 1, 1024 * 1024, RRD_ALGORITHM_ABSOLUTE);
+ rrdlabels_add(d->st_savings->rrdlabels, "device", name, RRDLABEL_SRC_AUTO);
+
+ snprintfz(chart_name, RRD_ID_LENGTH_MAX, "zram_ratio.%s", name);
+ d->st_comp_ratio = rrdset_create_localhost(
+ "mem"
+ , chart_name
+ , chart_name
+ , name
+ , "mem.zram_ratio"
+ , "ZRAM Compression Ratio (original to compressed)"
+ , "ratio"
+ , PLUGIN_PROC_NAME
+ , PLUGIN_PROC_MODULE_ZRAM_NAME
+ , NETDATA_CHART_PRIO_MEM_ZRAM_RATIO
+ , update_every
+ , RRDSET_TYPE_LINE);
+ d->rd_comp_ratio = rrddim_add(d->st_comp_ratio, "ratio", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE);
+ rrdlabels_add(d->st_comp_ratio->rrdlabels, "device", name, RRDLABEL_SRC_AUTO);
+
+ snprintfz(chart_name, RRD_ID_LENGTH_MAX, "zram_efficiency.%s", name);
+ d->st_alloc_efficiency = rrdset_create_localhost(
+ "mem"
+ , chart_name
+ , chart_name
+ , name
+ , "mem.zram_efficiency"
+ , "ZRAM Efficiency"
+ , "percentage"
+ , PLUGIN_PROC_NAME
+ , PLUGIN_PROC_MODULE_ZRAM_NAME
+ , NETDATA_CHART_PRIO_MEM_ZRAM_EFFICIENCY
+ , update_every
+ , RRDSET_TYPE_LINE);
+ d->rd_alloc_efficiency = rrddim_add(d->st_alloc_efficiency, "percent", NULL, 1, 10000, RRD_ALGORITHM_ABSOLUTE);
+ rrdlabels_add(d->st_alloc_efficiency->rrdlabels, "device", name, RRDLABEL_SRC_AUTO);
+}
+
+static int init_devices(DICTIONARY *devices, unsigned int zram_id, int update_every) {
+ int count = 0;
+ struct dirent *de;
+ struct stat st;
+ procfile *ff = NULL;
+ ZRAM_DEVICE device;
+ char filename[FILENAME_MAX + 1];
+
+ snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/dev");
+ DIR *dir = opendir(filename);
+
+ if (unlikely(!dir))
+ return 0;
+ while ((de = readdir(dir)))
+ {
+ snprintfz(filename, FILENAME_MAX, "%s/dev/%s", netdata_configured_host_prefix, de->d_name);
+ if (unlikely(stat(filename, &st) != 0))
+ {
+ collector_error("ZRAM : Unable to stat %s: %s", filename, strerror(errno));
+ continue;
+ }
+ if (major(st.st_rdev) == zram_id)
+ {
+ collector_info("ZRAM : Found device %s", filename);
+ snprintfz(filename, FILENAME_MAX, "%s/sys/block/%s/mm_stat", netdata_configured_host_prefix, de->d_name);
+ ff = procfile_open(filename, " \t:", PROCFILE_FLAG_DEFAULT);
+ if (ff == NULL)
+ {
+ collector_error("ZRAM : Failed to open %s: %s", filename, strerror(errno));
+ continue;
+ }
+ device.file = ff;
+ init_rrd(de->d_name, &device, update_every);
+ dictionary_set(devices, de->d_name, &device, sizeof(ZRAM_DEVICE));
+ count++;
+ }
+ }
+ closedir(dir);
+ return count;
+}
+
+static void free_device(DICTIONARY *dict, const char *name)
+{
+ ZRAM_DEVICE *d = (ZRAM_DEVICE*)dictionary_get(dict, name);
+ collector_info("ZRAM : Disabling monitoring of device %s", name);
+ rrdset_obsolete_and_pointer_null(d->st_usage);
+ rrdset_obsolete_and_pointer_null(d->st_savings);
+ rrdset_obsolete_and_pointer_null(d->st_alloc_efficiency);
+ rrdset_obsolete_and_pointer_null(d->st_comp_ratio);
+ dictionary_del(dict, name);
+}
+
+static inline int read_mm_stat(procfile *ff, MM_STAT *stats) {
+ ff = procfile_readall(ff);
+ if (!ff)
+ return -1;
+ if (procfile_lines(ff) < 1) {
+ procfile_close(ff);
+ return -1;
+ }
+ if (procfile_linewords(ff, 0) < 7) {
+ procfile_close(ff);
+ return -1;
+ }
+
+ stats->orig_data_size = str2ull(procfile_word(ff, 0), NULL);
+ stats->compr_data_size = str2ull(procfile_word(ff, 1), NULL);
+ stats->mem_used_total = str2ull(procfile_word(ff, 2), NULL);
+ stats->mem_limit = str2ull(procfile_word(ff, 3), NULL);
+ stats->mem_used_max = str2ull(procfile_word(ff, 4), NULL);
+ stats->same_pages = str2ull(procfile_word(ff, 5), NULL);
+ stats->pages_compacted = str2ull(procfile_word(ff, 6), NULL);
+ return 0;
+}
+
+static int collect_zram_metrics(const DICTIONARY_ITEM *item, void *entry, void *data) {
+ const char *name = dictionary_acquired_item_name(item);
+ ZRAM_DEVICE *dev = entry;
+ DICTIONARY *dict = data;
+
+ MM_STAT mm;
+ int value;
+
+ if (unlikely(read_mm_stat(dev->file, &mm) < 0)) {
+ free_device(dict, name);
+ return -1;
+ }
+
+ // zram_usage
+ rrddim_set_by_pointer(dev->st_usage, dev->rd_compr_data_size, mm.compr_data_size);
+ rrddim_set_by_pointer(dev->st_usage, dev->rd_metadata_size, mm.mem_used_total - mm.compr_data_size);
+ rrdset_done(dev->st_usage);
+
+ // zram_savings
+ rrddim_set_by_pointer(dev->st_savings, dev->rd_savings_size, mm.compr_data_size - mm.orig_data_size);
+ rrddim_set_by_pointer(dev->st_savings, dev->rd_original_size, mm.orig_data_size);
+ rrdset_done(dev->st_savings);
+
+ // zram_ratio
+ value = mm.compr_data_size == 0 ? 1 : mm.orig_data_size * 100 / mm.compr_data_size;
+ rrddim_set_by_pointer(dev->st_comp_ratio, dev->rd_comp_ratio, value);
+ rrdset_done(dev->st_comp_ratio);
+
+ // zram_efficiency
+ value = mm.mem_used_total == 0 ? 100 : (mm.compr_data_size * 1000000 / mm.mem_used_total);
+ rrddim_set_by_pointer(dev->st_alloc_efficiency, dev->rd_alloc_efficiency, value);
+ rrdset_done(dev->st_alloc_efficiency);
+
+ return 0;
+}
+
+int do_sys_block_zram(int update_every, usec_t dt) {
+ static procfile *ff = NULL;
+ static DICTIONARY *devices = NULL;
+ static int initialized = 0;
+ static int device_count = 0;
+ int zram_id = -1;
+
+ (void)dt;
+
+ if (unlikely(!initialized))
+ {
+ initialized = 1;
+
+ char filename[FILENAME_MAX + 1];
+ snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/devices");
+
+ ff = procfile_open(filename, " \t:", PROCFILE_FLAG_DEFAULT);
+ if (ff == NULL)
+ {
+ collector_error("Cannot read %s", filename);
+ return 1;
+ }
+ ff = procfile_readall(ff);
+ if (!ff)
+ return 1;
+ zram_id = try_get_zram_major_number(ff);
+ if (zram_id == -1)
+ {
+ if (ff != NULL)
+ procfile_close(ff);
+ return 1;
+ }
+ procfile_close(ff);
+
+ devices = dictionary_create_advanced(DICT_OPTION_SINGLE_THREADED, &dictionary_stats_category_collectors, 0);
+ device_count = init_devices(devices, (unsigned int)zram_id, update_every);
+ }
+
+ if (unlikely(device_count < 1))
+ return 1;
+
+ dictionary_walkthrough_write(devices, collect_zram_metrics, devices);
+ return 0;
+} \ No newline at end of file
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