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netdata/collectors/proc.plugin/proc_pagetypeinfo.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
// For ULONG_MAX
#include <limits.h>
#define PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME "/proc/pagetypeinfo"
#define CONFIG_SECTION_PLUGIN_PROC_PAGETYPEINFO "plugin:" PLUGIN_PROC_CONFIG_NAME ":" PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME
// Zone struct is pglist_data, in include/linux/mmzone.h
// MAX_NR_ZONES is from __MAX_NR_ZONE, which is the last value of the enum.
#define MAX_PAGETYPE_ORDER 11
// Names are in mm/page_alloc.c :: migratetype_names. Max size = 10.
#define MAX_ZONETYPE_NAME 16
#define MAX_PAGETYPE_NAME 16
// Defined in include/linux/mmzone.h as __MAX_NR_ZONE (last enum of zone_type)
#define MAX_ZONETYPE 6
// Defined in include/linux/mmzone.h as MIGRATE_TYPES (last enum of migratetype)
#define MAX_PAGETYPE 7
//
// /proc/pagetypeinfo is declared in mm/vmstat.c :: init_mm_internals
//
// One line of /proc/pagetypeinfo
struct pageline {
int node;
char *zone;
char *type;
int line;
uint64_t free_pages_size[MAX_PAGETYPE_ORDER];
RRDDIM *rd[MAX_PAGETYPE_ORDER];
};
// Sum of all orders
struct systemorder {
uint64_t size;
RRDDIM *rd;
};
static inline uint64_t pageline_total_count(struct pageline *p) {
uint64_t sum = 0, o;
for (o=0; o<MAX_PAGETYPE_ORDER; o++)
sum += p->free_pages_size[o];
return sum;
}
// Check if a line of /proc/pagetypeinfo is valid to use
// Free block lines starts by "Node" && 4th col is "type"
#define pagetypeinfo_line_valid(ff, l) (strncmp(procfile_lineword(ff, l, 0), "Node", 4) == 0 && strncmp(procfile_lineword(ff, l, 4), "type", 4) == 0)
// Dimension name from the order
#define dim_name(s, o, pagesize) (snprintfz(s, 16,"%ldKB (%lu)", (1 << o) * pagesize / 1024, o))
int do_proc_pagetypeinfo(int update_every, usec_t dt) {
(void)dt;
// Config
static int do_global, do_detail;
static SIMPLE_PATTERN *filter_types = NULL;
// Counters from parsing the file, that doesn't change after boot
static struct systemorder systemorders[MAX_PAGETYPE_ORDER] = {};
static struct pageline* pagelines = NULL;
static long pagesize = 0;
static size_t pageorders_cnt = 0, pagelines_cnt = 0, ff_lines = 0;
// Handle
static procfile *ff = NULL;
static char ff_path[FILENAME_MAX + 1];
// RRD Sets
static RRDSET *st_order = NULL;
static RRDSET **st_nodezonetype = NULL;
// Local temp variables
size_t l, o, p;
struct pageline *pgl = NULL;
// --------------------------------------------------------------------
// Startup: Init arch and open /proc/pagetypeinfo
if (unlikely(!pagesize)) {
pagesize = sysconf(_SC_PAGESIZE);
}
if(unlikely(!ff)) {
snprintfz(ff_path, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME);
ff = procfile_open(config_get(CONFIG_SECTION_PLUGIN_PROC_PAGETYPEINFO, "filename to monitor", ff_path), " \t:", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) {
strncpyz(ff_path, PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME, FILENAME_MAX);
ff = procfile_open(PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME, " \t,", PROCFILE_FLAG_DEFAULT);
}
}
if(unlikely(!ff))
return 1;
ff = procfile_readall(ff);
if(unlikely(!ff))
return 0; // we return 0, so that we will retry to open it next time
// --------------------------------------------------------------------
// Init: find how many Nodes, Zones and Types
if(unlikely(pagelines_cnt == 0)) {
size_t nodenumlast = -1;
char *zonenamelast = NULL;
ff_lines = procfile_lines(ff);
if(unlikely(!ff_lines)) {
error("PLUGIN: PROC_PAGETYPEINFO: Cannot read %s, zero lines reported.", ff_path);
return 1;
}
// Configuration
do_global = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_PAGETYPEINFO, "enable system summary", CONFIG_BOOLEAN_YES);
do_detail = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_PAGETYPEINFO, "enable detail per-type", CONFIG_BOOLEAN_AUTO);
filter_types = simple_pattern_create(
config_get(CONFIG_SECTION_PLUGIN_PROC_PAGETYPEINFO, "hide charts id matching", "")
, NULL
, SIMPLE_PATTERN_SUFFIX
);
pagelines_cnt = 0;
// Pass 1: how many lines would be valid
for (l = 4; l < ff_lines; l++) {
if (!pagetypeinfo_line_valid(ff, l))
continue;
pagelines_cnt++;
}
if (pagelines_cnt == 0) {
error("PLUGIN: PROC_PAGETYPEINFO: Unable to parse any valid line in %s", ff_path);
return 1;
}
// 4th line is the "Free pages count per migrate type at order". Just substract these 8 words.
pageorders_cnt = procfile_linewords(ff, 3);
if (pageorders_cnt < 9) {
error("PLUGIN: PROC_PAGETYPEINFO: Unable to parse Line 4 of %s", ff_path);
return 1;
}
pageorders_cnt -= 9;
if (pageorders_cnt > MAX_PAGETYPE_ORDER) {
error("PLUGIN: PROC_PAGETYPEINFO: pageorder found (%lu) is higher than max %d", pageorders_cnt, MAX_PAGETYPE_ORDER);
return 1;
}
// Init pagelines from scanned lines
if (!pagelines) {
pagelines = callocz(pagelines_cnt, sizeof(struct pageline));
if (!pagelines) {
error("PLUGIN: PROC_PAGETYPEINFO: Cannot allocate %lu pagelines of %lu B", pagelines_cnt, sizeof(struct pageline));
return 1;
}
}
// Pass 2: Scan the file again, with details
p = 0;
for (l=4; l < ff_lines; l++) {
if (!pagetypeinfo_line_valid(ff, l))
continue;
size_t nodenum = strtoul(procfile_lineword(ff, l, 1), NULL, 10);
char *zonename = procfile_lineword(ff, l, 3);
char *typename = procfile_lineword(ff, l, 5);
// We changed node or zone
if (nodenum != nodenumlast || !zonenamelast || strncmp(zonename, zonenamelast, 6) != 0) {
zonenamelast = zonename;
}
// Populate the line
pgl = &pagelines[p];
pgl->line = l;
pgl->node = nodenum;
pgl->type = typename;
pgl->zone = zonename;
for (o = 0; o < pageorders_cnt; o++)
pgl->free_pages_size[o] = str2uint64_t(procfile_lineword(ff, l, o+6)) * 1 << o;
p++;
}
// Init the RRD graphs
// Per-Order: sum of all node, zone, type Grouped by order
if (do_global != CONFIG_BOOLEAN_NO) {
st_order = rrdset_create_localhost(
"mem"
, "pagetype_global"
, NULL
, "pagetype"
, NULL
, "System orders available"
, "B"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME
, NETDATA_CHART_PRIO_MEM_PAGEFRAG
, update_every
, RRDSET_TYPE_STACKED
);
for (o = 0; o < pageorders_cnt; o++) {
char id[3+1];
snprintfz(id, 3, "%lu", o);
char name[20+1];
dim_name(name, o, pagesize);
systemorders[o].rd = rrddim_add(st_order, id, name, pagesize, 1, RRD_ALGORITHM_ABSOLUTE);
}
}
// Per-Numa Node & Zone & Type (full detail). Only if sum(line) > 0
st_nodezonetype = callocz(pagelines_cnt, sizeof(RRDSET));
for (p = 0; p < pagelines_cnt; p++) {
pgl = &pagelines[p];
// Skip invalid, refused or empty pagelines if not explicitely requested
if (!pgl
|| do_detail == CONFIG_BOOLEAN_NO
|| (do_detail == CONFIG_BOOLEAN_AUTO && pageline_total_count(pgl) == 0 && netdata_zero_metrics_enabled != CONFIG_BOOLEAN_YES))
continue;
// "pagetype Node" + NUMA-NodeId + ZoneName + TypeName
char setid[13+1+2+1+MAX_ZONETYPE_NAME+1+MAX_PAGETYPE_NAME+1];
snprintfz(setid, 13+1+2+1+MAX_ZONETYPE_NAME+1+MAX_PAGETYPE_NAME, "pagetype_Node%d_%s_%s", pgl->node, pgl->zone, pgl->type);
// Skip explicitely refused charts
if (simple_pattern_matches(filter_types, setid))
continue;
// "Node" + NUMA-NodeID + ZoneName + TypeName
char setname[4+1+MAX_ZONETYPE_NAME+1+MAX_PAGETYPE_NAME +1];
snprintfz(setname, MAX_ZONETYPE_NAME + MAX_PAGETYPE_NAME, "Node %d %s %s",
pgl->node, pgl->zone, pgl->type);
st_nodezonetype[p] = rrdset_create_localhost(
"mem"
, setid
, NULL
, "pagetype"
, NULL
, setname
, "B"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_PAGETYPEINFO_NAME
, NETDATA_CHART_PRIO_MEM_PAGEFRAG + 1 + p
, update_every
, RRDSET_TYPE_STACKED
);
for (o = 0; o < pageorders_cnt; o++) {
char dimid[3+1];
snprintfz(dimid, 3, "%lu", o);
char dimname[20+1];
dim_name(dimname, o, pagesize);
pgl->rd[o] = rrddim_add(st_nodezonetype[p], dimid, dimname, pagesize, 1, RRD_ALGORITHM_ABSOLUTE);
}
}
}
// --------------------------------------------------------------------
// Update pagelines
// Process each line
p = 0;
for (l=4; l<ff_lines; l++) {
if (!pagetypeinfo_line_valid(ff, l))
continue;
size_t words = procfile_linewords(ff, l);
if (words != 7+pageorders_cnt) {
error("PLUGIN: PROC_PAGETYPEINFO: Unable to read line %lu, %lu words found instead of %lu", l+1, words, 7+pageorders_cnt);
break;
}
for (o = 0; o < pageorders_cnt; o++) {
// Reset counter
if (p == 0)
systemorders[o].size = 0;
// Update orders of the current line
pagelines[p].free_pages_size[o] = str2uint64_t(procfile_lineword(ff, l, o+6)) * 1 << o;
// Update sum by order
systemorders[o].size += pagelines[p].free_pages_size[o];
}
p++;
}
// --------------------------------------------------------------------
// update RRD values
// Global system per order
if (st_order) {
rrdset_next(st_order);
for (o = 0; o < pageorders_cnt; o++) {
rrddim_set_by_pointer(st_order, systemorders[o].rd, systemorders[o].size);
}
rrdset_done(st_order);
}
// Per Node-Zone-Type
if (do_detail) {
for (p = 0; p < pagelines_cnt; p++) {
// Skip empty graphs
if (!st_nodezonetype[p])
continue;
rrdset_next(st_nodezonetype[p]);
for (o = 0; o < pageorders_cnt; o++)
rrddim_set_by_pointer(st_nodezonetype[p], pagelines[p].rd[o], pagelines[p].free_pages_size[o]);
rrdset_done(st_nodezonetype[p]);
}
}
return 0;
}
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