diff options
Diffstat (limited to '')
| -rw-r--r-- | collectors/proc.plugin/proc_pressure.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_pressure.c b/collectors/proc.plugin/proc_pressure.c new file mode 100644 index 00000000..4037e60a --- /dev/null +++ b/collectors/proc.plugin/proc_pressure.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "plugin_proc.h" + +#define PLUGIN_PROC_MODULE_PRESSURE_NAME "/proc/pressure" +#define CONFIG_SECTION_PLUGIN_PROC_PRESSURE "plugin:" PLUGIN_PROC_CONFIG_NAME ":" PLUGIN_PROC_MODULE_PRESSURE_NAME + +// linux calculates this every 2 seconds, see kernel/sched/psi.c PSI_FREQ +#define MIN_PRESSURE_UPDATE_EVERY 2 + +static int pressure_update_every = 0; + +static struct pressure resources[PRESSURE_NUM_RESOURCES] = { + { + .some = { + .available = true, + .share_time = {.id = "cpu_some_pressure", .title = "CPU some pressure"}, + .total_time = {.id = "cpu_some_pressure_stall_time", .title = "CPU some pressure stall time"} + }, + .full = { + // Disable CPU full pressure. + // See https://github.com/torvalds/linux/commit/890d550d7dbac7a31ecaa78732aa22be282bb6b8 + .available = false, + .share_time = {.id = "cpu_full_pressure", .title = "CPU full pressure"}, + .total_time = {.id = "cpu_full_pressure_stall_time", .title = "CPU full pressure stall time"} + }, + }, + { + .some = { + .available = true, + .share_time = {.id = "memory_some_pressure", .title = "Memory some pressure"}, + .total_time = {.id = "memory_some_pressure_stall_time", .title = "Memory some pressure stall time"} + }, + .full = { + .available = true, + .share_time = {.id = "memory_full_pressure", .title = "Memory full pressure"}, + .total_time = {.id = "memory_full_pressure_stall_time", .title = "Memory full pressure stall time"} + }, + }, + { + .some = { + .available = true, + .share_time = {.id = "io_some_pressure", .title = "I/O some pressure"}, + .total_time = {.id = "io_some_pressure_stall_time", .title = "I/O some pressure stall time"} + }, + .full = { + .available = true, + .share_time = {.id = "io_full_pressure", .title = "I/O full pressure"}, + .total_time = {.id = "io_full_pressure_stall_time", .title = "I/O full pressure stall time"} + }, + }, + { + .some = { + // this is not available + .available = false, + .share_time = {.id = "irq_some_pressure", .title = "IRQ some pressure"}, + .total_time = {.id = "irq_some_pressure_stall_time", .title = "IRQ some pressure stall time"} + }, + .full = { + .available = true, + .share_time = {.id = "irq_full_pressure", .title = "IRQ full pressure"}, + .total_time = {.id = "irq_full_pressure_stall_time", .title = "IRQ full pressure stall time"} + }, + }, +}; + +static struct resource_info { + procfile *pf; + const char *name; // metric file name + const char *family; // webui section name + int section_priority; +} resource_info[PRESSURE_NUM_RESOURCES] = { + { .name = "cpu", .family = "cpu", .section_priority = NETDATA_CHART_PRIO_SYSTEM_CPU }, + { .name = "memory", .family = "ram", .section_priority = NETDATA_CHART_PRIO_SYSTEM_RAM }, + { .name = "io", .family = "disk", .section_priority = NETDATA_CHART_PRIO_SYSTEM_IO }, + { .name = "irq", .family = "interrupts", .section_priority = NETDATA_CHART_PRIO_SYSTEM_INTERRUPTS }, +}; + +void update_pressure_charts(struct pressure_charts *pcs) { + if (pcs->share_time.st) { + rrddim_set_by_pointer( + pcs->share_time.st, pcs->share_time.rd10, (collected_number)(pcs->share_time.value10 * 100)); + rrddim_set_by_pointer( + pcs->share_time.st, pcs->share_time.rd60, (collected_number)(pcs->share_time.value60 * 100)); + rrddim_set_by_pointer( + pcs->share_time.st, pcs->share_time.rd300, (collected_number)(pcs->share_time.value300 * 100)); + rrdset_done(pcs->share_time.st); + } + if (pcs->total_time.st) { + rrddim_set_by_pointer( + pcs->total_time.st, pcs->total_time.rdtotal, (collected_number)(pcs->total_time.value_total)); + rrdset_done(pcs->total_time.st); + } +} + +static void proc_pressure_do_resource(procfile *ff, int res_idx, size_t line, bool some) { + struct pressure_charts *pcs; + struct resource_info ri; + pcs = some ? &resources[res_idx].some : &resources[res_idx].full; + ri = resource_info[res_idx]; + + if (unlikely(!pcs->share_time.st)) { + pcs->share_time.st = rrdset_create_localhost( + "system", + pcs->share_time.id, + NULL, + ri.family, + NULL, + pcs->share_time.title, + "percentage", + PLUGIN_PROC_NAME, + PLUGIN_PROC_MODULE_PRESSURE_NAME, + ri.section_priority + (some ? 40 : 50), + pressure_update_every, + RRDSET_TYPE_LINE); + pcs->share_time.rd10 = + rrddim_add(pcs->share_time.st, some ? "some 10" : "full 10", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE); + pcs->share_time.rd60 = + rrddim_add(pcs->share_time.st, some ? "some 60" : "full 60", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE); + pcs->share_time.rd300 = + rrddim_add(pcs->share_time.st, some ? "some 300" : "full 300", NULL, 1, 100, RRD_ALGORITHM_ABSOLUTE); + } + + pcs->share_time.value10 = strtod(procfile_lineword(ff, line, 2), NULL); + pcs->share_time.value60 = strtod(procfile_lineword(ff, line, 4), NULL); + pcs->share_time.value300 = strtod(procfile_lineword(ff, line, 6), NULL); + + if (unlikely(!pcs->total_time.st)) { + pcs->total_time.st = rrdset_create_localhost( + "system", + pcs->total_time.id, + NULL, + ri.family, + NULL, + pcs->total_time.title, + "ms", + PLUGIN_PROC_NAME, + PLUGIN_PROC_MODULE_PRESSURE_NAME, + ri.section_priority + (some ? 45 : 55), + pressure_update_every, + RRDSET_TYPE_LINE); + pcs->total_time.rdtotal = rrddim_add(pcs->total_time.st, "time", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL); + } + + pcs->total_time.value_total = str2ull(procfile_lineword(ff, line, 8), NULL) / 1000; +} + +static void proc_pressure_do_resource_some(procfile *ff, int res_idx, size_t line) { + proc_pressure_do_resource(ff, res_idx, line, true); +} + +static void proc_pressure_do_resource_full(procfile *ff, int res_idx, size_t line) { + proc_pressure_do_resource(ff, res_idx, line, false); +} + +int do_proc_pressure(int update_every, usec_t dt) { + int ok_count = 0; + int i; + + static usec_t next_pressure_dt = 0; + static char *base_path = NULL; + + update_every = (update_every < MIN_PRESSURE_UPDATE_EVERY) ? MIN_PRESSURE_UPDATE_EVERY : update_every; + pressure_update_every = update_every; + + if (next_pressure_dt <= dt) { + next_pressure_dt = update_every * USEC_PER_SEC; + } else { + next_pressure_dt -= dt; + return 0; + } + + if (unlikely(!base_path)) { + base_path = config_get(CONFIG_SECTION_PLUGIN_PROC_PRESSURE, "base path of pressure metrics", "/proc/pressure"); + } + + for (i = 0; i < PRESSURE_NUM_RESOURCES; i++) { + procfile *ff = resource_info[i].pf; + int do_some = resources[i].some.enabled, do_full = resources[i].full.enabled; + + if (!resources[i].some.available && !resources[i].full.available) + continue; + + if (unlikely(!ff)) { + char filename[FILENAME_MAX + 1]; + char config_key[CONFIG_MAX_NAME + 1]; + + snprintfz(filename + , FILENAME_MAX + , "%s%s/%s" + , netdata_configured_host_prefix + , base_path + , resource_info[i].name); + + do_some = resources[i].some.available ? CONFIG_BOOLEAN_YES : CONFIG_BOOLEAN_NO; + do_full = resources[i].full.available ? CONFIG_BOOLEAN_YES : CONFIG_BOOLEAN_NO; + + snprintfz(config_key, CONFIG_MAX_NAME, "enable %s some pressure", resource_info[i].name); + do_some = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_PRESSURE, config_key, do_some); + resources[i].some.enabled = do_some; + + snprintfz(config_key, CONFIG_MAX_NAME, "enable %s full pressure", resource_info[i].name); + do_full = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_PRESSURE, config_key, do_full); + resources[i].full.enabled = do_full; + + if (!do_full && !do_some) { + resources[i].some.available = false; + resources[i].full.available = false; + continue; + } + + ff = procfile_open(filename, " =", PROCFILE_FLAG_NO_ERROR_ON_FILE_IO); + if (unlikely(!ff)) { + // PSI IRQ was added recently (https://github.com/torvalds/linux/commit/52b1364ba0b105122d6de0e719b36db705011ac1) + if (strcmp(resource_info[i].name, "irq") != 0) + collector_error("Cannot read pressure information from %s.", filename); + resources[i].some.available = false; + resources[i].full.available = false; + continue; + } + } + + ff = procfile_readall(ff); + resource_info[i].pf = ff; + if (unlikely(!ff)) + continue; + + size_t lines = procfile_lines(ff); + if (unlikely(lines < 1)) { + collector_error("%s has no lines.", procfile_filename(ff)); + continue; + } + + for(size_t l = 0; l < lines ;l++) { + const char *key = procfile_lineword(ff, l, 0); + if(strcmp(key, "some") == 0) { + if(do_some) { + proc_pressure_do_resource_some(ff, i, l); + update_pressure_charts(&resources[i].some); + ok_count++; + } + } + else if(strcmp(key, "full") == 0) { + if(do_full) { + proc_pressure_do_resource_full(ff, i, l); + update_pressure_charts(&resources[i].full); + ok_count++; + } + } + } + } + + if(!ok_count) + return 1; + + return 0; +} |