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ngx_http_slab_stat_module.c
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ngx_http_slab_stat_module.c
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/*
* Copyright (C) 2017 Alibaba Group Holding Limited
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_slab.h>
static char *ngx_http_slab_stat(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t ngx_http_slab_stat_buf(ngx_pool_t *pool, ngx_buf_t *b);
static ngx_command_t ngx_http_slab_stat_commands[] = {
{ ngx_string("slab_stat"),
NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
ngx_http_slab_stat,
0,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_slab_stat_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configuration */
NULL /* merge location configuration */
};
ngx_module_t ngx_http_slab_stat_module = {
NGX_MODULE_V1,
&ngx_http_slab_stat_module_ctx, /* module context */
ngx_http_slab_stat_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static ngx_int_t
ngx_http_slab_stat_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t out;
if (r->method != NGX_HTTP_GET) {
return NGX_HTTP_NOT_ALLOWED;
}
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
return rc;
}
b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_http_slab_stat_buf(r->pool, b) == NGX_ERROR) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
r->headers_out.status = NGX_HTTP_OK;
r->headers_out.content_length_n = b->last - b->pos;
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
out.buf = b;
out.next = NULL;
return ngx_http_output_filter(r, &out);
}
static ngx_int_t
ngx_http_slab_stat_buf(ngx_pool_t *pool, ngx_buf_t *b)
{
u_char *p;
size_t pz, size;
ngx_uint_t i, k, n;
ngx_shm_zone_t *shm_zone;
ngx_slab_pool_t *shpool;
ngx_slab_page_t *page;
ngx_slab_stat_t *stats;
volatile ngx_list_part_t *part;
#define NGX_SLAB_SHM_SIZE (sizeof("* shared memory: \n") - 1)
#define NGX_SLAB_SHM_FORMAT "* shared memory: %V\n"
#define NGX_SLAB_SUMMARY_SIZE \
(3 * 12 + sizeof("total:(KB) free:(KB) size:(KB)\n") - 1)
#define NGX_SLAB_SUMMARY_FORMAT \
"total:%12z(KB) free:%12z(KB) size:%12z(KB)\n"
#define NGX_SLAB_PAGE_ENTRY_SIZE \
(12 + 2 * 16 + sizeof("pages:(KB) start: end:\n") - 1)
#define NGX_SLAB_PAGE_ENTRY_FORMAT \
"pages:%12z(KB) start:%p end:%p\n"
#define NGX_SLAB_SLOT_ENTRY_SIZE \
(12 * 5 + sizeof("slot:(Bytes) total: used: reqs: fails:\n") - 1)
#define NGX_SLAB_SLOT_ENTRY_FORMAT \
"slot:%12z(Bytes) total:%12z used:%12z reqs:%12z fails:%12z\n"
pz = 0;
/* query shared memory */
part = &ngx_cycle->shared_memory.part;
shm_zone = part->elts;
for (i = 0; /* void */ ; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
shm_zone = part->elts;
i = 0;
}
pz += NGX_SLAB_SHM_SIZE + (size_t)shm_zone[i].shm.name.len;
pz += NGX_SLAB_SUMMARY_SIZE;
shpool = (ngx_slab_pool_t *) shm_zone[i].shm.addr;
ngx_shmtx_lock(&shpool->mutex);
for (page = shpool->free.next; page != &shpool->free; page = page->next) {
pz += NGX_SLAB_PAGE_ENTRY_SIZE;
}
n = ngx_pagesize_shift - shpool->min_shift;
ngx_shmtx_unlock(&shpool->mutex);
for (k = 0; k < n; k++) {
pz += NGX_SLAB_SLOT_ENTRY_SIZE;
}
}
/* preallocate pz * 2 to make sure memory enough */
p = ngx_palloc(pool, pz * 2);
if (p == NULL) {
return NGX_ERROR;
}
b->pos = p;
size = 1 << ngx_pagesize_shift;
part = &ngx_cycle->shared_memory.part;
shm_zone = part->elts;
for (i = 0; /* void */ ; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
shm_zone = part->elts;
i = 0;
}
shpool = (ngx_slab_pool_t *) shm_zone[i].shm.addr;
p = ngx_snprintf(p, NGX_SLAB_SHM_SIZE + shm_zone[i].shm.name.len,
NGX_SLAB_SHM_FORMAT, &shm_zone[i].shm.name);
ngx_shmtx_lock(&shpool->mutex);
p = ngx_snprintf(p, NGX_SLAB_SUMMARY_SIZE, NGX_SLAB_SUMMARY_FORMAT,
shm_zone[i].shm.size / 1024, shpool->pfree * size / 1024,
size / 1024, shpool->pfree);
for (page = shpool->free.next; page != &shpool->free; page = page->next) {
p = ngx_snprintf(p, NGX_SLAB_PAGE_ENTRY_SIZE,
NGX_SLAB_PAGE_ENTRY_FORMAT, page->slab * size / 1024,
shpool->start, shpool->end);
}
stats = shpool->stats;
n = ngx_pagesize_shift - shpool->min_shift;
for (k = 0; k < n; k++) {
p = ngx_snprintf(p, NGX_SLAB_SLOT_ENTRY_SIZE, NGX_SLAB_SLOT_ENTRY_FORMAT,
1 << (k + shpool->min_shift),
stats[k].total, stats[k].used, stats[k].reqs, stats[k].fails);
}
ngx_shmtx_unlock(&shpool->mutex);
}
b->last = p;
b->memory = 1;
b->last_buf = 1;
return NGX_OK;
}
static char *
ngx_http_slab_stat(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
clcf->handler = ngx_http_slab_stat_handler;
return NGX_CONF_OK;
}