/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2008-2009, Intel Corporation. * All Rights Reserved. */ #include <stdio.h> #include <stdlib.h> #include <memory.h> #include <string.h> #include <procfs.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <limits.h> #include <unistd.h> #include "latencytop.h" static GHashTable *proc_table = NULL; /* pid -> char * */ static GHashTable *klog_table = NULL; /* char * -> uint64_t total */ static char klog_filename[PATH_MAX] = DEFAULT_KLOG_FILE; static int klog_level = LT_KLOG_LEVEL_NONE; static void print_proc(void *key, const char *args, FILE *fp) { (void) fprintf(fp, "%-8ld \"%s\"\n", (long)key, args); } static void print_stat(const char *key, lt_stat_data_t *log, FILE *fp) { (void) fprintf(fp, "%lld, %lld, %lld, %s\n", (long long)log->lt_s_total, (long long)log->lt_s_count, (long long)log->lt_s_max, key); } /* * Initialization for kernel logging. */ void lt_klog_init(void) { if (klog_table != NULL || proc_table != NULL) { return; } klog_table = g_hash_table_new_full(g_str_hash, g_str_equal, (GDestroyNotify)free, (GDestroyNotify)free); lt_check_null(klog_table); proc_table = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, (GDestroyNotify)free); lt_check_null(proc_table); } /* * Set log file path. */ int lt_klog_set_log_file(const char *filename) { FILE *fp; int file_exist; g_assert(strlen(filename) < sizeof (klog_filename)); file_exist = lt_file_exist(filename); /* Test if we can write to the file */ fp = fopen(filename, "a"); if (fp == NULL) { return (-2); } (void) fclose(fp); /* Don't leave empty file around */ if (!file_exist) { (void) unlink(filename); } (void) strncpy(klog_filename, filename, sizeof (klog_filename)); return (0); } /* * Set log level. */ int lt_klog_set_log_level(int level) { if (level < 0 || level > (int)LT_KLOG_LEVEL_ALL) { return (-1); } klog_level = level; return (0); } /* * Write content to log file. */ void lt_klog_write(void) { FILE *fp; char buffer[32]; if (klog_level == LT_KLOG_LEVEL_NONE) { return; } g_assert(klog_table != NULL && proc_table != NULL); fp = fopen(klog_filename, "a"); if (fp == NULL) { return; } lt_time_str(buffer, sizeof (buffer)); (void) fprintf(fp, "# Log generated at %s by %s\n", buffer, TITLE); (void) fprintf(fp, "# List of processes\n"); (void) fprintf(fp, "PID, CMD\n"); g_hash_table_foreach(proc_table, (GHFunc)print_proc, fp); (void) fprintf(fp, "# Statistics\n"); (void) fprintf(fp, "TOTAL, COUNT, MAX, PID, KSTACK\n"); g_hash_table_foreach(klog_table, (GHFunc)print_stat, fp); (void) fclose(fp); } /* * Clean up. It flushes all log content in memory to log file. */ void lt_klog_deinit(void) { if (klog_table != NULL) { g_hash_table_destroy(klog_table); klog_table = NULL; } if (proc_table != NULL) { g_hash_table_destroy(proc_table); proc_table = NULL; } } /* * Write a kernel stack and its statistics to log file. Only "total" will * be logged, others are internally discarded. */ /* ARGSUSED */ void lt_klog_log(int level, pid_t pid, char *stack, lt_stat_type_t type, uint64_t value) { lt_stat_data_t *entry = NULL; char *psargs; char *str; int str_len; if ((level & klog_level) == 0) { return; } g_assert(klog_table != NULL && proc_table != NULL); psargs = (char *)g_hash_table_lookup(proc_table, LT_INT_TO_POINTER(pid)); if (psargs == NULL) { psargs = lt_get_proc_field(pid, LT_FIELD_PSARGS); if (psargs == NULL) { psargs = lt_get_proc_field(pid, LT_FIELD_FNAME); } if (psargs == NULL) { return; } g_hash_table_insert(proc_table, LT_INT_TO_POINTER(pid), psargs); } str_len = strlen(stack) + 20; str = lt_malloc(str_len); (void) snprintf(str, str_len, "%ld, \"%s\"", pid, stack); entry = (lt_stat_data_t *)g_hash_table_lookup(klog_table, str); if (entry == NULL) { entry = (lt_stat_data_t *)lt_zalloc(sizeof (lt_stat_data_t)); g_hash_table_insert(klog_table, str, entry); } else { free(str); } lt_update_stat_value(entry, type, value); }