-/*
- * GPL HEADER START
- *
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License version 2 for more details (a copy is included
- * in the LICENSE file that accompanied this code).
- *
- * You should have received a copy of the GNU General Public License
- * version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
- *
- * GPL HEADER END
- */
-/*
- * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
- * Use is subject to license terms.
- */
-/*
- * This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
- *
- * lustre/obdclass/lu_time.c
- *
- * Lustre Time Tracking.
- * These are the only exported functions, they provide some generic
- * infrastructure for managing object devices.
- *
- * Author: Nikita Danilov <nikita@clusterfs.com>
- */
-
-#define DEBUG_SUBSYSTEM S_CLASS
-
-#include <obd_class.h>
-/* OBD_{ALLOC,FREE}_PTR() */
-#include <obd_support.h>
-#include <lprocfs_status.h>
-#include <lu_object.h>
-#include <lu_time.h>
-
-enum {
- LU_TIME_DEPTH_MAX = 16
-};
-
-struct lu_time_data {
- int ltd_tos; /* top of the stack */
- unsigned long long ltd_timestamp[LU_TIME_DEPTH_MAX];
-};
-
-/* context key constructor/destructor: lu_time_key_init, lu_time_key_fini */
-LU_KEY_INIT_FINI(lu_time, struct lu_time_data);
-
-void lu_time_key_exit(const struct lu_context *ctx,
- struct lu_context_key *key, void *data)
-{
- struct lu_time_data *value = data;
- LASSERT(value->ltd_tos == 0);
-}
-
-/*
- * Key, holding temporary buffer. This key is registered very early by
- * lu_global_init().
- */
-static struct lu_context_key lu_time_key = {
- .lct_tags = LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD,
- .lct_init = lu_time_key_init,
- .lct_fini = lu_time_key_fini,
- .lct_exit = lu_time_key_exit
-};
-
-int lu_time_global_init(void)
-{
- LU_CONTEXT_KEY_INIT(&lu_time_key);
- return lu_context_key_register(&lu_time_key);
-}
-
-void lu_time_global_fini(void)
-{
- lu_context_key_degister(&lu_time_key);
-}
-
-int lu_time_named_init(struct lprocfs_stats **stats, const char *name,
- cfs_proc_dir_entry_t *entry,
- const char **names, int nr)
-{
- int result;
- int i;
-
- ENTRY;
-
- *stats = NULL;
- if (nr == 0)
- RETURN(0);
-
- *stats = lprocfs_alloc_stats(nr, 0);
- if (*stats != NULL) {
- result = lprocfs_register_stats(entry, name, *stats);
- if (result == 0) {
- for (i = 0; i < nr; ++i) {
- lprocfs_counter_init(*stats, i,
- LPROCFS_CNTR_AVGMINMAX,
- names[i], "usec");
- }
- }
- } else
- result = -ENOMEM;
-
- if (result != 0)
- lu_time_fini(stats);
-
- RETURN(result);
-}
-EXPORT_SYMBOL(lu_time_named_init);
-
-int lu_time_init(struct lprocfs_stats **stats, cfs_proc_dir_entry_t *entry,
- const char **names, int nr)
-{
- return lu_time_named_init(stats, "lu_stats", entry, names, nr);
-}
-EXPORT_SYMBOL(lu_time_init);
-
-void lu_time_fini(struct lprocfs_stats **stats)
-{
- if (*stats != NULL) {
- lprocfs_free_stats(stats);
- *stats = NULL;
- }
-}
-EXPORT_SYMBOL(lu_time_fini);
-
-static inline struct lu_time_data *lu_time_data_get(const struct lu_env *env)
-{
- return lu_context_key_get(&env->le_ctx, &lu_time_key);
-}
-
-int lu_time_is_clean(const struct lu_env *env)
-{
- return lu_time_data_get(env)->ltd_tos == 0;
-}
-EXPORT_SYMBOL(lu_time_is_clean);
-
-/* from sleepometer by Andrew Morton */
-unsigned long long lu_time_stamp_get(void)
-{
- /*
- * Return timestamp with microsecond precision. This has to be cheap.
- */
-//#ifdef CONFIG_X86
-#if defined(CONFIG_X86) && !defined(CONFIG_X86_64)
- /*
- * do_gettimeofday() goes backwards sometimes :(. Usethe TSC
- */
- unsigned long long ret;
-
- rdtscll(ret);
- do_div(ret, cpu_khz / 1000);
- return ret;
-#else
- struct timeval now;
- unsigned long long ret;
-
- cfs_gettimeofday(&now);
- ret = now.tv_sec;
- ret *= 1000000;
- ret += now.tv_usec;
- return ret;
-#endif
-}
-/*
- * Export it, but do not advertise in headers. This is limited use only.
- */
-EXPORT_SYMBOL(lu_time_stamp_get);
-
-void lu_lprocfs_time_start(const struct lu_env *env)
-{
- struct lu_time_data *ltd = lu_time_data_get(env);
-
- LASSERT(0 <= ltd->ltd_tos);
- LASSERT(ltd->ltd_tos < ARRAY_SIZE(ltd->ltd_timestamp));
- ltd->ltd_timestamp[ltd->ltd_tos++] = lu_time_stamp_get();
-}
-EXPORT_SYMBOL(lu_lprocfs_time_start);
-
-void lu_lprocfs_time_end(const struct lu_env *env,
- struct lprocfs_stats *stats, int idx)
-{
- struct lu_time_data *ltd = lu_time_data_get(env);
- long long diff;
-
- --ltd->ltd_tos;
- LASSERT(0 <= ltd->ltd_tos);
- LASSERT(ltd->ltd_tos < ARRAY_SIZE(ltd->ltd_timestamp));
- diff = lu_time_stamp_get() - ltd->ltd_timestamp[ltd->ltd_tos];
- if (diff >= 0 && stats != NULL)
- lprocfs_counter_add(stats, idx, diff);
-}
-EXPORT_SYMBOL(lu_lprocfs_time_end);
git://git.whamcloud.com / fs / lustre-release.git / commitdiff