diff options
Diffstat (limited to 'cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c')
| -rw-r--r-- | cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c | 341 |
1 files changed, 0 insertions, 341 deletions
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c b/cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c deleted file mode 100644 index 3eb76a0..0000000 --- a/cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c +++ /dev/null @@ -1,341 +0,0 @@ -/* - * 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 2008 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#pragma ident "%Z%%M% %I% %E% SMI" - -#include <sys/types.h> -#include <sys/param.h> -#include <sys/stat.h> -#include <sys/open.h> -#include <sys/file.h> -#include <sys/conf.h> -#include <sys/modctl.h> -#include <sys/cmn_err.h> -#include <sys/bitmap.h> -#include <sys/debug.h> -#include <sys/kmem.h> -#include <sys/errno.h> -#include <sys/sysmacros.h> -#include <sys/lockstat.h> -#include <sys/atomic.h> -#include <sys/dtrace.h> - -#include <sys/ddi.h> -#include <sys/sunddi.h> - -typedef struct lockstat_probe { - const char *lsp_func; - const char *lsp_name; - int lsp_probe; - dtrace_id_t lsp_id; -} lockstat_probe_t; - -lockstat_probe_t lockstat_probes[] = -{ - { LS_MUTEX_ENTER, LSA_ACQUIRE, LS_MUTEX_ENTER_ACQUIRE }, - { LS_MUTEX_ENTER, LSA_BLOCK, LS_MUTEX_ENTER_BLOCK }, - { LS_MUTEX_ENTER, LSA_SPIN, LS_MUTEX_ENTER_SPIN }, - { LS_MUTEX_EXIT, LSA_RELEASE, LS_MUTEX_EXIT_RELEASE }, - { LS_MUTEX_DESTROY, LSA_RELEASE, LS_MUTEX_DESTROY_RELEASE }, - { LS_MUTEX_TRYENTER, LSA_ACQUIRE, LS_MUTEX_TRYENTER_ACQUIRE }, - { LS_LOCK_SET, LSS_ACQUIRE, LS_LOCK_SET_ACQUIRE }, - { LS_LOCK_SET, LSS_SPIN, LS_LOCK_SET_SPIN }, - { LS_LOCK_SET_SPL, LSS_ACQUIRE, LS_LOCK_SET_SPL_ACQUIRE }, - { LS_LOCK_SET_SPL, LSS_SPIN, LS_LOCK_SET_SPL_SPIN }, - { LS_LOCK_TRY, LSS_ACQUIRE, LS_LOCK_TRY_ACQUIRE }, - { LS_LOCK_CLEAR, LSS_RELEASE, LS_LOCK_CLEAR_RELEASE }, - { LS_LOCK_CLEAR_SPLX, LSS_RELEASE, LS_LOCK_CLEAR_SPLX_RELEASE }, - { LS_CLOCK_UNLOCK, LSS_RELEASE, LS_CLOCK_UNLOCK_RELEASE }, - { LS_RW_ENTER, LSR_ACQUIRE, LS_RW_ENTER_ACQUIRE }, - { LS_RW_ENTER, LSR_BLOCK, LS_RW_ENTER_BLOCK }, - { LS_RW_EXIT, LSR_RELEASE, LS_RW_EXIT_RELEASE }, - { LS_RW_TRYENTER, LSR_ACQUIRE, LS_RW_TRYENTER_ACQUIRE }, - { LS_RW_TRYUPGRADE, LSR_UPGRADE, LS_RW_TRYUPGRADE_UPGRADE }, - { LS_RW_DOWNGRADE, LSR_DOWNGRADE, LS_RW_DOWNGRADE_DOWNGRADE }, - { LS_THREAD_LOCK, LST_SPIN, LS_THREAD_LOCK_SPIN }, - { LS_THREAD_LOCK_HIGH, LST_SPIN, LS_THREAD_LOCK_HIGH_SPIN }, - { NULL } -}; - -static dev_info_t *lockstat_devi; /* saved in xxattach() for xxinfo() */ -static kmutex_t lockstat_test; /* for testing purposes only */ -static dtrace_provider_id_t lockstat_id; - -/*ARGSUSED*/ -static void -lockstat_enable(void *arg, dtrace_id_t id, void *parg) -{ - lockstat_probe_t *probe = parg; - - ASSERT(!lockstat_probemap[probe->lsp_probe]); - - lockstat_probemap[probe->lsp_probe] = id; - membar_producer(); - - lockstat_hot_patch(); - membar_producer(); - - /* - * Immediately generate a record for the lockstat_test mutex - * to verify that the mutex hot-patch code worked as expected. - */ - mutex_enter(&lockstat_test); - mutex_exit(&lockstat_test); -} - -/*ARGSUSED*/ -static void -lockstat_disable(void *arg, dtrace_id_t id, void *parg) -{ - lockstat_probe_t *probe = parg; - int i; - - ASSERT(lockstat_probemap[probe->lsp_probe]); - - lockstat_probemap[probe->lsp_probe] = 0; - lockstat_hot_patch(); - membar_producer(); - - /* - * See if we have any probes left enabled. - */ - for (i = 0; i < LS_NPROBES; i++) { - if (lockstat_probemap[i]) { - /* - * This probe is still enabled. We don't need to deal - * with waiting for all threads to be out of the - * lockstat critical sections; just return. - */ - return; - } - } - - /* - * The delay() here isn't as cheesy as you might think. We don't - * want to busy-loop in the kernel, so we have to give up the - * CPU between calls to lockstat_active_threads(); that much is - * obvious. But the reason it's a do..while loop rather than a - * while loop is subtle. The memory barrier above guarantees that - * no threads will enter the lockstat code from this point forward. - * However, another thread could already be executing lockstat code - * without our knowledge if the update to its t_lockstat field hasn't - * cleared its CPU's store buffer. Delaying for one clock tick - * guarantees that either (1) the thread will have *ample* time to - * complete its work, or (2) the thread will be preempted, in which - * case it will have to grab and release a dispatcher lock, which - * will flush that CPU's store buffer. Either way we're covered. - */ - do { - delay(1); - } while (lockstat_active_threads()); -} - -/*ARGSUSED*/ -static int -lockstat_open(dev_t *devp, int flag, int otyp, cred_t *cred_p) -{ - return (0); -} - -/* ARGSUSED */ -static int -lockstat_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) -{ - int error; - - switch (infocmd) { - case DDI_INFO_DEVT2DEVINFO: - *result = (void *) lockstat_devi; - error = DDI_SUCCESS; - break; - case DDI_INFO_DEVT2INSTANCE: - *result = (void *)0; - error = DDI_SUCCESS; - break; - default: - error = DDI_FAILURE; - } - return (error); -} - -/*ARGSUSED*/ -static void -lockstat_provide(void *arg, const dtrace_probedesc_t *desc) -{ - int i = 0; - - for (i = 0; lockstat_probes[i].lsp_func != NULL; i++) { - lockstat_probe_t *probe = &lockstat_probes[i]; - - if (dtrace_probe_lookup(lockstat_id, "genunix", - probe->lsp_func, probe->lsp_name) != 0) - continue; - - ASSERT(!probe->lsp_id); - probe->lsp_id = dtrace_probe_create(lockstat_id, - "genunix", probe->lsp_func, probe->lsp_name, - 1, probe); - } -} - -/*ARGSUSED*/ -static void -lockstat_destroy(void *arg, dtrace_id_t id, void *parg) -{ - lockstat_probe_t *probe = parg; - - ASSERT(!lockstat_probemap[probe->lsp_probe]); - probe->lsp_id = 0; -} - -static dtrace_pattr_t lockstat_attr = { -{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON }, -{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, -{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN }, -{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON }, -{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON }, -}; - -static dtrace_pops_t lockstat_pops = { - lockstat_provide, - NULL, - lockstat_enable, - lockstat_disable, - NULL, - NULL, - NULL, - NULL, - NULL, - lockstat_destroy -}; - -static int -lockstat_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) -{ - switch (cmd) { - case DDI_ATTACH: - break; - case DDI_RESUME: - return (DDI_SUCCESS); - default: - return (DDI_FAILURE); - } - - if (ddi_create_minor_node(devi, "lockstat", S_IFCHR, 0, - DDI_PSEUDO, 0) == DDI_FAILURE || - dtrace_register("lockstat", &lockstat_attr, DTRACE_PRIV_KERNEL, - NULL, &lockstat_pops, NULL, &lockstat_id) != 0) { - ddi_remove_minor_node(devi, NULL); - return (DDI_FAILURE); - } - - lockstat_probe = dtrace_probe; - membar_producer(); - - ddi_report_dev(devi); - lockstat_devi = devi; - return (DDI_SUCCESS); -} - -static int -lockstat_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) -{ - switch (cmd) { - case DDI_DETACH: - break; - case DDI_SUSPEND: - return (DDI_SUCCESS); - default: - return (DDI_FAILURE); - } - - if (dtrace_unregister(lockstat_id) != 0) - return (DDI_FAILURE); - - ddi_remove_minor_node(devi, NULL); - return (DDI_SUCCESS); -} - -/* - * Configuration data structures - */ -static struct cb_ops lockstat_cb_ops = { - lockstat_open, /* open */ - nodev, /* close */ - nulldev, /* strategy */ - nulldev, /* print */ - nodev, /* dump */ - nodev, /* read */ - nodev, /* write */ - nodev, /* ioctl */ - nodev, /* devmap */ - nodev, /* mmap */ - nodev, /* segmap */ - nochpoll, /* poll */ - ddi_prop_op, /* cb_prop_op */ - 0, /* streamtab */ - D_MP | D_NEW /* Driver compatibility flag */ -}; - -static struct dev_ops lockstat_ops = { - DEVO_REV, /* devo_rev, */ - 0, /* refcnt */ - lockstat_info, /* getinfo */ - nulldev, /* identify */ - nulldev, /* probe */ - lockstat_attach, /* attach */ - lockstat_detach, /* detach */ - nulldev, /* reset */ - &lockstat_cb_ops, /* cb_ops */ - NULL, /* bus_ops */ -}; - -static struct modldrv modldrv = { - &mod_driverops, /* Type of module. This one is a driver */ - "Lock Statistics %I%", /* name of module */ - &lockstat_ops, /* driver ops */ -}; - -static struct modlinkage modlinkage = { - MODREV_1, (void *)&modldrv, NULL -}; - -int -_init(void) -{ - return (mod_install(&modlinkage)); -} - -int -_fini(void) -{ - return (mod_remove(&modlinkage)); -} - -int -_info(struct modinfo *modinfop) -{ - return (mod_info(&modlinkage, modinfop)); -} |
