1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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38 * Author: Eric Barton <eeb@clusterfs.com>
42 # define EXPORT_SYMTAB
45 #define DEBUG_SUBSYSTEM S_LNET
47 #include <libcfs/libcfs.h>
53 lwt_cpu_t lwt_cpus[CFS_NR_CPUS];
56 int lwt_pages_per_cpu;
58 /* NB only root is allowed to retrieve LWT info; it's an open door into the
62 lwt_lookup_string (int *size, char *knl_ptr,
63 char *user_ptr, int user_size)
67 /* knl_ptr was retrieved from an LWT snapshot and the caller wants to
68 * turn it into a string. NB we can crash with an access violation
69 * trying to determine the string length, so we're trusting our
72 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
79 *size = strnlen (knl_ptr, maxsize - 1) + 1;
81 if (user_ptr != NULL) {
85 if (cfs_copy_to_user (user_ptr, knl_ptr, *size))
88 /* Did I truncate the string? */
89 if (knl_ptr[*size - 1] != 0)
90 cfs_copy_to_user (user_ptr + *size - 4, "...", 4);
97 lwt_control (int enable, int clear)
103 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
110 /* give people some time to stop adding traces */
111 cfs_schedule_timeout(10);
114 for (i = 0; i < cfs_num_online_cpus(); i++) {
115 p = lwt_cpus[i].lwtc_current_page;
123 for (j = 0; j < lwt_pages_per_cpu; j++) {
124 memset (p->lwtp_events, 0, CFS_PAGE_SIZE);
126 p = cfs_list_entry (p->lwtp_list.next,
127 lwt_page_t, lwtp_list);
141 lwt_snapshot (cfs_cycles_t *now, int *ncpu, int *total_size,
142 void *user_ptr, int user_size)
144 const int events_per_page = CFS_PAGE_SIZE / sizeof(lwt_event_t);
145 const int bytes_per_page = events_per_page * sizeof(lwt_event_t);
150 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
153 *ncpu = cfs_num_online_cpus();
154 *total_size = cfs_num_online_cpus() * lwt_pages_per_cpu *
158 if (user_ptr == NULL)
161 for (i = 0; i < cfs_num_online_cpus(); i++) {
162 p = lwt_cpus[i].lwtc_current_page;
167 for (j = 0; j < lwt_pages_per_cpu; j++) {
168 if (cfs_copy_to_user(user_ptr, p->lwtp_events,
172 user_ptr = ((char *)user_ptr) + bytes_per_page;
173 p = cfs_list_entry(p->lwtp_list.next,
174 lwt_page_t, lwtp_list);
187 for (i = 0; i < cfs_num_online_cpus(); i++)
188 if (lwt_cpus[i].lwtc_current_page != NULL)
191 LASSERT (!lwt_enabled);
193 /* NULL pointers, zero scalars */
194 memset (lwt_cpus, 0, sizeof (lwt_cpus));
196 LWT_MEMORY / (cfs_num_online_cpus() * CFS_PAGE_SIZE);
198 for (i = 0; i < cfs_num_online_cpus(); i++)
199 for (j = 0; j < lwt_pages_per_cpu; j++) {
200 struct page *page = alloc_page (GFP_KERNEL);
204 CERROR ("Can't allocate page\n");
209 LIBCFS_ALLOC(lwtp, sizeof (*lwtp));
211 CERROR ("Can't allocate lwtp\n");
217 lwtp->lwtp_page = page;
218 lwtp->lwtp_events = page_address(page);
219 memset (lwtp->lwtp_events, 0, CFS_PAGE_SIZE);
222 CFS_INIT_LIST_HEAD (&lwtp->lwtp_list);
223 lwt_cpus[i].lwtc_current_page = lwtp;
225 cfs_list_add (&lwtp->lwtp_list,
226 &lwt_cpus[i].lwtc_current_page->lwtp_list);
245 for (i = 0; i < cfs_num_online_cpus(); i++)
246 while (lwt_cpus[i].lwtc_current_page != NULL) {
247 lwt_page_t *lwtp = lwt_cpus[i].lwtc_current_page;
249 if (cfs_list_empty (&lwtp->lwtp_list)) {
250 lwt_cpus[i].lwtc_current_page = NULL;
252 lwt_cpus[i].lwtc_current_page =
253 cfs_list_entry (lwtp->lwtp_list.next,
254 lwt_page_t, lwtp_list);
256 cfs_list_del (&lwtp->lwtp_list);
259 __free_page (lwtp->lwtp_page);
260 LIBCFS_FREE (lwtp, sizeof (*lwtp));
264 EXPORT_SYMBOL(lwt_enabled);
265 EXPORT_SYMBOL(lwt_cpus);
267 EXPORT_SYMBOL(lwt_init);
268 EXPORT_SYMBOL(lwt_fini);
269 EXPORT_SYMBOL(lwt_lookup_string);
270 EXPORT_SYMBOL(lwt_control);
271 EXPORT_SYMBOL(lwt_snapshot);