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14 * in the LICENSE file that accompanied this code).
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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36 * Author: Eric Barton <eeb@clusterfs.com>
40 # define EXPORT_SYMTAB
43 #define DEBUG_SUBSYSTEM S_LNET
45 #include <libcfs/libcfs.h>
51 lwt_cpu_t lwt_cpus[CFS_NR_CPUS];
54 int lwt_pages_per_cpu;
56 /* NB only root is allowed to retrieve LWT info; it's an open door into the
60 lwt_lookup_string (int *size, char *knl_ptr,
61 char *user_ptr, int user_size)
65 /* knl_ptr was retrieved from an LWT snapshot and the caller wants to
66 * turn it into a string. NB we can crash with an access violation
67 * trying to determine the string length, so we're trusting our
70 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
77 *size = strnlen (knl_ptr, maxsize - 1) + 1;
79 if (user_ptr != NULL) {
83 if (cfs_copy_to_user (user_ptr, knl_ptr, *size))
86 /* Did I truncate the string? */
87 if (knl_ptr[*size - 1] != 0)
88 cfs_copy_to_user (user_ptr + *size - 4, "...", 4);
95 lwt_control (int enable, int clear)
101 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
108 /* give people some time to stop adding traces */
109 cfs_schedule_timeout(10);
112 for (i = 0; i < cfs_num_online_cpus(); i++) {
113 p = lwt_cpus[i].lwtc_current_page;
121 for (j = 0; j < lwt_pages_per_cpu; j++) {
122 memset (p->lwtp_events, 0, CFS_PAGE_SIZE);
124 p = cfs_list_entry (p->lwtp_list.next,
125 lwt_page_t, lwtp_list);
139 lwt_snapshot (cfs_cycles_t *now, int *ncpu, int *total_size,
140 void *user_ptr, int user_size)
142 const int events_per_page = CFS_PAGE_SIZE / sizeof(lwt_event_t);
143 const int bytes_per_page = events_per_page * sizeof(lwt_event_t);
148 if (!cfs_capable(CFS_CAP_SYS_ADMIN))
151 *ncpu = cfs_num_online_cpus();
152 *total_size = cfs_num_online_cpus() * lwt_pages_per_cpu *
156 if (user_ptr == NULL)
159 for (i = 0; i < cfs_num_online_cpus(); i++) {
160 p = lwt_cpus[i].lwtc_current_page;
165 for (j = 0; j < lwt_pages_per_cpu; j++) {
166 if (cfs_copy_to_user(user_ptr, p->lwtp_events,
170 user_ptr = ((char *)user_ptr) + bytes_per_page;
171 p = cfs_list_entry(p->lwtp_list.next,
172 lwt_page_t, lwtp_list);
185 for (i = 0; i < cfs_num_online_cpus(); i++)
186 if (lwt_cpus[i].lwtc_current_page != NULL)
189 LASSERT (!lwt_enabled);
191 /* NULL pointers, zero scalars */
192 memset (lwt_cpus, 0, sizeof (lwt_cpus));
194 LWT_MEMORY / (cfs_num_online_cpus() * CFS_PAGE_SIZE);
196 for (i = 0; i < cfs_num_online_cpus(); i++)
197 for (j = 0; j < lwt_pages_per_cpu; j++) {
198 struct page *page = alloc_page (GFP_KERNEL);
202 CERROR ("Can't allocate page\n");
207 LIBCFS_ALLOC(lwtp, sizeof (*lwtp));
209 CERROR ("Can't allocate lwtp\n");
215 lwtp->lwtp_page = page;
216 lwtp->lwtp_events = page_address(page);
217 memset (lwtp->lwtp_events, 0, CFS_PAGE_SIZE);
220 CFS_INIT_LIST_HEAD (&lwtp->lwtp_list);
221 lwt_cpus[i].lwtc_current_page = lwtp;
223 cfs_list_add (&lwtp->lwtp_list,
224 &lwt_cpus[i].lwtc_current_page->lwtp_list);
243 for (i = 0; i < cfs_num_online_cpus(); i++)
244 while (lwt_cpus[i].lwtc_current_page != NULL) {
245 lwt_page_t *lwtp = lwt_cpus[i].lwtc_current_page;
247 if (cfs_list_empty (&lwtp->lwtp_list)) {
248 lwt_cpus[i].lwtc_current_page = NULL;
250 lwt_cpus[i].lwtc_current_page =
251 cfs_list_entry (lwtp->lwtp_list.next,
252 lwt_page_t, lwtp_list);
254 cfs_list_del (&lwtp->lwtp_list);
257 __free_page (lwtp->lwtp_page);
258 LIBCFS_FREE (lwtp, sizeof (*lwtp));
262 EXPORT_SYMBOL(lwt_enabled);
263 EXPORT_SYMBOL(lwt_cpus);
265 EXPORT_SYMBOL(lwt_init);
266 EXPORT_SYMBOL(lwt_fini);
267 EXPORT_SYMBOL(lwt_lookup_string);
268 EXPORT_SYMBOL(lwt_control);
269 EXPORT_SYMBOL(lwt_snapshot);