Blame view
kernel/profile.c
15.9 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
/* * linux/kernel/profile.c * Simple profiling. Manages a direct-mapped profile hit count buffer, * with configurable resolution, support for restricting the cpus on * which profiling is done, and switching between cpu time and * schedule() calls via kernel command line parameters passed at boot. * * Scheduler profiling support, Arjan van de Ven and Ingo Molnar, * Red Hat, July 2004 * Consolidation of architecture support code for profiling, * William Irwin, Oracle, July 2004 * Amortized hit count accounting via per-cpu open-addressed hashtables * to resolve timer interrupt livelocks, William Irwin, Oracle, 2004 */ |
1da177e4c Linux-2.6.12-rc2 |
15 16 17 18 19 20 21 |
#include <linux/module.h> #include <linux/profile.h> #include <linux/bootmem.h> #include <linux/notifier.h> #include <linux/mm.h> #include <linux/cpumask.h> #include <linux/cpu.h> |
1da177e4c Linux-2.6.12-rc2 |
22 |
#include <linux/highmem.h> |
97d1f15b7 [PATCH] sem2mutex... |
23 |
#include <linux/mutex.h> |
1da177e4c Linux-2.6.12-rc2 |
24 |
#include <asm/sections.h> |
7d12e780e IRQ: Maintain reg... |
25 |
#include <asm/irq_regs.h> |
e8edc6e03 Detach sched.h fr... |
26 |
#include <asm/ptrace.h> |
1da177e4c Linux-2.6.12-rc2 |
27 28 29 30 31 32 33 34 35 36 |
struct profile_hit { u32 pc, hits; }; #define PROFILE_GRPSHIFT 3 #define PROFILE_GRPSZ (1 << PROFILE_GRPSHIFT) #define NR_PROFILE_HIT (PAGE_SIZE/sizeof(struct profile_hit)) #define NR_PROFILE_GRP (NR_PROFILE_HIT/PROFILE_GRPSZ) /* Oprofile timer tick hook */ |
b012d346c make kernel/profi... |
37 |
static int (*timer_hook)(struct pt_regs *) __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
38 39 40 |
static atomic_t *prof_buffer; static unsigned long prof_len, prof_shift; |
07031e14c [PATCH] KVM: add ... |
41 |
|
ece8a684c [PATCH] sleep pro... |
42 |
int prof_on __read_mostly; |
07031e14c [PATCH] KVM: add ... |
43 |
EXPORT_SYMBOL_GPL(prof_on); |
1da177e4c Linux-2.6.12-rc2 |
44 45 46 47 |
static cpumask_t prof_cpu_mask = CPU_MASK_ALL; #ifdef CONFIG_SMP static DEFINE_PER_CPU(struct profile_hit *[2], cpu_profile_hits); static DEFINE_PER_CPU(int, cpu_profile_flip); |
97d1f15b7 [PATCH] sem2mutex... |
48 |
static DEFINE_MUTEX(profile_flip_mutex); |
1da177e4c Linux-2.6.12-rc2 |
49 |
#endif /* CONFIG_SMP */ |
1ad82fd54 debug: clean up k... |
50 |
static int __init profile_setup(char *str) |
1da177e4c Linux-2.6.12-rc2 |
51 |
{ |
dfaa9c94b [PATCH] profile.c... |
52 |
static char __initdata schedstr[] = "schedule"; |
ece8a684c [PATCH] sleep pro... |
53 |
static char __initdata sleepstr[] = "sleep"; |
07031e14c [PATCH] KVM: add ... |
54 |
static char __initdata kvmstr[] = "kvm"; |
1da177e4c Linux-2.6.12-rc2 |
55 |
int par; |
ece8a684c [PATCH] sleep pro... |
56 |
if (!strncmp(str, sleepstr, strlen(sleepstr))) { |
b3da2a73f sched: document p... |
57 |
#ifdef CONFIG_SCHEDSTATS |
ece8a684c [PATCH] sleep pro... |
58 59 60 61 62 63 64 65 66 |
prof_on = SLEEP_PROFILING; if (str[strlen(sleepstr)] == ',') str += strlen(sleepstr) + 1; if (get_option(&str, &par)) prof_shift = par; printk(KERN_INFO "kernel sleep profiling enabled (shift: %ld) ", prof_shift); |
b3da2a73f sched: document p... |
67 68 69 70 71 |
#else printk(KERN_WARNING "kernel sleep profiling requires CONFIG_SCHEDSTATS "); #endif /* CONFIG_SCHEDSTATS */ |
a75acf850 [PATCH] profiling... |
72 |
} else if (!strncmp(str, schedstr, strlen(schedstr))) { |
1da177e4c Linux-2.6.12-rc2 |
73 |
prof_on = SCHED_PROFILING; |
dfaa9c94b [PATCH] profile.c... |
74 75 76 77 78 79 80 81 |
if (str[strlen(schedstr)] == ',') str += strlen(schedstr) + 1; if (get_option(&str, &par)) prof_shift = par; printk(KERN_INFO "kernel schedule profiling enabled (shift: %ld) ", prof_shift); |
07031e14c [PATCH] KVM: add ... |
82 83 84 85 86 87 88 89 90 91 |
} else if (!strncmp(str, kvmstr, strlen(kvmstr))) { prof_on = KVM_PROFILING; if (str[strlen(kvmstr)] == ',') str += strlen(kvmstr) + 1; if (get_option(&str, &par)) prof_shift = par; printk(KERN_INFO "kernel KVM profiling enabled (shift: %ld) ", prof_shift); |
dfaa9c94b [PATCH] profile.c... |
92 |
} else if (get_option(&str, &par)) { |
1da177e4c Linux-2.6.12-rc2 |
93 94 95 96 97 98 99 100 101 102 103 104 105 |
prof_shift = par; prof_on = CPU_PROFILING; printk(KERN_INFO "kernel profiling enabled (shift: %ld) ", prof_shift); } return 1; } __setup("profile=", profile_setup); void __init profile_init(void) { |
1ad82fd54 debug: clean up k... |
106 |
if (!prof_on) |
1da177e4c Linux-2.6.12-rc2 |
107 |
return; |
1ad82fd54 debug: clean up k... |
108 |
|
1da177e4c Linux-2.6.12-rc2 |
109 110 111 112 113 114 |
/* only text is profiled */ prof_len = (_etext - _stext) >> prof_shift; prof_buffer = alloc_bootmem(prof_len*sizeof(atomic_t)); } /* Profile event notifications */ |
1ad82fd54 debug: clean up k... |
115 |
|
1da177e4c Linux-2.6.12-rc2 |
116 |
#ifdef CONFIG_PROFILING |
1ad82fd54 debug: clean up k... |
117 |
|
e041c6834 [PATCH] Notifier ... |
118 119 120 |
static BLOCKING_NOTIFIER_HEAD(task_exit_notifier); static ATOMIC_NOTIFIER_HEAD(task_free_notifier); static BLOCKING_NOTIFIER_HEAD(munmap_notifier); |
1ad82fd54 debug: clean up k... |
121 122 |
void profile_task_exit(struct task_struct *task) |
1da177e4c Linux-2.6.12-rc2 |
123 |
{ |
e041c6834 [PATCH] Notifier ... |
124 |
blocking_notifier_call_chain(&task_exit_notifier, 0, task); |
1da177e4c Linux-2.6.12-rc2 |
125 |
} |
1ad82fd54 debug: clean up k... |
126 127 |
int profile_handoff_task(struct task_struct *task) |
1da177e4c Linux-2.6.12-rc2 |
128 129 |
{ int ret; |
e041c6834 [PATCH] Notifier ... |
130 |
ret = atomic_notifier_call_chain(&task_free_notifier, 0, task); |
1da177e4c Linux-2.6.12-rc2 |
131 132 133 134 135 |
return (ret == NOTIFY_OK) ? 1 : 0; } void profile_munmap(unsigned long addr) { |
e041c6834 [PATCH] Notifier ... |
136 |
blocking_notifier_call_chain(&munmap_notifier, 0, (void *)addr); |
1da177e4c Linux-2.6.12-rc2 |
137 |
} |
1ad82fd54 debug: clean up k... |
138 |
int task_handoff_register(struct notifier_block *n) |
1da177e4c Linux-2.6.12-rc2 |
139 |
{ |
e041c6834 [PATCH] Notifier ... |
140 |
return atomic_notifier_chain_register(&task_free_notifier, n); |
1da177e4c Linux-2.6.12-rc2 |
141 |
} |
1ad82fd54 debug: clean up k... |
142 |
EXPORT_SYMBOL_GPL(task_handoff_register); |
1da177e4c Linux-2.6.12-rc2 |
143 |
|
1ad82fd54 debug: clean up k... |
144 |
int task_handoff_unregister(struct notifier_block *n) |
1da177e4c Linux-2.6.12-rc2 |
145 |
{ |
e041c6834 [PATCH] Notifier ... |
146 |
return atomic_notifier_chain_unregister(&task_free_notifier, n); |
1da177e4c Linux-2.6.12-rc2 |
147 |
} |
1ad82fd54 debug: clean up k... |
148 |
EXPORT_SYMBOL_GPL(task_handoff_unregister); |
1da177e4c Linux-2.6.12-rc2 |
149 |
|
1ad82fd54 debug: clean up k... |
150 |
int profile_event_register(enum profile_type type, struct notifier_block *n) |
1da177e4c Linux-2.6.12-rc2 |
151 152 |
{ int err = -EINVAL; |
1ad82fd54 debug: clean up k... |
153 |
|
1da177e4c Linux-2.6.12-rc2 |
154 |
switch (type) { |
1ad82fd54 debug: clean up k... |
155 156 157 158 159 160 161 162 |
case PROFILE_TASK_EXIT: err = blocking_notifier_chain_register( &task_exit_notifier, n); break; case PROFILE_MUNMAP: err = blocking_notifier_chain_register( &munmap_notifier, n); break; |
1da177e4c Linux-2.6.12-rc2 |
163 |
} |
1ad82fd54 debug: clean up k... |
164 |
|
1da177e4c Linux-2.6.12-rc2 |
165 166 |
return err; } |
1ad82fd54 debug: clean up k... |
167 |
EXPORT_SYMBOL_GPL(profile_event_register); |
1da177e4c Linux-2.6.12-rc2 |
168 |
|
1ad82fd54 debug: clean up k... |
169 |
int profile_event_unregister(enum profile_type type, struct notifier_block *n) |
1da177e4c Linux-2.6.12-rc2 |
170 171 |
{ int err = -EINVAL; |
1ad82fd54 debug: clean up k... |
172 |
|
1da177e4c Linux-2.6.12-rc2 |
173 |
switch (type) { |
1ad82fd54 debug: clean up k... |
174 175 176 177 178 179 180 181 |
case PROFILE_TASK_EXIT: err = blocking_notifier_chain_unregister( &task_exit_notifier, n); break; case PROFILE_MUNMAP: err = blocking_notifier_chain_unregister( &munmap_notifier, n); break; |
1da177e4c Linux-2.6.12-rc2 |
182 |
} |
1da177e4c Linux-2.6.12-rc2 |
183 184 |
return err; } |
1ad82fd54 debug: clean up k... |
185 |
EXPORT_SYMBOL_GPL(profile_event_unregister); |
1da177e4c Linux-2.6.12-rc2 |
186 187 188 189 190 191 192 193 |
int register_timer_hook(int (*hook)(struct pt_regs *)) { if (timer_hook) return -EBUSY; timer_hook = hook; return 0; } |
1ad82fd54 debug: clean up k... |
194 |
EXPORT_SYMBOL_GPL(register_timer_hook); |
1da177e4c Linux-2.6.12-rc2 |
195 196 197 198 199 200 |
void unregister_timer_hook(int (*hook)(struct pt_regs *)) { WARN_ON(hook != timer_hook); timer_hook = NULL; /* make sure all CPUs see the NULL hook */ |
fbd568a3e [PATCH] Change sy... |
201 |
synchronize_sched(); /* Allow ongoing interrupts to complete. */ |
1da177e4c Linux-2.6.12-rc2 |
202 |
} |
1da177e4c Linux-2.6.12-rc2 |
203 |
EXPORT_SYMBOL_GPL(unregister_timer_hook); |
1da177e4c Linux-2.6.12-rc2 |
204 205 |
#endif /* CONFIG_PROFILING */ |
1da177e4c Linux-2.6.12-rc2 |
206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 |
#ifdef CONFIG_SMP /* * Each cpu has a pair of open-addressed hashtables for pending * profile hits. read_profile() IPI's all cpus to request them * to flip buffers and flushes their contents to prof_buffer itself. * Flip requests are serialized by the profile_flip_mutex. The sole * use of having a second hashtable is for avoiding cacheline * contention that would otherwise happen during flushes of pending * profile hits required for the accuracy of reported profile hits * and so resurrect the interrupt livelock issue. * * The open-addressed hashtables are indexed by profile buffer slot * and hold the number of pending hits to that profile buffer slot on * a cpu in an entry. When the hashtable overflows, all pending hits * are accounted to their corresponding profile buffer slots with * atomic_add() and the hashtable emptied. As numerous pending hits * may be accounted to a profile buffer slot in a hashtable entry, * this amortizes a number of atomic profile buffer increments likely * to be far larger than the number of entries in the hashtable, * particularly given that the number of distinct profile buffer * positions to which hits are accounted during short intervals (e.g. * several seconds) is usually very small. Exclusion from buffer * flipping is provided by interrupt disablement (note that for |
ece8a684c [PATCH] sleep pro... |
230 231 |
* SCHED_PROFILING or SLEEP_PROFILING profile_hit() may be called from * process context). |
1da177e4c Linux-2.6.12-rc2 |
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 |
* The hash function is meant to be lightweight as opposed to strong, * and was vaguely inspired by ppc64 firmware-supported inverted * pagetable hash functions, but uses a full hashtable full of finite * collision chains, not just pairs of them. * * -- wli */ static void __profile_flip_buffers(void *unused) { int cpu = smp_processor_id(); per_cpu(cpu_profile_flip, cpu) = !per_cpu(cpu_profile_flip, cpu); } static void profile_flip_buffers(void) { int i, j, cpu; |
97d1f15b7 [PATCH] sem2mutex... |
249 |
mutex_lock(&profile_flip_mutex); |
1da177e4c Linux-2.6.12-rc2 |
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 |
j = per_cpu(cpu_profile_flip, get_cpu()); put_cpu(); on_each_cpu(__profile_flip_buffers, NULL, 0, 1); for_each_online_cpu(cpu) { struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[j]; for (i = 0; i < NR_PROFILE_HIT; ++i) { if (!hits[i].hits) { if (hits[i].pc) hits[i].pc = 0; continue; } atomic_add(hits[i].hits, &prof_buffer[hits[i].pc]); hits[i].hits = hits[i].pc = 0; } } |
97d1f15b7 [PATCH] sem2mutex... |
265 |
mutex_unlock(&profile_flip_mutex); |
1da177e4c Linux-2.6.12-rc2 |
266 267 268 269 270 |
} static void profile_discard_flip_buffers(void) { int i, cpu; |
97d1f15b7 [PATCH] sem2mutex... |
271 |
mutex_lock(&profile_flip_mutex); |
1da177e4c Linux-2.6.12-rc2 |
272 273 274 275 276 277 278 |
i = per_cpu(cpu_profile_flip, get_cpu()); put_cpu(); on_each_cpu(__profile_flip_buffers, NULL, 0, 1); for_each_online_cpu(cpu) { struct profile_hit *hits = per_cpu(cpu_profile_hits, cpu)[i]; memset(hits, 0, NR_PROFILE_HIT*sizeof(struct profile_hit)); } |
97d1f15b7 [PATCH] sem2mutex... |
279 |
mutex_unlock(&profile_flip_mutex); |
1da177e4c Linux-2.6.12-rc2 |
280 |
} |
ece8a684c [PATCH] sleep pro... |
281 |
void profile_hits(int type, void *__pc, unsigned int nr_hits) |
1da177e4c Linux-2.6.12-rc2 |
282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 |
{ unsigned long primary, secondary, flags, pc = (unsigned long)__pc; int i, j, cpu; struct profile_hit *hits; if (prof_on != type || !prof_buffer) return; pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1); i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT; secondary = (~(pc << 1) & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT; cpu = get_cpu(); hits = per_cpu(cpu_profile_hits, cpu)[per_cpu(cpu_profile_flip, cpu)]; if (!hits) { put_cpu(); return; } |
ece8a684c [PATCH] sleep pro... |
298 299 300 301 302 |
/* * We buffer the global profiler buffer into a per-CPU * queue and thus reduce the number of global (and possibly * NUMA-alien) accesses. The write-queue is self-coalescing: */ |
1da177e4c Linux-2.6.12-rc2 |
303 304 305 306 |
local_irq_save(flags); do { for (j = 0; j < PROFILE_GRPSZ; ++j) { if (hits[i + j].pc == pc) { |
ece8a684c [PATCH] sleep pro... |
307 |
hits[i + j].hits += nr_hits; |
1da177e4c Linux-2.6.12-rc2 |
308 309 310 |
goto out; } else if (!hits[i + j].hits) { hits[i + j].pc = pc; |
ece8a684c [PATCH] sleep pro... |
311 |
hits[i + j].hits = nr_hits; |
1da177e4c Linux-2.6.12-rc2 |
312 313 314 315 316 |
goto out; } } i = (i + secondary) & (NR_PROFILE_HIT - 1); } while (i != primary); |
ece8a684c [PATCH] sleep pro... |
317 318 319 320 321 322 |
/* * Add the current hit(s) and flush the write-queue out * to the global buffer: */ atomic_add(nr_hits, &prof_buffer[pc]); |
1da177e4c Linux-2.6.12-rc2 |
323 324 325 326 327 328 329 330 |
for (i = 0; i < NR_PROFILE_HIT; ++i) { atomic_add(hits[i].hits, &prof_buffer[hits[i].pc]); hits[i].pc = hits[i].hits = 0; } out: local_irq_restore(flags); put_cpu(); } |
9c7b216d2 [PATCH] cpu hotpl... |
331 |
static int __devinit profile_cpu_callback(struct notifier_block *info, |
1da177e4c Linux-2.6.12-rc2 |
332 333 334 335 336 337 338 |
unsigned long action, void *__cpu) { int node, cpu = (unsigned long)__cpu; struct page *page; switch (action) { case CPU_UP_PREPARE: |
8bb784428 Add suspend-relat... |
339 |
case CPU_UP_PREPARE_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
340 341 342 |
node = cpu_to_node(cpu); per_cpu(cpu_profile_flip, cpu) = 0; if (!per_cpu(cpu_profile_hits, cpu)[1]) { |
fbd98167e [PATCH] Profiling... |
343 |
page = alloc_pages_node(node, |
4199cfa02 Memoryless nodes:... |
344 |
GFP_KERNEL | __GFP_ZERO, |
fbd98167e [PATCH] Profiling... |
345 |
0); |
1da177e4c Linux-2.6.12-rc2 |
346 347 348 349 350 |
if (!page) return NOTIFY_BAD; per_cpu(cpu_profile_hits, cpu)[1] = page_address(page); } if (!per_cpu(cpu_profile_hits, cpu)[0]) { |
fbd98167e [PATCH] Profiling... |
351 |
page = alloc_pages_node(node, |
4199cfa02 Memoryless nodes:... |
352 |
GFP_KERNEL | __GFP_ZERO, |
fbd98167e [PATCH] Profiling... |
353 |
0); |
1da177e4c Linux-2.6.12-rc2 |
354 355 356 357 358 |
if (!page) goto out_free; per_cpu(cpu_profile_hits, cpu)[0] = page_address(page); } break; |
1ad82fd54 debug: clean up k... |
359 |
out_free: |
1da177e4c Linux-2.6.12-rc2 |
360 361 362 363 364 |
page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]); per_cpu(cpu_profile_hits, cpu)[1] = NULL; __free_page(page); return NOTIFY_BAD; case CPU_ONLINE: |
8bb784428 Add suspend-relat... |
365 |
case CPU_ONLINE_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
366 367 368 |
cpu_set(cpu, prof_cpu_mask); break; case CPU_UP_CANCELED: |
8bb784428 Add suspend-relat... |
369 |
case CPU_UP_CANCELED_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
370 |
case CPU_DEAD: |
8bb784428 Add suspend-relat... |
371 |
case CPU_DEAD_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 |
cpu_clear(cpu, prof_cpu_mask); if (per_cpu(cpu_profile_hits, cpu)[0]) { page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]); per_cpu(cpu_profile_hits, cpu)[0] = NULL; __free_page(page); } if (per_cpu(cpu_profile_hits, cpu)[1]) { page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]); per_cpu(cpu_profile_hits, cpu)[1] = NULL; __free_page(page); } break; } return NOTIFY_OK; } |
1da177e4c Linux-2.6.12-rc2 |
387 388 389 |
#else /* !CONFIG_SMP */ #define profile_flip_buffers() do { } while (0) #define profile_discard_flip_buffers() do { } while (0) |
023160678 [PATCH] hotplug C... |
390 |
#define profile_cpu_callback NULL |
1da177e4c Linux-2.6.12-rc2 |
391 |
|
ece8a684c [PATCH] sleep pro... |
392 |
void profile_hits(int type, void *__pc, unsigned int nr_hits) |
1da177e4c Linux-2.6.12-rc2 |
393 394 395 396 397 398 |
{ unsigned long pc; if (prof_on != type || !prof_buffer) return; pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift; |
ece8a684c [PATCH] sleep pro... |
399 |
atomic_add(nr_hits, &prof_buffer[min(pc, prof_len - 1)]); |
1da177e4c Linux-2.6.12-rc2 |
400 401 |
} #endif /* !CONFIG_SMP */ |
bbe1a59b3 [PATCH] fix "kvm:... |
402 |
EXPORT_SYMBOL_GPL(profile_hits); |
7d12e780e IRQ: Maintain reg... |
403 |
void profile_tick(int type) |
1da177e4c Linux-2.6.12-rc2 |
404 |
{ |
7d12e780e IRQ: Maintain reg... |
405 |
struct pt_regs *regs = get_irq_regs(); |
1da177e4c Linux-2.6.12-rc2 |
406 407 408 409 410 411 412 413 414 415 |
if (type == CPU_PROFILING && timer_hook) timer_hook(regs); if (!user_mode(regs) && cpu_isset(smp_processor_id(), prof_cpu_mask)) profile_hit(type, (void *)profile_pc(regs)); } #ifdef CONFIG_PROC_FS #include <linux/proc_fs.h> #include <asm/uaccess.h> #include <asm/ptrace.h> |
1ad82fd54 debug: clean up k... |
416 |
static int prof_cpu_mask_read_proc(char *page, char **start, off_t off, |
1da177e4c Linux-2.6.12-rc2 |
417 418 419 420 421 422 423 424 425 |
int count, int *eof, void *data) { int len = cpumask_scnprintf(page, count, *(cpumask_t *)data); if (count - len < 2) return -EINVAL; len += sprintf(page + len, " "); return len; } |
1ad82fd54 debug: clean up k... |
426 427 |
static int prof_cpu_mask_write_proc(struct file *file, const char __user *buffer, unsigned long count, void *data) |
1da177e4c Linux-2.6.12-rc2 |
428 429 430 431 |
{ cpumask_t *mask = (cpumask_t *)data; unsigned long full_count = count, err; cpumask_t new_value; |
01a3ee2b2 [PATCH] bitmap: p... |
432 |
err = cpumask_parse_user(buffer, count, new_value); |
1da177e4c Linux-2.6.12-rc2 |
433 434 435 436 437 438 439 440 441 442 443 444 |
if (err) return err; *mask = new_value; return full_count; } void create_prof_cpu_mask(struct proc_dir_entry *root_irq_dir) { struct proc_dir_entry *entry; /* create /proc/irq/prof_cpu_mask */ |
1ad82fd54 debug: clean up k... |
445 446 |
entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir); if (!entry) |
1da177e4c Linux-2.6.12-rc2 |
447 |
return; |
1da177e4c Linux-2.6.12-rc2 |
448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 |
entry->data = (void *)&prof_cpu_mask; entry->read_proc = prof_cpu_mask_read_proc; entry->write_proc = prof_cpu_mask_write_proc; } /* * This function accesses profiling information. The returned data is * binary: the sampling step and the actual contents of the profile * buffer. Use of the program readprofile is recommended in order to * get meaningful info out of these data. */ static ssize_t read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos) { unsigned long p = *ppos; ssize_t read; |
1ad82fd54 debug: clean up k... |
464 |
char *pnt; |
1da177e4c Linux-2.6.12-rc2 |
465 466 467 468 469 470 471 472 473 474 |
unsigned int sample_step = 1 << prof_shift; profile_flip_buffers(); if (p >= (prof_len+1)*sizeof(unsigned int)) return 0; if (count > (prof_len+1)*sizeof(unsigned int) - p) count = (prof_len+1)*sizeof(unsigned int) - p; read = 0; while (p < sizeof(unsigned int) && count > 0) { |
1ad82fd54 debug: clean up k... |
475 |
if (put_user(*((char *)(&sample_step)+p), buf)) |
064b022c7 [PATCH] profile: ... |
476 |
return -EFAULT; |
1da177e4c Linux-2.6.12-rc2 |
477 478 479 |
buf++; p++; count--; read++; } pnt = (char *)prof_buffer + p - sizeof(atomic_t); |
1ad82fd54 debug: clean up k... |
480 |
if (copy_to_user(buf, (void *)pnt, count)) |
1da177e4c Linux-2.6.12-rc2 |
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 |
return -EFAULT; read += count; *ppos += read; return read; } /* * Writing to /proc/profile resets the counters * * Writing a 'profiling multiplier' value into it also re-sets the profiling * interrupt frequency, on architectures that support this. */ static ssize_t write_profile(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { #ifdef CONFIG_SMP |
1ad82fd54 debug: clean up k... |
497 |
extern int setup_profiling_timer(unsigned int multiplier); |
1da177e4c Linux-2.6.12-rc2 |
498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 |
if (count == sizeof(int)) { unsigned int multiplier; if (copy_from_user(&multiplier, buf, sizeof(int))) return -EFAULT; if (setup_profiling_timer(multiplier)) return -EINVAL; } #endif profile_discard_flip_buffers(); memset(prof_buffer, 0, prof_len * sizeof(atomic_t)); return count; } |
15ad7cdcf [PATCH] struct se... |
513 |
static const struct file_operations proc_profile_operations = { |
1da177e4c Linux-2.6.12-rc2 |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 |
.read = read_profile, .write = write_profile, }; #ifdef CONFIG_SMP static void __init profile_nop(void *unused) { } static int __init create_hash_tables(void) { int cpu; for_each_online_cpu(cpu) { int node = cpu_to_node(cpu); struct page *page; |
fbd98167e [PATCH] Profiling... |
530 531 532 |
page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE, 0); |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 536 |
if (!page) goto out_cleanup; per_cpu(cpu_profile_hits, cpu)[1] = (struct profile_hit *)page_address(page); |
fbd98167e [PATCH] Profiling... |
537 538 539 |
page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE, 0); |
1da177e4c Linux-2.6.12-rc2 |
540 541 542 543 544 545 546 547 |
if (!page) goto out_cleanup; per_cpu(cpu_profile_hits, cpu)[0] = (struct profile_hit *)page_address(page); } return 0; out_cleanup: prof_on = 0; |
d59dd4620 [PATCH] use smp_m... |
548 |
smp_mb(); |
1da177e4c Linux-2.6.12-rc2 |
549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 |
on_each_cpu(profile_nop, NULL, 0, 1); for_each_online_cpu(cpu) { struct page *page; if (per_cpu(cpu_profile_hits, cpu)[0]) { page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[0]); per_cpu(cpu_profile_hits, cpu)[0] = NULL; __free_page(page); } if (per_cpu(cpu_profile_hits, cpu)[1]) { page = virt_to_page(per_cpu(cpu_profile_hits, cpu)[1]); per_cpu(cpu_profile_hits, cpu)[1] = NULL; __free_page(page); } } return -1; } #else #define create_hash_tables() ({ 0; }) #endif static int __init create_proc_profile(void) { struct proc_dir_entry *entry; if (!prof_on) return 0; if (create_hash_tables()) return -1; |
c33fff0af kernel: use non-r... |
578 579 |
entry = proc_create("profile", S_IWUSR | S_IRUGO, NULL, &proc_profile_operations); |
1ad82fd54 debug: clean up k... |
580 |
if (!entry) |
1da177e4c Linux-2.6.12-rc2 |
581 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
582 583 584 585 586 587 |
entry->size = (1+prof_len) * sizeof(atomic_t); hotcpu_notifier(profile_cpu_callback, 0); return 0; } module_init(create_proc_profile); #endif /* CONFIG_PROC_FS */ |