100447ccdSAdrian Hunter /* 200447ccdSAdrian Hunter * thread-stack.c: Synthesize a thread's stack using call / return events 300447ccdSAdrian Hunter * Copyright (c) 2014, Intel Corporation. 400447ccdSAdrian Hunter * 500447ccdSAdrian Hunter * This program is free software; you can redistribute it and/or modify it 600447ccdSAdrian Hunter * under the terms and conditions of the GNU General Public License, 700447ccdSAdrian Hunter * version 2, as published by the Free Software Foundation. 800447ccdSAdrian Hunter * 900447ccdSAdrian Hunter * This program is distributed in the hope it will be useful, but WITHOUT 1000447ccdSAdrian Hunter * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1100447ccdSAdrian Hunter * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1200447ccdSAdrian Hunter * more details. 1300447ccdSAdrian Hunter * 1400447ccdSAdrian Hunter */ 1500447ccdSAdrian Hunter 1692a9e4f7SAdrian Hunter #include <linux/rbtree.h> 1792a9e4f7SAdrian Hunter #include <linux/list.h> 18256d92bcSAdrian Hunter #include <linux/log2.h> 19a43783aeSArnaldo Carvalho de Melo #include <errno.h> 2000447ccdSAdrian Hunter #include "thread.h" 2100447ccdSAdrian Hunter #include "event.h" 2292a9e4f7SAdrian Hunter #include "machine.h" 2300447ccdSAdrian Hunter #include "util.h" 2400447ccdSAdrian Hunter #include "debug.h" 2592a9e4f7SAdrian Hunter #include "symbol.h" 2692a9e4f7SAdrian Hunter #include "comm.h" 27451db126SChris Phlipot #include "call-path.h" 2800447ccdSAdrian Hunter #include "thread-stack.h" 2900447ccdSAdrian Hunter 3092a9e4f7SAdrian Hunter #define STACK_GROWTH 2048 3192a9e4f7SAdrian Hunter 3292a9e4f7SAdrian Hunter /** 3392a9e4f7SAdrian Hunter * struct thread_stack_entry - thread stack entry. 3492a9e4f7SAdrian Hunter * @ret_addr: return address 3592a9e4f7SAdrian Hunter * @timestamp: timestamp (if known) 3692a9e4f7SAdrian Hunter * @ref: external reference (e.g. db_id of sample) 3792a9e4f7SAdrian Hunter * @branch_count: the branch count when the entry was created 3892a9e4f7SAdrian Hunter * @cp: call path 3992a9e4f7SAdrian Hunter * @no_call: a 'call' was not seen 404d60e5e3SAdrian Hunter * @trace_end: a 'call' but trace ended 4192a9e4f7SAdrian Hunter */ 4292a9e4f7SAdrian Hunter struct thread_stack_entry { 4392a9e4f7SAdrian Hunter u64 ret_addr; 4492a9e4f7SAdrian Hunter u64 timestamp; 4592a9e4f7SAdrian Hunter u64 ref; 4692a9e4f7SAdrian Hunter u64 branch_count; 4792a9e4f7SAdrian Hunter struct call_path *cp; 4892a9e4f7SAdrian Hunter bool no_call; 494d60e5e3SAdrian Hunter bool trace_end; 5092a9e4f7SAdrian Hunter }; 5192a9e4f7SAdrian Hunter 5292a9e4f7SAdrian Hunter /** 5392a9e4f7SAdrian Hunter * struct thread_stack - thread stack constructed from 'call' and 'return' 5492a9e4f7SAdrian Hunter * branch samples. 5592a9e4f7SAdrian Hunter * @stack: array that holds the stack 5692a9e4f7SAdrian Hunter * @cnt: number of entries in the stack 5792a9e4f7SAdrian Hunter * @sz: current maximum stack size 5892a9e4f7SAdrian Hunter * @trace_nr: current trace number 5992a9e4f7SAdrian Hunter * @branch_count: running branch count 6092a9e4f7SAdrian Hunter * @kernel_start: kernel start address 6192a9e4f7SAdrian Hunter * @last_time: last timestamp 6292a9e4f7SAdrian Hunter * @crp: call/return processor 6392a9e4f7SAdrian Hunter * @comm: current comm 64f6060ac6SAdrian Hunter * @arr_sz: size of array if this is the first element of an array 6592a9e4f7SAdrian Hunter */ 6600447ccdSAdrian Hunter struct thread_stack { 6700447ccdSAdrian Hunter struct thread_stack_entry *stack; 6800447ccdSAdrian Hunter size_t cnt; 6900447ccdSAdrian Hunter size_t sz; 7000447ccdSAdrian Hunter u64 trace_nr; 7192a9e4f7SAdrian Hunter u64 branch_count; 7292a9e4f7SAdrian Hunter u64 kernel_start; 7392a9e4f7SAdrian Hunter u64 last_time; 7492a9e4f7SAdrian Hunter struct call_return_processor *crp; 7592a9e4f7SAdrian Hunter struct comm *comm; 76f6060ac6SAdrian Hunter unsigned int arr_sz; 7700447ccdSAdrian Hunter }; 7800447ccdSAdrian Hunter 79256d92bcSAdrian Hunter /* 80256d92bcSAdrian Hunter * Assume pid == tid == 0 identifies the idle task as defined by 81256d92bcSAdrian Hunter * perf_session__register_idle_thread(). The idle task is really 1 task per cpu, 82256d92bcSAdrian Hunter * and therefore requires a stack for each cpu. 83256d92bcSAdrian Hunter */ 84256d92bcSAdrian Hunter static inline bool thread_stack__per_cpu(struct thread *thread) 85256d92bcSAdrian Hunter { 86256d92bcSAdrian Hunter return !(thread->tid || thread->pid_); 87256d92bcSAdrian Hunter } 88256d92bcSAdrian Hunter 8900447ccdSAdrian Hunter static int thread_stack__grow(struct thread_stack *ts) 9000447ccdSAdrian Hunter { 9100447ccdSAdrian Hunter struct thread_stack_entry *new_stack; 9200447ccdSAdrian Hunter size_t sz, new_sz; 9300447ccdSAdrian Hunter 9400447ccdSAdrian Hunter new_sz = ts->sz + STACK_GROWTH; 9500447ccdSAdrian Hunter sz = new_sz * sizeof(struct thread_stack_entry); 9600447ccdSAdrian Hunter 9700447ccdSAdrian Hunter new_stack = realloc(ts->stack, sz); 9800447ccdSAdrian Hunter if (!new_stack) 9900447ccdSAdrian Hunter return -ENOMEM; 10000447ccdSAdrian Hunter 10100447ccdSAdrian Hunter ts->stack = new_stack; 10200447ccdSAdrian Hunter ts->sz = new_sz; 10300447ccdSAdrian Hunter 10400447ccdSAdrian Hunter return 0; 10500447ccdSAdrian Hunter } 10600447ccdSAdrian Hunter 1072e9e8688SAdrian Hunter static int thread_stack__init(struct thread_stack *ts, struct thread *thread, 1082e9e8688SAdrian Hunter struct call_return_processor *crp) 1092e9e8688SAdrian Hunter { 1102e9e8688SAdrian Hunter int err; 1112e9e8688SAdrian Hunter 1122e9e8688SAdrian Hunter err = thread_stack__grow(ts); 1132e9e8688SAdrian Hunter if (err) 1142e9e8688SAdrian Hunter return err; 1152e9e8688SAdrian Hunter 1162e9e8688SAdrian Hunter if (thread->mg && thread->mg->machine) 1172e9e8688SAdrian Hunter ts->kernel_start = machine__kernel_start(thread->mg->machine); 1182e9e8688SAdrian Hunter else 1192e9e8688SAdrian Hunter ts->kernel_start = 1ULL << 63; 1202e9e8688SAdrian Hunter ts->crp = crp; 1212e9e8688SAdrian Hunter 1222e9e8688SAdrian Hunter return 0; 1232e9e8688SAdrian Hunter } 1242e9e8688SAdrian Hunter 125256d92bcSAdrian Hunter static struct thread_stack *thread_stack__new(struct thread *thread, int cpu, 12692a9e4f7SAdrian Hunter struct call_return_processor *crp) 12700447ccdSAdrian Hunter { 128139f42f3SAdrian Hunter struct thread_stack *ts = thread->ts, *new_ts; 129139f42f3SAdrian Hunter unsigned int old_sz = ts ? ts->arr_sz : 0; 130139f42f3SAdrian Hunter unsigned int new_sz = 1; 13100447ccdSAdrian Hunter 132256d92bcSAdrian Hunter if (thread_stack__per_cpu(thread) && cpu > 0) 133256d92bcSAdrian Hunter new_sz = roundup_pow_of_two(cpu + 1); 134256d92bcSAdrian Hunter 135139f42f3SAdrian Hunter if (!ts || new_sz > old_sz) { 136139f42f3SAdrian Hunter new_ts = calloc(new_sz, sizeof(*ts)); 137139f42f3SAdrian Hunter if (!new_ts) 13800447ccdSAdrian Hunter return NULL; 139139f42f3SAdrian Hunter if (ts) 140139f42f3SAdrian Hunter memcpy(new_ts, ts, old_sz * sizeof(*ts)); 141139f42f3SAdrian Hunter new_ts->arr_sz = new_sz; 142139f42f3SAdrian Hunter zfree(&thread->ts); 143139f42f3SAdrian Hunter thread->ts = new_ts; 144139f42f3SAdrian Hunter ts = new_ts; 14500447ccdSAdrian Hunter } 14600447ccdSAdrian Hunter 147256d92bcSAdrian Hunter if (thread_stack__per_cpu(thread) && cpu > 0 && 148256d92bcSAdrian Hunter (unsigned int)cpu < ts->arr_sz) 149256d92bcSAdrian Hunter ts += cpu; 150256d92bcSAdrian Hunter 151139f42f3SAdrian Hunter if (!ts->stack && 152139f42f3SAdrian Hunter thread_stack__init(ts, thread, crp)) 153139f42f3SAdrian Hunter return NULL; 154bd8e68acSAdrian Hunter 15500447ccdSAdrian Hunter return ts; 15600447ccdSAdrian Hunter } 15700447ccdSAdrian Hunter 158256d92bcSAdrian Hunter static struct thread_stack *thread__cpu_stack(struct thread *thread, int cpu) 159bd8e68acSAdrian Hunter { 160256d92bcSAdrian Hunter struct thread_stack *ts = thread->ts; 161256d92bcSAdrian Hunter 162256d92bcSAdrian Hunter if (cpu < 0) 163256d92bcSAdrian Hunter cpu = 0; 164256d92bcSAdrian Hunter 165256d92bcSAdrian Hunter if (!ts || (unsigned int)cpu >= ts->arr_sz) 166256d92bcSAdrian Hunter return NULL; 167256d92bcSAdrian Hunter 168256d92bcSAdrian Hunter ts += cpu; 169256d92bcSAdrian Hunter 170256d92bcSAdrian Hunter if (!ts->stack) 171256d92bcSAdrian Hunter return NULL; 172256d92bcSAdrian Hunter 173256d92bcSAdrian Hunter return ts; 174256d92bcSAdrian Hunter } 175256d92bcSAdrian Hunter 176256d92bcSAdrian Hunter static inline struct thread_stack *thread__stack(struct thread *thread, 177256d92bcSAdrian Hunter int cpu) 178256d92bcSAdrian Hunter { 179256d92bcSAdrian Hunter if (!thread) 180256d92bcSAdrian Hunter return NULL; 181256d92bcSAdrian Hunter 182256d92bcSAdrian Hunter if (thread_stack__per_cpu(thread)) 183256d92bcSAdrian Hunter return thread__cpu_stack(thread, cpu); 184256d92bcSAdrian Hunter 185256d92bcSAdrian Hunter return thread->ts; 186bd8e68acSAdrian Hunter } 187bd8e68acSAdrian Hunter 1884d60e5e3SAdrian Hunter static int thread_stack__push(struct thread_stack *ts, u64 ret_addr, 1894d60e5e3SAdrian Hunter bool trace_end) 19000447ccdSAdrian Hunter { 19100447ccdSAdrian Hunter int err = 0; 19200447ccdSAdrian Hunter 19300447ccdSAdrian Hunter if (ts->cnt == ts->sz) { 19400447ccdSAdrian Hunter err = thread_stack__grow(ts); 19500447ccdSAdrian Hunter if (err) { 19600447ccdSAdrian Hunter pr_warning("Out of memory: discarding thread stack\n"); 19700447ccdSAdrian Hunter ts->cnt = 0; 19800447ccdSAdrian Hunter } 19900447ccdSAdrian Hunter } 20000447ccdSAdrian Hunter 2014d60e5e3SAdrian Hunter ts->stack[ts->cnt].trace_end = trace_end; 20200447ccdSAdrian Hunter ts->stack[ts->cnt++].ret_addr = ret_addr; 20300447ccdSAdrian Hunter 20400447ccdSAdrian Hunter return err; 20500447ccdSAdrian Hunter } 20600447ccdSAdrian Hunter 20700447ccdSAdrian Hunter static void thread_stack__pop(struct thread_stack *ts, u64 ret_addr) 20800447ccdSAdrian Hunter { 20900447ccdSAdrian Hunter size_t i; 21000447ccdSAdrian Hunter 21100447ccdSAdrian Hunter /* 21200447ccdSAdrian Hunter * In some cases there may be functions which are not seen to return. 21300447ccdSAdrian Hunter * For example when setjmp / longjmp has been used. Or the perf context 21400447ccdSAdrian Hunter * switch in the kernel which doesn't stop and start tracing in exactly 21500447ccdSAdrian Hunter * the same code path. When that happens the return address will be 21600447ccdSAdrian Hunter * further down the stack. If the return address is not found at all, 21700447ccdSAdrian Hunter * we assume the opposite (i.e. this is a return for a call that wasn't 21800447ccdSAdrian Hunter * seen for some reason) and leave the stack alone. 21900447ccdSAdrian Hunter */ 22000447ccdSAdrian Hunter for (i = ts->cnt; i; ) { 22100447ccdSAdrian Hunter if (ts->stack[--i].ret_addr == ret_addr) { 22200447ccdSAdrian Hunter ts->cnt = i; 22300447ccdSAdrian Hunter return; 22400447ccdSAdrian Hunter } 22500447ccdSAdrian Hunter } 22600447ccdSAdrian Hunter } 22700447ccdSAdrian Hunter 2284d60e5e3SAdrian Hunter static void thread_stack__pop_trace_end(struct thread_stack *ts) 2294d60e5e3SAdrian Hunter { 2304d60e5e3SAdrian Hunter size_t i; 2314d60e5e3SAdrian Hunter 2324d60e5e3SAdrian Hunter for (i = ts->cnt; i; ) { 2334d60e5e3SAdrian Hunter if (ts->stack[--i].trace_end) 2344d60e5e3SAdrian Hunter ts->cnt = i; 2354d60e5e3SAdrian Hunter else 2364d60e5e3SAdrian Hunter return; 2374d60e5e3SAdrian Hunter } 2384d60e5e3SAdrian Hunter } 2394d60e5e3SAdrian Hunter 24092a9e4f7SAdrian Hunter static bool thread_stack__in_kernel(struct thread_stack *ts) 24192a9e4f7SAdrian Hunter { 24292a9e4f7SAdrian Hunter if (!ts->cnt) 24392a9e4f7SAdrian Hunter return false; 24492a9e4f7SAdrian Hunter 24592a9e4f7SAdrian Hunter return ts->stack[ts->cnt - 1].cp->in_kernel; 24692a9e4f7SAdrian Hunter } 24792a9e4f7SAdrian Hunter 24892a9e4f7SAdrian Hunter static int thread_stack__call_return(struct thread *thread, 24992a9e4f7SAdrian Hunter struct thread_stack *ts, size_t idx, 25092a9e4f7SAdrian Hunter u64 timestamp, u64 ref, bool no_return) 25192a9e4f7SAdrian Hunter { 25292a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 25392a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 25492a9e4f7SAdrian Hunter struct call_return cr = { 25592a9e4f7SAdrian Hunter .thread = thread, 25692a9e4f7SAdrian Hunter .comm = ts->comm, 25792a9e4f7SAdrian Hunter .db_id = 0, 25892a9e4f7SAdrian Hunter }; 25992a9e4f7SAdrian Hunter 26092a9e4f7SAdrian Hunter tse = &ts->stack[idx]; 26192a9e4f7SAdrian Hunter cr.cp = tse->cp; 26292a9e4f7SAdrian Hunter cr.call_time = tse->timestamp; 26392a9e4f7SAdrian Hunter cr.return_time = timestamp; 26492a9e4f7SAdrian Hunter cr.branch_count = ts->branch_count - tse->branch_count; 26592a9e4f7SAdrian Hunter cr.call_ref = tse->ref; 26692a9e4f7SAdrian Hunter cr.return_ref = ref; 26792a9e4f7SAdrian Hunter if (tse->no_call) 26892a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_CALL; 26992a9e4f7SAdrian Hunter if (no_return) 27092a9e4f7SAdrian Hunter cr.flags |= CALL_RETURN_NO_RETURN; 27192a9e4f7SAdrian Hunter 27292a9e4f7SAdrian Hunter return crp->process(&cr, crp->data); 27392a9e4f7SAdrian Hunter } 27492a9e4f7SAdrian Hunter 275a5499b37SAdrian Hunter static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts) 27692a9e4f7SAdrian Hunter { 27792a9e4f7SAdrian Hunter struct call_return_processor *crp = ts->crp; 27892a9e4f7SAdrian Hunter int err; 27992a9e4f7SAdrian Hunter 28092a9e4f7SAdrian Hunter if (!crp) { 28192a9e4f7SAdrian Hunter ts->cnt = 0; 28292a9e4f7SAdrian Hunter return 0; 28392a9e4f7SAdrian Hunter } 28492a9e4f7SAdrian Hunter 28592a9e4f7SAdrian Hunter while (ts->cnt) { 28692a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 28792a9e4f7SAdrian Hunter ts->last_time, 0, true); 28892a9e4f7SAdrian Hunter if (err) { 28992a9e4f7SAdrian Hunter pr_err("Error flushing thread stack!\n"); 29092a9e4f7SAdrian Hunter ts->cnt = 0; 29192a9e4f7SAdrian Hunter return err; 29292a9e4f7SAdrian Hunter } 29392a9e4f7SAdrian Hunter } 29492a9e4f7SAdrian Hunter 29592a9e4f7SAdrian Hunter return 0; 29692a9e4f7SAdrian Hunter } 29792a9e4f7SAdrian Hunter 298a5499b37SAdrian Hunter int thread_stack__flush(struct thread *thread) 299a5499b37SAdrian Hunter { 300bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 301f6060ac6SAdrian Hunter unsigned int pos; 302f6060ac6SAdrian Hunter int err = 0; 303bd8e68acSAdrian Hunter 304f6060ac6SAdrian Hunter if (ts) { 305f6060ac6SAdrian Hunter for (pos = 0; pos < ts->arr_sz; pos++) { 306f6060ac6SAdrian Hunter int ret = __thread_stack__flush(thread, ts + pos); 307a5499b37SAdrian Hunter 308f6060ac6SAdrian Hunter if (ret) 309f6060ac6SAdrian Hunter err = ret; 310f6060ac6SAdrian Hunter } 311f6060ac6SAdrian Hunter } 312f6060ac6SAdrian Hunter 313f6060ac6SAdrian Hunter return err; 314a5499b37SAdrian Hunter } 315a5499b37SAdrian Hunter 316256d92bcSAdrian Hunter int thread_stack__event(struct thread *thread, int cpu, u32 flags, u64 from_ip, 31700447ccdSAdrian Hunter u64 to_ip, u16 insn_len, u64 trace_nr) 31800447ccdSAdrian Hunter { 319256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 320bd8e68acSAdrian Hunter 32100447ccdSAdrian Hunter if (!thread) 32200447ccdSAdrian Hunter return -EINVAL; 32300447ccdSAdrian Hunter 324bd8e68acSAdrian Hunter if (!ts) { 325256d92bcSAdrian Hunter ts = thread_stack__new(thread, cpu, NULL); 326bd8e68acSAdrian Hunter if (!ts) { 32700447ccdSAdrian Hunter pr_warning("Out of memory: no thread stack\n"); 32800447ccdSAdrian Hunter return -ENOMEM; 32900447ccdSAdrian Hunter } 330bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 33100447ccdSAdrian Hunter } 33200447ccdSAdrian Hunter 33300447ccdSAdrian Hunter /* 33400447ccdSAdrian Hunter * When the trace is discontinuous, the trace_nr changes. In that case 33500447ccdSAdrian Hunter * the stack might be completely invalid. Better to report nothing than 33692a9e4f7SAdrian Hunter * to report something misleading, so flush the stack. 33700447ccdSAdrian Hunter */ 338bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 339bd8e68acSAdrian Hunter if (ts->trace_nr) 340bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 341bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 34200447ccdSAdrian Hunter } 34300447ccdSAdrian Hunter 34492a9e4f7SAdrian Hunter /* Stop here if thread_stack__process() is in use */ 345bd8e68acSAdrian Hunter if (ts->crp) 34692a9e4f7SAdrian Hunter return 0; 34792a9e4f7SAdrian Hunter 34800447ccdSAdrian Hunter if (flags & PERF_IP_FLAG_CALL) { 34900447ccdSAdrian Hunter u64 ret_addr; 35000447ccdSAdrian Hunter 35100447ccdSAdrian Hunter if (!to_ip) 35200447ccdSAdrian Hunter return 0; 35300447ccdSAdrian Hunter ret_addr = from_ip + insn_len; 35400447ccdSAdrian Hunter if (ret_addr == to_ip) 35500447ccdSAdrian Hunter return 0; /* Zero-length calls are excluded */ 356bd8e68acSAdrian Hunter return thread_stack__push(ts, ret_addr, 3574d60e5e3SAdrian Hunter flags & PERF_IP_FLAG_TRACE_END); 3584d60e5e3SAdrian Hunter } else if (flags & PERF_IP_FLAG_TRACE_BEGIN) { 3594d60e5e3SAdrian Hunter /* 3604d60e5e3SAdrian Hunter * If the caller did not change the trace number (which would 3614d60e5e3SAdrian Hunter * have flushed the stack) then try to make sense of the stack. 3624d60e5e3SAdrian Hunter * Possibly, tracing began after returning to the current 3634d60e5e3SAdrian Hunter * address, so try to pop that. Also, do not expect a call made 3644d60e5e3SAdrian Hunter * when the trace ended, to return, so pop that. 3654d60e5e3SAdrian Hunter */ 366bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 367bd8e68acSAdrian Hunter thread_stack__pop_trace_end(ts); 3684d60e5e3SAdrian Hunter } else if ((flags & PERF_IP_FLAG_RETURN) && from_ip) { 369bd8e68acSAdrian Hunter thread_stack__pop(ts, to_ip); 37000447ccdSAdrian Hunter } 37100447ccdSAdrian Hunter 37200447ccdSAdrian Hunter return 0; 37300447ccdSAdrian Hunter } 37400447ccdSAdrian Hunter 375256d92bcSAdrian Hunter void thread_stack__set_trace_nr(struct thread *thread, int cpu, u64 trace_nr) 37692a9e4f7SAdrian Hunter { 377256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 378bd8e68acSAdrian Hunter 379bd8e68acSAdrian Hunter if (!ts) 38092a9e4f7SAdrian Hunter return; 38192a9e4f7SAdrian Hunter 382bd8e68acSAdrian Hunter if (trace_nr != ts->trace_nr) { 383bd8e68acSAdrian Hunter if (ts->trace_nr) 384bd8e68acSAdrian Hunter __thread_stack__flush(thread, ts); 385bd8e68acSAdrian Hunter ts->trace_nr = trace_nr; 38692a9e4f7SAdrian Hunter } 38792a9e4f7SAdrian Hunter } 38892a9e4f7SAdrian Hunter 389f6060ac6SAdrian Hunter static void __thread_stack__free(struct thread *thread, struct thread_stack *ts) 390f6060ac6SAdrian Hunter { 391f6060ac6SAdrian Hunter __thread_stack__flush(thread, ts); 392f6060ac6SAdrian Hunter zfree(&ts->stack); 393f6060ac6SAdrian Hunter } 394f6060ac6SAdrian Hunter 395f6060ac6SAdrian Hunter static void thread_stack__reset(struct thread *thread, struct thread_stack *ts) 396f6060ac6SAdrian Hunter { 397f6060ac6SAdrian Hunter unsigned int arr_sz = ts->arr_sz; 398f6060ac6SAdrian Hunter 399f6060ac6SAdrian Hunter __thread_stack__free(thread, ts); 400f6060ac6SAdrian Hunter memset(ts, 0, sizeof(*ts)); 401f6060ac6SAdrian Hunter ts->arr_sz = arr_sz; 402f6060ac6SAdrian Hunter } 403f6060ac6SAdrian Hunter 40400447ccdSAdrian Hunter void thread_stack__free(struct thread *thread) 40500447ccdSAdrian Hunter { 406bd8e68acSAdrian Hunter struct thread_stack *ts = thread->ts; 407f6060ac6SAdrian Hunter unsigned int pos; 408bd8e68acSAdrian Hunter 409bd8e68acSAdrian Hunter if (ts) { 410f6060ac6SAdrian Hunter for (pos = 0; pos < ts->arr_sz; pos++) 411f6060ac6SAdrian Hunter __thread_stack__free(thread, ts + pos); 41200447ccdSAdrian Hunter zfree(&thread->ts); 41300447ccdSAdrian Hunter } 41400447ccdSAdrian Hunter } 41500447ccdSAdrian Hunter 41624248306SAdrian Hunter static inline u64 callchain_context(u64 ip, u64 kernel_start) 41700447ccdSAdrian Hunter { 41824248306SAdrian Hunter return ip < kernel_start ? PERF_CONTEXT_USER : PERF_CONTEXT_KERNEL; 41924248306SAdrian Hunter } 42000447ccdSAdrian Hunter 421256d92bcSAdrian Hunter void thread_stack__sample(struct thread *thread, int cpu, 422256d92bcSAdrian Hunter struct ip_callchain *chain, 42324248306SAdrian Hunter size_t sz, u64 ip, u64 kernel_start) 42424248306SAdrian Hunter { 425256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 42624248306SAdrian Hunter u64 context = callchain_context(ip, kernel_start); 42724248306SAdrian Hunter u64 last_context; 42824248306SAdrian Hunter size_t i, j; 42900447ccdSAdrian Hunter 43024248306SAdrian Hunter if (sz < 2) { 43124248306SAdrian Hunter chain->nr = 0; 43224248306SAdrian Hunter return; 43324248306SAdrian Hunter } 43400447ccdSAdrian Hunter 43524248306SAdrian Hunter chain->ips[0] = context; 43624248306SAdrian Hunter chain->ips[1] = ip; 43724248306SAdrian Hunter 438bd8e68acSAdrian Hunter if (!ts) { 43924248306SAdrian Hunter chain->nr = 2; 44024248306SAdrian Hunter return; 44124248306SAdrian Hunter } 44224248306SAdrian Hunter 44324248306SAdrian Hunter last_context = context; 44424248306SAdrian Hunter 445bd8e68acSAdrian Hunter for (i = 2, j = 1; i < sz && j <= ts->cnt; i++, j++) { 446bd8e68acSAdrian Hunter ip = ts->stack[ts->cnt - j].ret_addr; 44724248306SAdrian Hunter context = callchain_context(ip, kernel_start); 44824248306SAdrian Hunter if (context != last_context) { 44924248306SAdrian Hunter if (i >= sz - 1) 45024248306SAdrian Hunter break; 45124248306SAdrian Hunter chain->ips[i++] = context; 45224248306SAdrian Hunter last_context = context; 45324248306SAdrian Hunter } 45424248306SAdrian Hunter chain->ips[i] = ip; 45524248306SAdrian Hunter } 45624248306SAdrian Hunter 45724248306SAdrian Hunter chain->nr = i; 45800447ccdSAdrian Hunter } 45992a9e4f7SAdrian Hunter 46092a9e4f7SAdrian Hunter struct call_return_processor * 46192a9e4f7SAdrian Hunter call_return_processor__new(int (*process)(struct call_return *cr, void *data), 46292a9e4f7SAdrian Hunter void *data) 46392a9e4f7SAdrian Hunter { 46492a9e4f7SAdrian Hunter struct call_return_processor *crp; 46592a9e4f7SAdrian Hunter 46692a9e4f7SAdrian Hunter crp = zalloc(sizeof(struct call_return_processor)); 46792a9e4f7SAdrian Hunter if (!crp) 46892a9e4f7SAdrian Hunter return NULL; 46992a9e4f7SAdrian Hunter crp->cpr = call_path_root__new(); 47092a9e4f7SAdrian Hunter if (!crp->cpr) 47192a9e4f7SAdrian Hunter goto out_free; 47292a9e4f7SAdrian Hunter crp->process = process; 47392a9e4f7SAdrian Hunter crp->data = data; 47492a9e4f7SAdrian Hunter return crp; 47592a9e4f7SAdrian Hunter 47692a9e4f7SAdrian Hunter out_free: 47792a9e4f7SAdrian Hunter free(crp); 47892a9e4f7SAdrian Hunter return NULL; 47992a9e4f7SAdrian Hunter } 48092a9e4f7SAdrian Hunter 48192a9e4f7SAdrian Hunter void call_return_processor__free(struct call_return_processor *crp) 48292a9e4f7SAdrian Hunter { 48392a9e4f7SAdrian Hunter if (crp) { 48492a9e4f7SAdrian Hunter call_path_root__free(crp->cpr); 48592a9e4f7SAdrian Hunter free(crp); 48692a9e4f7SAdrian Hunter } 48792a9e4f7SAdrian Hunter } 48892a9e4f7SAdrian Hunter 48992a9e4f7SAdrian Hunter static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr, 49092a9e4f7SAdrian Hunter u64 timestamp, u64 ref, struct call_path *cp, 4912dcde4e1SAdrian Hunter bool no_call, bool trace_end) 49292a9e4f7SAdrian Hunter { 49392a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 49492a9e4f7SAdrian Hunter int err; 49592a9e4f7SAdrian Hunter 49692a9e4f7SAdrian Hunter if (ts->cnt == ts->sz) { 49792a9e4f7SAdrian Hunter err = thread_stack__grow(ts); 49892a9e4f7SAdrian Hunter if (err) 49992a9e4f7SAdrian Hunter return err; 50092a9e4f7SAdrian Hunter } 50192a9e4f7SAdrian Hunter 50292a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt++]; 50392a9e4f7SAdrian Hunter tse->ret_addr = ret_addr; 50492a9e4f7SAdrian Hunter tse->timestamp = timestamp; 50592a9e4f7SAdrian Hunter tse->ref = ref; 50692a9e4f7SAdrian Hunter tse->branch_count = ts->branch_count; 50792a9e4f7SAdrian Hunter tse->cp = cp; 50892a9e4f7SAdrian Hunter tse->no_call = no_call; 5092dcde4e1SAdrian Hunter tse->trace_end = trace_end; 51092a9e4f7SAdrian Hunter 51192a9e4f7SAdrian Hunter return 0; 51292a9e4f7SAdrian Hunter } 51392a9e4f7SAdrian Hunter 51492a9e4f7SAdrian Hunter static int thread_stack__pop_cp(struct thread *thread, struct thread_stack *ts, 51592a9e4f7SAdrian Hunter u64 ret_addr, u64 timestamp, u64 ref, 51692a9e4f7SAdrian Hunter struct symbol *sym) 51792a9e4f7SAdrian Hunter { 51892a9e4f7SAdrian Hunter int err; 51992a9e4f7SAdrian Hunter 52092a9e4f7SAdrian Hunter if (!ts->cnt) 52192a9e4f7SAdrian Hunter return 1; 52292a9e4f7SAdrian Hunter 52392a9e4f7SAdrian Hunter if (ts->cnt == 1) { 52492a9e4f7SAdrian Hunter struct thread_stack_entry *tse = &ts->stack[0]; 52592a9e4f7SAdrian Hunter 52692a9e4f7SAdrian Hunter if (tse->cp->sym == sym) 52792a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 52892a9e4f7SAdrian Hunter timestamp, ref, false); 52992a9e4f7SAdrian Hunter } 53092a9e4f7SAdrian Hunter 53192a9e4f7SAdrian Hunter if (ts->stack[ts->cnt - 1].ret_addr == ret_addr) { 53292a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 53392a9e4f7SAdrian Hunter timestamp, ref, false); 53492a9e4f7SAdrian Hunter } else { 53592a9e4f7SAdrian Hunter size_t i = ts->cnt - 1; 53692a9e4f7SAdrian Hunter 53792a9e4f7SAdrian Hunter while (i--) { 53892a9e4f7SAdrian Hunter if (ts->stack[i].ret_addr != ret_addr) 53992a9e4f7SAdrian Hunter continue; 54092a9e4f7SAdrian Hunter i += 1; 54192a9e4f7SAdrian Hunter while (ts->cnt > i) { 54292a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, 54392a9e4f7SAdrian Hunter --ts->cnt, 54492a9e4f7SAdrian Hunter timestamp, ref, 54592a9e4f7SAdrian Hunter true); 54692a9e4f7SAdrian Hunter if (err) 54792a9e4f7SAdrian Hunter return err; 54892a9e4f7SAdrian Hunter } 54992a9e4f7SAdrian Hunter return thread_stack__call_return(thread, ts, --ts->cnt, 55092a9e4f7SAdrian Hunter timestamp, ref, false); 55192a9e4f7SAdrian Hunter } 55292a9e4f7SAdrian Hunter } 55392a9e4f7SAdrian Hunter 55492a9e4f7SAdrian Hunter return 1; 55592a9e4f7SAdrian Hunter } 55692a9e4f7SAdrian Hunter 557e0b89511SAdrian Hunter static int thread_stack__bottom(struct thread_stack *ts, 55892a9e4f7SAdrian Hunter struct perf_sample *sample, 55992a9e4f7SAdrian Hunter struct addr_location *from_al, 56092a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 56192a9e4f7SAdrian Hunter { 56292a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 56392a9e4f7SAdrian Hunter struct call_path *cp; 56492a9e4f7SAdrian Hunter struct symbol *sym; 56592a9e4f7SAdrian Hunter u64 ip; 56692a9e4f7SAdrian Hunter 56792a9e4f7SAdrian Hunter if (sample->ip) { 56892a9e4f7SAdrian Hunter ip = sample->ip; 56992a9e4f7SAdrian Hunter sym = from_al->sym; 57092a9e4f7SAdrian Hunter } else if (sample->addr) { 57192a9e4f7SAdrian Hunter ip = sample->addr; 57292a9e4f7SAdrian Hunter sym = to_al->sym; 57392a9e4f7SAdrian Hunter } else { 57492a9e4f7SAdrian Hunter return 0; 57592a9e4f7SAdrian Hunter } 57692a9e4f7SAdrian Hunter 57792a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, sym, ip, 57892a9e4f7SAdrian Hunter ts->kernel_start); 57992a9e4f7SAdrian Hunter if (!cp) 58092a9e4f7SAdrian Hunter return -ENOMEM; 58192a9e4f7SAdrian Hunter 582e0b89511SAdrian Hunter return thread_stack__push_cp(ts, ip, sample->time, ref, cp, 5832dcde4e1SAdrian Hunter true, false); 58492a9e4f7SAdrian Hunter } 58592a9e4f7SAdrian Hunter 58692a9e4f7SAdrian Hunter static int thread_stack__no_call_return(struct thread *thread, 58792a9e4f7SAdrian Hunter struct thread_stack *ts, 58892a9e4f7SAdrian Hunter struct perf_sample *sample, 58992a9e4f7SAdrian Hunter struct addr_location *from_al, 59092a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref) 59192a9e4f7SAdrian Hunter { 59292a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 59392a9e4f7SAdrian Hunter struct call_path *cp, *parent; 59492a9e4f7SAdrian Hunter u64 ks = ts->kernel_start; 59592a9e4f7SAdrian Hunter int err; 59692a9e4f7SAdrian Hunter 59792a9e4f7SAdrian Hunter if (sample->ip >= ks && sample->addr < ks) { 59892a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 59992a9e4f7SAdrian Hunter while (thread_stack__in_kernel(ts)) { 60092a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 60192a9e4f7SAdrian Hunter sample->time, ref, 60292a9e4f7SAdrian Hunter true); 60392a9e4f7SAdrian Hunter if (err) 60492a9e4f7SAdrian Hunter return err; 60592a9e4f7SAdrian Hunter } 60692a9e4f7SAdrian Hunter 60792a9e4f7SAdrian Hunter /* If the stack is empty, push the userspace address */ 60892a9e4f7SAdrian Hunter if (!ts->cnt) { 60992a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, &cpr->call_path, 61092a9e4f7SAdrian Hunter to_al->sym, sample->addr, 61192a9e4f7SAdrian Hunter ts->kernel_start); 61292a9e4f7SAdrian Hunter if (!cp) 61392a9e4f7SAdrian Hunter return -ENOMEM; 61492a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, 0, sample->time, ref, 6152dcde4e1SAdrian Hunter cp, true, false); 61692a9e4f7SAdrian Hunter } 61792a9e4f7SAdrian Hunter } else if (thread_stack__in_kernel(ts) && sample->ip < ks) { 61892a9e4f7SAdrian Hunter /* Return to userspace, so pop all kernel addresses */ 61992a9e4f7SAdrian Hunter while (thread_stack__in_kernel(ts)) { 62092a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 62192a9e4f7SAdrian Hunter sample->time, ref, 62292a9e4f7SAdrian Hunter true); 62392a9e4f7SAdrian Hunter if (err) 62492a9e4f7SAdrian Hunter return err; 62592a9e4f7SAdrian Hunter } 62692a9e4f7SAdrian Hunter } 62792a9e4f7SAdrian Hunter 62892a9e4f7SAdrian Hunter if (ts->cnt) 62992a9e4f7SAdrian Hunter parent = ts->stack[ts->cnt - 1].cp; 63092a9e4f7SAdrian Hunter else 63192a9e4f7SAdrian Hunter parent = &cpr->call_path; 63292a9e4f7SAdrian Hunter 63392a9e4f7SAdrian Hunter /* This 'return' had no 'call', so push and pop top of stack */ 63492a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, parent, from_al->sym, sample->ip, 63592a9e4f7SAdrian Hunter ts->kernel_start); 63692a9e4f7SAdrian Hunter if (!cp) 63792a9e4f7SAdrian Hunter return -ENOMEM; 63892a9e4f7SAdrian Hunter 63992a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, sample->addr, sample->time, ref, cp, 6402dcde4e1SAdrian Hunter true, false); 64192a9e4f7SAdrian Hunter if (err) 64292a9e4f7SAdrian Hunter return err; 64392a9e4f7SAdrian Hunter 64492a9e4f7SAdrian Hunter return thread_stack__pop_cp(thread, ts, sample->addr, sample->time, ref, 64592a9e4f7SAdrian Hunter to_al->sym); 64692a9e4f7SAdrian Hunter } 64792a9e4f7SAdrian Hunter 64892a9e4f7SAdrian Hunter static int thread_stack__trace_begin(struct thread *thread, 64992a9e4f7SAdrian Hunter struct thread_stack *ts, u64 timestamp, 65092a9e4f7SAdrian Hunter u64 ref) 65192a9e4f7SAdrian Hunter { 65292a9e4f7SAdrian Hunter struct thread_stack_entry *tse; 65392a9e4f7SAdrian Hunter int err; 65492a9e4f7SAdrian Hunter 65592a9e4f7SAdrian Hunter if (!ts->cnt) 65692a9e4f7SAdrian Hunter return 0; 65792a9e4f7SAdrian Hunter 65892a9e4f7SAdrian Hunter /* Pop trace end */ 65992a9e4f7SAdrian Hunter tse = &ts->stack[ts->cnt - 1]; 6602dcde4e1SAdrian Hunter if (tse->trace_end) { 66192a9e4f7SAdrian Hunter err = thread_stack__call_return(thread, ts, --ts->cnt, 66292a9e4f7SAdrian Hunter timestamp, ref, false); 66392a9e4f7SAdrian Hunter if (err) 66492a9e4f7SAdrian Hunter return err; 66592a9e4f7SAdrian Hunter } 66692a9e4f7SAdrian Hunter 66792a9e4f7SAdrian Hunter return 0; 66892a9e4f7SAdrian Hunter } 66992a9e4f7SAdrian Hunter 67092a9e4f7SAdrian Hunter static int thread_stack__trace_end(struct thread_stack *ts, 67192a9e4f7SAdrian Hunter struct perf_sample *sample, u64 ref) 67292a9e4f7SAdrian Hunter { 67392a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 67492a9e4f7SAdrian Hunter struct call_path *cp; 67592a9e4f7SAdrian Hunter u64 ret_addr; 67692a9e4f7SAdrian Hunter 67792a9e4f7SAdrian Hunter /* No point having 'trace end' on the bottom of the stack */ 67892a9e4f7SAdrian Hunter if (!ts->cnt || (ts->cnt == 1 && ts->stack[0].ref == ref)) 67992a9e4f7SAdrian Hunter return 0; 68092a9e4f7SAdrian Hunter 68192a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, NULL, 0, 68292a9e4f7SAdrian Hunter ts->kernel_start); 68392a9e4f7SAdrian Hunter if (!cp) 68492a9e4f7SAdrian Hunter return -ENOMEM; 68592a9e4f7SAdrian Hunter 68692a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 68792a9e4f7SAdrian Hunter 68892a9e4f7SAdrian Hunter return thread_stack__push_cp(ts, ret_addr, sample->time, ref, cp, 6892dcde4e1SAdrian Hunter false, true); 69092a9e4f7SAdrian Hunter } 69192a9e4f7SAdrian Hunter 69292a9e4f7SAdrian Hunter int thread_stack__process(struct thread *thread, struct comm *comm, 69392a9e4f7SAdrian Hunter struct perf_sample *sample, 69492a9e4f7SAdrian Hunter struct addr_location *from_al, 69592a9e4f7SAdrian Hunter struct addr_location *to_al, u64 ref, 69692a9e4f7SAdrian Hunter struct call_return_processor *crp) 69792a9e4f7SAdrian Hunter { 698256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, sample->cpu); 69992a9e4f7SAdrian Hunter int err = 0; 70092a9e4f7SAdrian Hunter 70103b32cb2SAdrian Hunter if (ts && !ts->crp) { 70292a9e4f7SAdrian Hunter /* Supersede thread_stack__event() */ 703f6060ac6SAdrian Hunter thread_stack__reset(thread, ts); 70403b32cb2SAdrian Hunter ts = NULL; 70592a9e4f7SAdrian Hunter } 70603b32cb2SAdrian Hunter 70703b32cb2SAdrian Hunter if (!ts) { 708256d92bcSAdrian Hunter ts = thread_stack__new(thread, sample->cpu, crp); 709bd8e68acSAdrian Hunter if (!ts) 71092a9e4f7SAdrian Hunter return -ENOMEM; 71192a9e4f7SAdrian Hunter ts->comm = comm; 71292a9e4f7SAdrian Hunter } 71392a9e4f7SAdrian Hunter 71492a9e4f7SAdrian Hunter /* Flush stack on exec */ 71592a9e4f7SAdrian Hunter if (ts->comm != comm && thread->pid_ == thread->tid) { 716a5499b37SAdrian Hunter err = __thread_stack__flush(thread, ts); 71792a9e4f7SAdrian Hunter if (err) 71892a9e4f7SAdrian Hunter return err; 71992a9e4f7SAdrian Hunter ts->comm = comm; 72092a9e4f7SAdrian Hunter } 72192a9e4f7SAdrian Hunter 72292a9e4f7SAdrian Hunter /* If the stack is empty, put the current symbol on the stack */ 72392a9e4f7SAdrian Hunter if (!ts->cnt) { 724e0b89511SAdrian Hunter err = thread_stack__bottom(ts, sample, from_al, to_al, ref); 72592a9e4f7SAdrian Hunter if (err) 72692a9e4f7SAdrian Hunter return err; 72792a9e4f7SAdrian Hunter } 72892a9e4f7SAdrian Hunter 72992a9e4f7SAdrian Hunter ts->branch_count += 1; 73092a9e4f7SAdrian Hunter ts->last_time = sample->time; 73192a9e4f7SAdrian Hunter 73292a9e4f7SAdrian Hunter if (sample->flags & PERF_IP_FLAG_CALL) { 7332dcde4e1SAdrian Hunter bool trace_end = sample->flags & PERF_IP_FLAG_TRACE_END; 73492a9e4f7SAdrian Hunter struct call_path_root *cpr = ts->crp->cpr; 73592a9e4f7SAdrian Hunter struct call_path *cp; 73692a9e4f7SAdrian Hunter u64 ret_addr; 73792a9e4f7SAdrian Hunter 73892a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 73992a9e4f7SAdrian Hunter return 0; 74092a9e4f7SAdrian Hunter 74192a9e4f7SAdrian Hunter ret_addr = sample->ip + sample->insn_len; 74292a9e4f7SAdrian Hunter if (ret_addr == sample->addr) 74392a9e4f7SAdrian Hunter return 0; /* Zero-length calls are excluded */ 74492a9e4f7SAdrian Hunter 74592a9e4f7SAdrian Hunter cp = call_path__findnew(cpr, ts->stack[ts->cnt - 1].cp, 74692a9e4f7SAdrian Hunter to_al->sym, sample->addr, 74792a9e4f7SAdrian Hunter ts->kernel_start); 74892a9e4f7SAdrian Hunter if (!cp) 74992a9e4f7SAdrian Hunter return -ENOMEM; 75092a9e4f7SAdrian Hunter err = thread_stack__push_cp(ts, ret_addr, sample->time, ref, 7512dcde4e1SAdrian Hunter cp, false, trace_end); 75292a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_RETURN) { 75392a9e4f7SAdrian Hunter if (!sample->ip || !sample->addr) 75492a9e4f7SAdrian Hunter return 0; 75592a9e4f7SAdrian Hunter 75692a9e4f7SAdrian Hunter err = thread_stack__pop_cp(thread, ts, sample->addr, 75792a9e4f7SAdrian Hunter sample->time, ref, from_al->sym); 75892a9e4f7SAdrian Hunter if (err) { 75992a9e4f7SAdrian Hunter if (err < 0) 76092a9e4f7SAdrian Hunter return err; 76192a9e4f7SAdrian Hunter err = thread_stack__no_call_return(thread, ts, sample, 76292a9e4f7SAdrian Hunter from_al, to_al, ref); 76392a9e4f7SAdrian Hunter } 76492a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_BEGIN) { 76592a9e4f7SAdrian Hunter err = thread_stack__trace_begin(thread, ts, sample->time, ref); 76692a9e4f7SAdrian Hunter } else if (sample->flags & PERF_IP_FLAG_TRACE_END) { 76792a9e4f7SAdrian Hunter err = thread_stack__trace_end(ts, sample, ref); 76892a9e4f7SAdrian Hunter } 76992a9e4f7SAdrian Hunter 77092a9e4f7SAdrian Hunter return err; 77192a9e4f7SAdrian Hunter } 772e216708dSAdrian Hunter 773256d92bcSAdrian Hunter size_t thread_stack__depth(struct thread *thread, int cpu) 774e216708dSAdrian Hunter { 775256d92bcSAdrian Hunter struct thread_stack *ts = thread__stack(thread, cpu); 776bd8e68acSAdrian Hunter 777bd8e68acSAdrian Hunter if (!ts) 778e216708dSAdrian Hunter return 0; 779bd8e68acSAdrian Hunter return ts->cnt; 780e216708dSAdrian Hunter } 781