Release 4.14 arch/mips/kernel/perf_event.c
/*
* Linux performance counter support for MIPS.
*
* Copyright (C) 2010 MIPS Technologies, Inc.
* Author: Deng-Cheng Zhu
*
* This code is based on the implementation for ARM, which is in turn
* based on the sparc64 perf event code and the x86 code. Performance
* counter access is based on the MIPS Oprofile code. And the callchain
* support references the code of MIPS stacktrace.c.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/perf_event.h>
#include <linux/sched/task_stack.h>
#include <asm/stacktrace.h>
/* Callchain handling code. */
/*
* Leave userspace callchain empty for now. When we find a way to trace
* the user stack callchains, we will add it here.
*/
static void save_raw_perf_callchain(struct perf_callchain_entry_ctx *entry,
unsigned long reg29)
{
unsigned long *sp = (unsigned long *)reg29;
unsigned long addr;
while (!kstack_end(sp)) {
addr = *sp++;
if (__kernel_text_address(addr)) {
perf_callchain_store(entry, addr);
if (entry->nr >= entry->max_stack)
break;
}
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Deng-Cheng Zhu | 70 | 94.59% | 2 | 66.67% |
| Arnaldo Carvalho de Melo | 4 | 5.41% | 1 | 33.33% |
| Total | 74 | 100.00% | 3 | 100.00% |
void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
unsigned long sp = regs->regs[29];
#ifdef CONFIG_KALLSYMS
unsigned long ra = regs->regs[31];
unsigned long pc = regs->cp0_epc;
if (raw_show_trace || !__kernel_text_address(pc)) {
unsigned long stack_page =
(unsigned long)task_stack_page(current);
if (stack_page && sp >= stack_page &&
sp <= stack_page + THREAD_SIZE - 32)
save_raw_perf_callchain(entry, sp);
return;
}
do {
perf_callchain_store(entry, pc);
if (entry->nr >= entry->max_stack)
break;
pc = unwind_stack(current, &sp, pc, &ra);
} while (pc);
#else
save_raw_perf_callchain(entry, sp);
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Deng-Cheng Zhu | 145 | 97.32% | 2 | 66.67% |
| Arnaldo Carvalho de Melo | 4 | 2.68% | 1 | 33.33% |
| Total | 149 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Deng-Cheng Zhu | 222 | 94.47% | 3 | 50.00% |
| Arnaldo Carvalho de Melo | 8 | 3.40% | 1 | 16.67% |
| Ingo Molnar | 3 | 1.28% | 1 | 16.67% |
| David Daney | 2 | 0.85% | 1 | 16.67% |
| Total | 235 | 100.00% | 6 | 100.00% |
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