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perf/x86: Convert perf_callchain_kernel() to use the new unwinder 

Convert perf_callchain_kernel() to use the new unwinder.  dump_trace()
has been deprecated.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/a2df0c4f09b3d438e11b41681f10b0775a819a7f.1474045023.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Josh Poimboeuf 2016-09-16 14:18:13 -05:00 committed by Ingo Molnar
parent 7c7900f897
commit 35f4d9b325
1 changed files with 10 additions and 23 deletions
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33
arch/x86/events/core.c
View File

@ -37,6 +37,7 @@
#include <asm/timer.h> #include <asm/timer.h>
#include <asm/desc.h> #include <asm/desc.h>
#include <asm/ldt.h> #include <asm/ldt.h>
#include <asm/unwind.h>
#include "perf_event.h" #include "perf_event.h"
@ -2247,31 +2248,12 @@ void arch_perf_update_userpage(struct perf_event *event,
cyc2ns_read_end(data); cyc2ns_read_end(data);
} }
/*
* callchain support
*/
static int backtrace_stack(void *data, const char *name)
{
return 0;
}
static int backtrace_address(void *data, unsigned long addr, int reliable)
{
struct perf_callchain_entry_ctx *entry = data;
return perf_callchain_store(entry, addr);
}
static const struct stacktrace_ops backtrace_ops = {
.stack = backtrace_stack,
.address = backtrace_address,
.walk_stack = print_context_stack_bp,
};
void void
perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
{ {
struct unwind_state state;
unsigned long addr;
if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
/* TODO: We don't support guest os callchain now */ /* TODO: We don't support guest os callchain now */
return; return;
@ -2280,7 +2262,12 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re
if (perf_callchain_store(entry, regs->ip)) if (perf_callchain_store(entry, regs->ip))
return; return;
dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry); for (unwind_start(&state, current, regs, NULL); !unwind_done(&state);
unwind_next_frame(&state)) {
addr = unwind_get_return_address(&state);
if (!addr || perf_callchain_store(entry, addr))
return;
}
} }
static inline int static inline int