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d64ec10ec8
Currently, 'perf script' uses host unwind methods to parse perf.data
callchain info without taking the target architecture into account, i.e.
assuming the perf.data file was generated on the same machine where the
analysis is being performed. So we get wrong result without any warnings
when unwinding callchains of x86(32-bit) on x86(64-bit) machine.
This patch adds an extra step that checks the target platform before
assigning unwind methods. In later patches in this series, we can use
this info to assign the right unwind methods for supported platforms.
Committer note:
After fixing it to register the local unwinder for live mode tools
('perf trace', 'perf top'), i.e. tools that don't use a perf.data file,
it works as intended and passes the 'perf test unwind' test:
# perf trace -e nanosleep --call dwarf usleep 1
0.328 ( 0.058 ms): usleep/11115 nanosleep(rqtp: 0x7fff083fa480) = 0
__nanosleep_nocancel+0x7 (/usr/lib64/libc-2.22.so)
usleep+0x34 (/usr/lib64/libc-2.22.so)
main+0x1eb (/usr/bin/usleep)
__libc_start_main+0xf0 (/usr/lib64/libc-2.22.so)
_start+0x29 (/usr/bin/usleep)
# perf test 48
48: Test dwarf unwind : Ok
#
Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1464924803-22214-11-git-send-email-hekuang@huawei.com
[ Fixed exit path for 'live' mode tools, where we need to default to local unwinding ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
#ifndef __UNWIND_H
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#define __UNWIND_H
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#include <linux/types.h>
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#include "event.h"
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#include "symbol.h"
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#include "thread.h"
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struct unwind_entry {
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struct map *map;
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struct symbol *sym;
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u64 ip;
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};
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typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
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struct unwind_libunwind_ops {
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int (*prepare_access)(struct thread *thread);
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void (*flush_access)(struct thread *thread);
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void (*finish_access)(struct thread *thread);
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int (*get_entries)(unwind_entry_cb_t cb, void *arg,
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struct thread *thread,
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struct perf_sample *data, int max_stack);
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};
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#ifdef HAVE_DWARF_UNWIND_SUPPORT
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int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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struct thread *thread,
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struct perf_sample *data, int max_stack);
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/* libunwind specific */
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#ifdef HAVE_LIBUNWIND_SUPPORT
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int libunwind__arch_reg_id(int regnum);
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int unwind__prepare_access(struct thread *thread, struct map *map);
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void unwind__flush_access(struct thread *thread);
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void unwind__finish_access(struct thread *thread);
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#else
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static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
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struct map *map __maybe_unused)
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{
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return 0;
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}
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static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
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static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
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#endif
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#else
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static inline int
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unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
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void *arg __maybe_unused,
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struct thread *thread __maybe_unused,
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struct perf_sample *data __maybe_unused,
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int max_stack __maybe_unused)
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{
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return 0;
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}
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static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
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struct map *map __maybe_unused)
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{
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return 0;
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}
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static inline void unwind__flush_access(struct thread *thread __maybe_unused) {}
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static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
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#endif /* HAVE_DWARF_UNWIND_SUPPORT */
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#endif /* __UNWIND_H */
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