![Frederic Weisbecker](/assets/img/avatar_default.png)
About every callchains recorded with perf record are filled up including the internal perfcounter nmi frame: perf_callchain perf_counter_overflow intel_pmu_handle_irq perf_counter_nmi_handler notifier_call_chain atomic_notifier_call_chain notify_die do_nmi nmi We want ignore this frame as it's not interesting for instrumentation. To solve this, we simply ignore every frames from nmi context. New example of "perf report -s sym -c" after this patch: 9.59% [k] search_by_key 4.88% search_by_key reiserfs_read_locked_inode reiserfs_iget reiserfs_lookup do_lookup __link_path_walk path_walk do_path_lookup user_path_at vfs_fstatat vfs_lstat sys_newlstat system_call_fastpath __lxstat 0x406fb1 3.19% search_by_key search_by_entry_key reiserfs_find_entry reiserfs_lookup do_lookup __link_path_walk path_walk do_path_lookup user_path_at vfs_fstatat vfs_lstat sys_newlstat system_call_fastpath __lxstat 0x406fb1 [...] For now this patch only solves the problem in x86-64. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Anton Blanchard <anton@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1246474930-6088-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
24 lines
697 B
C
24 lines
697 B
C
#ifndef _ASM_X86_STACKTRACE_H
|
|
#define _ASM_X86_STACKTRACE_H
|
|
|
|
extern int kstack_depth_to_print;
|
|
|
|
int x86_is_stack_id(int id, char *name);
|
|
|
|
/* Generic stack tracer with callbacks */
|
|
|
|
struct stacktrace_ops {
|
|
void (*warning)(void *data, char *msg);
|
|
/* msg must contain %s for the symbol */
|
|
void (*warning_symbol)(void *data, char *msg, unsigned long symbol);
|
|
void (*address)(void *data, unsigned long address, int reliable);
|
|
/* On negative return stop dumping */
|
|
int (*stack)(void *data, char *name);
|
|
};
|
|
|
|
void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
|
|
unsigned long *stack, unsigned long bp,
|
|
const struct stacktrace_ops *ops, void *data);
|
|
|
|
#endif /* _ASM_X86_STACKTRACE_H */
|