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author | Adrian Hunter <adrian.hunter@intel.com> | 2014-10-30 17:09:45 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-11-03 23:43:56 +0300 |
commit | 92a9e4f7db89a013e1bdef2e548928fc71e9867c (patch) | |
tree | a177ee83d628da5379ffbafbf32faabe5c5cbf94 /tools/perf/util/thread-stack.h | |
parent | 00447ccdf3335ea467841fc3c7d65ffd30748895 (diff) | |
download | linux-92a9e4f7db89a013e1bdef2e548928fc71e9867c.tar.xz |
perf tools: Enhance the thread stack to output call/return data
Enhance the thread stack to output detailed information about paired
calls and returns.
The enhanced processing consumes sample information via
thread_stack__process() and outputs information about paired calls /
returns via a call-back.
While the call-back makes it possible for the facility to be used by
arbitrary tools, a subsequent patch will provide the information to
Python scripting via the db-export interface.
An important part of the call/return information is the
call path which provides a structure that defines a context
sensitive call graph.
Note that there are now two ways to use the thread stack.
For simply providing a call stack (like you would get from the perf
record -g option) the interface consists of thread_stack__event() and
thread_stack__sample().
Whereas the enhanced interface consists of call_return_processor__new()
and thread_stack__process().
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1414678188-14946-5-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/thread-stack.h')
-rw-r--r-- | tools/perf/util/thread-stack.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/tools/perf/util/thread-stack.h b/tools/perf/util/thread-stack.h index 7c41579aec74..b843bbef8ba2 100644 --- a/tools/perf/util/thread-stack.h +++ b/tools/perf/util/thread-stack.h @@ -19,14 +19,93 @@ #include <sys/types.h> #include <linux/types.h> +#include <linux/rbtree.h> struct thread; +struct comm; struct ip_callchain; +struct symbol; +struct dso; +struct call_return_processor; +struct comm; +struct perf_sample; +struct addr_location; + +/* + * Call/Return flags. + * + * CALL_RETURN_NO_CALL: 'return' but no matching 'call' + * CALL_RETURN_NO_RETURN: 'call' but no matching 'return' + */ +enum { + CALL_RETURN_NO_CALL = 1 << 0, + CALL_RETURN_NO_RETURN = 1 << 1, +}; + +/** + * struct call_return - paired call/return information. + * @thread: thread in which call/return occurred + * @comm: comm in which call/return occurred + * @cp: call path + * @call_time: timestamp of call (if known) + * @return_time: timestamp of return (if known) + * @branch_count: number of branches seen between call and return + * @call_ref: external reference to 'call' sample (e.g. db_id) + * @return_ref: external reference to 'return' sample (e.g. db_id) + * @db_id: id used for db-export + * @flags: Call/Return flags + */ +struct call_return { + struct thread *thread; + struct comm *comm; + struct call_path *cp; + u64 call_time; + u64 return_time; + u64 branch_count; + u64 call_ref; + u64 return_ref; + u64 db_id; + u32 flags; +}; + +/** + * struct call_path - node in list of calls leading to a function call. + * @parent: call path to the parent function call + * @sym: symbol of function called + * @ip: only if sym is null, the ip of the function + * @db_id: id used for db-export + * @in_kernel: whether function is a in the kernel + * @rb_node: node in parent's tree of called functions + * @children: tree of call paths of functions called + * + * In combination with the call_return structure, the call_path structure + * defines a context-sensitve call-graph. + */ +struct call_path { + struct call_path *parent; + struct symbol *sym; + u64 ip; + u64 db_id; + bool in_kernel; + struct rb_node rb_node; + struct rb_root children; +}; int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip, u64 to_ip, u16 insn_len, u64 trace_nr); +void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr); void thread_stack__sample(struct thread *thread, struct ip_callchain *chain, size_t sz, u64 ip); void thread_stack__free(struct thread *thread); +struct call_return_processor * +call_return_processor__new(int (*process)(struct call_return *cr, void *data), + void *data); +void call_return_processor__free(struct call_return_processor *crp); +int thread_stack__process(struct thread *thread, struct comm *comm, + struct perf_sample *sample, + struct addr_location *from_al, + struct addr_location *to_al, u64 ref, + struct call_return_processor *crp); + #endif |