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perf trace: Use a constant for the syscall formatting buffer 

We were using it as a magic number, 1024, fix that.

Eventually we need to stop doing it per line, and do it per
arg, traversing the args at output time, to avoid the memmove()
calls that will be used in the next cset to replace pointers
present at raw_syscalls:sys_enter time with its contents that
appear at probe:vfs_getname time, before raw_syscalls:sys_exit
time.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Milian Wolff <mail@milianw.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-4sz3wid39egay1pp8qmbur4u@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-08-04 22:17:29 -03:00
parent 08c987763a
commit e4d44e830a
1 changed files with 5 additions and 3 deletions
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8
tools/perf/builtin-trace.c
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@ -1262,6 +1262,8 @@ static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
#define TRACE_PFMAJ (1 << 0)
#define TRACE_PFMIN (1 << 1)
static const size_t trace__entry_str_size = 2048;
struct trace {
struct perf_tool tool;
struct {
@ -1822,7 +1824,7 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
args = perf_evsel__sc_tp_ptr(evsel, args, sample);
if (ttrace->entry_str == NULL) {
ttrace->entry_str = malloc(1024);
ttrace->entry_str = malloc(trace__entry_str_size);
if (!ttrace->entry_str)
goto out_put;
}
@ -1832,9 +1834,9 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
ttrace->entry_time = sample->time;
msg = ttrace->entry_str;
printed += scnprintf(msg + printed, 1024 - printed, "%s(", sc->name);
printed += scnprintf(msg + printed, trace__entry_str_size - printed, "%s(", sc->name);
printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed,
printed += syscall__scnprintf_args(sc, msg + printed, trace__entry_str_size - printed,
args, trace, thread);
if (sc->is_exit) {