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perf evlist: Introduce perf_evlist__strerror_tp method 

Out of 'perf trace', should be used by other tools that uses
tracepoints.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ramkumar Ramachandra <artagnon@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-lyvtxhchz4ga8fwht15x8wou@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2013-10-17 12:07:58 -03:00
parent ba209f8563
commit 6ef068cb8e
3 changed files with 34 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
tools/perf/builtin-trace.c
View File

@ -1814,27 +1814,11 @@ out:
trace->live = false; trace->live = false;
return err; return err;
out_error_tp: out_error_tp:
switch(errno) { {
case ENOENT: char errbuf[BUFSIZ];
fputs("Error:\tUnable to find debugfs\n" perf_evlist__strerror_tp(evlist, errno, errbuf, sizeof(errbuf));
"Hint:\tWas your kernel was compiled with debugfs support?\n" fprintf(trace->output, "%s\n", errbuf);
"Hint:\tIs the debugfs filesystem mounted?\n" }
"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'\n",
trace->output);
break;
case EACCES:
fprintf(trace->output,
"Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
debugfs_mountpoint, debugfs_mountpoint);
break;
default: {
char bf[256];
fprintf(trace->output, "Can't trace: %s\n",
strerror_r(errno, bf, sizeof(bf)));
}
break;
}
goto out_delete_evlist; goto out_delete_evlist;
} }

27
tools/perf/util/evlist.c
View File

@ -1126,3 +1126,30 @@ size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp)
return printed + fprintf(fp, "\n");; return printed + fprintf(fp, "\n");;
} }
int perf_evlist__strerror_tp(struct perf_evlist *evlist __maybe_unused,
int err, char *buf, size_t size)
{
char sbuf[128];
switch (err) {
case ENOENT:
scnprintf(buf, size, "%s",
"Error:\tUnable to find debugfs\n"
"Hint:\tWas your kernel was compiled with debugfs support?\n"
"Hint:\tIs the debugfs filesystem mounted?\n"
"Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
break;
case EACCES:
scnprintf(buf, size,
"Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
"Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
debugfs_mountpoint, debugfs_mountpoint);
break;
default:
scnprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
break;
}
return 0;
}

2
tools/perf/util/evlist.h
View File

@ -168,6 +168,8 @@ static inline struct perf_evsel *perf_evlist__last(struct perf_evlist *evlist)
size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp); size_t perf_evlist__fprintf(struct perf_evlist *evlist, FILE *fp);
int perf_evlist__strerror_tp(struct perf_evlist *evlist, int err, char *buf, size_t size);
static inline unsigned int perf_mmap__read_head(struct perf_mmap *mm) static inline unsigned int perf_mmap__read_head(struct perf_mmap *mm)
{ {
struct perf_event_mmap_page *pc = mm->base; struct perf_event_mmap_page *pc = mm->base;