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perf probe: Improve detection of file/function name in the probe pattern 

Currently, perf probe considers patterns including a '.' to be a file.
However, this causes problems on powerpc ABIv1 where all functions have
a leading '.':

  $ perf probe -F | grep schedule_timeout_interruptible
  .schedule_timeout_interruptible
  $ perf probe .schedule_timeout_interruptible
  Semantic error :File always requires line number or lazy pattern.
    Error: Command Parse Error.

Fix this:
- by checking the probe pattern in more detail, and
- skipping leading dot if one exists when creating/deleting events.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/db680f7cb11c4452b632f908e67151f3aa0f4602.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Naveen N. Rao 2015-04-28 17:35:34 +05:30 committed by Arnaldo Carvalho de Melo
parent 539f3aa2eb
commit 3099c02600
1 changed files with 26 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
tools/perf/util/probe-event.c
View File

@ -1077,6 +1077,7 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
struct perf_probe_point *pp = &pev->point;
char *ptr, *tmp;
char c, nc = 0;
bool file_spec = false;
/*
* <Syntax>
* perf probe [EVENT=]SRC[:LN|;PTN]
@ -1105,6 +1106,23 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
arg = tmp;
}
/*
* Check arg is function or file name and copy it.
*
* We consider arg to be a file spec if and only if it satisfies
* all of the below criteria::
* - it does not include any of "+@%",
* - it includes one of ":;", and
* - it has a period '.' in the name.
*
* Otherwise, we consider arg to be a function specification.
*/
if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
/* This is a file spec if it includes a '.' before ; or : */
if (memchr(arg, '.', ptr - arg))
file_spec = true;
}
ptr = strpbrk(arg, ";:+@%");
if (ptr) {
nc = *ptr;
@ -1115,10 +1133,9 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
if (tmp == NULL)
return -ENOMEM;
/* Check arg is function or file and copy it */
if (strchr(tmp, '.')) /* File */
if (file_spec)
pp->file = tmp;
else /* Function */
else
pp->function = tmp;
/* Parse other options */
@ -2265,6 +2282,9 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
{
int i, ret;
if (*base == '.')
base++;
/* Try no suffix */
ret = e_snprintf(buf, len, "%s", base);
if (ret < 0) {
@ -2766,6 +2786,9 @@ int del_perf_probe_events(struct strlist *dellist)
event = str;
}
if (event && *event == '.')
event++;
ret = e_snprintf(buf, 128, "%s:%s", group, event);
if (ret < 0) {
pr_err("Failed to copy event.");