perf probe: Add group name support
Allow user to set group name for adding new event. Note that user must ensure that the group name doesn't conflict with existing group name carefully. E.g. Existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide kernel embedded events when loading modules. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/146736024091.27797.9471545190066268995.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -143,16 +143,18 @@ PROBE SYNTAX
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Probe points are defined by following syntax.
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Probe points are defined by following syntax.
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1) Define event based on function name
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1) Define event based on function name
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[EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
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[[GROUP:]EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
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2) Define event based on source file with line number
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2) Define event based on source file with line number
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[EVENT=]SRC:ALN [ARG ...]
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[[GROUP:]EVENT=]SRC:ALN [ARG ...]
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3) Define event based on source file with lazy pattern
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3) Define event based on source file with lazy pattern
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[EVENT=]SRC;PTN [ARG ...]
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[[GROUP:]EVENT=]SRC;PTN [ARG ...]
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'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. Currently, event group name is set as 'probe'.
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'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe.
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Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the
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modules.
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'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition. In addition, '@SRC' specifies a source file which has that function.
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'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition. In addition, '@SRC' specifies a source file which has that function.
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It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
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It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
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'ARG' specifies the arguments of this probe point, (see PROBE ARGUMENT).
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'ARG' specifies the arguments of this probe point, (see PROBE ARGUMENT).
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@ -1206,10 +1206,8 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
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bool file_spec = false;
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bool file_spec = false;
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/*
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/*
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* <Syntax>
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* <Syntax>
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* perf probe [EVENT=]SRC[:LN|;PTN]
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* perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
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* perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
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* perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
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*
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* TODO:Group name support
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*/
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*/
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if (!arg)
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if (!arg)
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return -EINVAL;
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return -EINVAL;
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@ -1218,11 +1216,19 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
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if (ptr && *ptr == '=') { /* Event name */
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if (ptr && *ptr == '=') { /* Event name */
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*ptr = '\0';
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*ptr = '\0';
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tmp = ptr + 1;
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tmp = ptr + 1;
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if (strchr(arg, ':')) {
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ptr = strchr(arg, ':');
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semantic_error("Group name is not supported yet.\n");
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if (ptr) {
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return -ENOTSUP;
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*ptr = '\0';
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}
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if (!is_c_func_name(arg))
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goto not_fname;
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pev->group = strdup(arg);
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if (!pev->group)
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return -ENOMEM;
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arg = ptr + 1;
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} else
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pev->group = NULL;
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if (!is_c_func_name(arg)) {
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if (!is_c_func_name(arg)) {
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not_fname:
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semantic_error("%s is bad for event name -it must "
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semantic_error("%s is bad for event name -it must "
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"follow C symbol-naming rule.\n", arg);
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"follow C symbol-naming rule.\n", arg);
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return -EINVAL;
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return -EINVAL;
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@ -1230,7 +1236,6 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
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pev->event = strdup(arg);
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pev->event = strdup(arg);
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if (pev->event == NULL)
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if (pev->event == NULL)
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return -ENOMEM;
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return -ENOMEM;
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pev->group = NULL;
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arg = tmp;
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arg = tmp;
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}
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}
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