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Subject[PATCH v6 2/4] tools/perf: extend format_alias() to include event parameters
Date
From: Cody P Schafer <cody@linux.vnet.ibm.com>

This causes `perf list pmu` to show parameters for parameterized events
like:

pmu/event_name,param1=?,param2=?/ [Kernel PMU event]

An example:

hv_24x7/HPM_TLBIE__PHYS_CORE,core=?/ [Kernel PMU event]

Changelog[v6]
[Jir Olsa, Sukadev Bhattiprolu] Drop the '$' sign and go back to
just printing whatevever sysfs provides (which is '=?') to identify
required parameters. sysfs also now uses parameters like 'core'
and 'vcpu' rather than 'starting_index'.

Changelog[v5]
[Jiri Olsa, Peter Zijlstra] Use '$' to prefix parameterized events.

Changelog[v4]
[Jiri Olsa] If the parameter for an event in sysfs is 'param=val',
have perf-list show the event as 'param=?' rather than 'val=?'.

CC: Haren Myneni <hbabu@us.ibm.com>
CC: Cody P Schafer <dev@codyps.com>
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
tools/perf/util/pmu.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index cb516dd..d208fef 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -810,10 +810,35 @@ void perf_pmu__set_format(unsigned long *bits, long from, long to)
set_bit(b, bits);
}

+static int sub_non_neg(int a, int b)
+{
+ if (b > a)
+ return 0;
+ return a - b;
+}
+
static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
struct perf_pmu_alias *alias)
{
- snprintf(buf, len, "%s/%s/", pmu->name, alias->name);
+ struct parse_events_term *term;
+ int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
+
+ list_for_each_entry(term, &alias->terms, list)
+ if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
+ used += snprintf(buf + used, sub_non_neg(len, used),
+ ",%s=%s", term->config,
+ term->val.str);
+
+ if (sub_non_neg(len, used) > 0) {
+ buf[used] = '/';
+ used++;
+ }
+ if (sub_non_neg(len, used) > 0) {
+ buf[used] = '\0';
+ used++;
+ } else
+ buf[len - 1] = '\0';
+
return buf;
}

--
1.8.3.1


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