The branch stable/13 has been updated by mhorne:
URL:
https://cgit.FreeBSD.org/src/commit/?id=112e30301846d8fede4679a3f95e18820d721bbd
commit 112e30301846d8fede4679a3f95e18820d721bbd
Author: Mitchell Horne <mho...@freebsd.org>
AuthorDate: 2021-04-21 20:28:12 +0000
Commit: Mitchell Horne <mho...@freebsd.org>
CommitDate: 2021-04-29 13:19:20 +0000
pmcstat: set initial counter value to zero
For an infrequent event, pmcstat may report (u_long)-1 for CPUs where
the counter was never incremented. Just set this to zero, instead.
ev->ev_count is passed as the 'count' argument to pmc_allocate(3), but
this wasn't always the case.
Reviewed by: gnn
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29887
(cherry picked from commit edcf9e59c356525632dd2546d72916aeca609a2b)
---
usr.sbin/pmcstat/pmcstat.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/usr.sbin/pmcstat/pmcstat.c b/usr.sbin/pmcstat/pmcstat.c
index 688a98843652..b7f6c5e0f63e 100644
--- a/usr.sbin/pmcstat/pmcstat.c
+++ b/usr.sbin/pmcstat/pmcstat.c
@@ -675,7 +675,7 @@ main(int argc, char **argv)
if (option == 'S' || option == 'P')
ev->ev_count = current_sampling_count ?
current_sampling_count : pmc_pmu_sample_rate_get(ev->ev_spec);
else
- ev->ev_count = -1;
+ ev->ev_count = 0;
if (option == 'S' || option == 's')
ev->ev_cpu = CPU_FFS(&cpumask) - 1;
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