d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

hwpmc: Reenable PME before reenabling counters.

Browse Source 
Doing otherwise may lead to lost interrupts, that in combination
with hardware PMCs freezing may leave them frozen forever.  It may
also slightly improve profiling accuracy.

MFC after:	2 weeks
This commit is contained in:
Alexander Motin 2022-06-15 11:39:37 -04:00
parent 918505d0a0
commit f9e62419f6
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
sys/dev/hwpmc/hwpmc_core.c
View File

@ -1204,6 +1204,9 @@ core2_intr(struct trapframe *tf)
else
counter_u64_add(pmc_stats.pm_intr_ignored, 1);
if (found_interrupt)
lapic_reenable_pmc();
/*
* Reenable all non-stalled PMCs.
*/
@ -1224,9 +1227,6 @@ core2_intr(struct trapframe *tf)
(uintmax_t) rdmsr(IA_GLOBAL_CTRL),
(uintmax_t) rdmsr(IA_GLOBAL_STATUS));
if (found_interrupt)
lapic_reenable_pmc();
return (found_interrupt);
}