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Bug fixes:

Browse Source 
- Initialize variables before use.
- Remove a KASSERT() that could falsely trigger if there are other sources
  of NMIs in the system.

Efficiency tweak:
- When checking PMCs that overflowed, ignore PMCs that were not configured for
  sampling.
This commit is contained in:
jkoshy 2008-12-16 11:04:02 +00:00
parent 8c8136db7e
commit 6fc1cf0348
1 changed files with 6 additions and 7 deletions
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13
sys/dev/hwpmc/hwpmc_core.c
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@ -1491,17 +1491,18 @@ core_intr(int cpu, struct trapframe *tf)
PMCDBG(MDP,INT, 1, "cpu=%d tf=0x%p um=%d", cpu, (void *) tf,
TRAPF_USERMODE(tf));
found_interrupt = 0;
cc = core_pcpu[cpu];
for (ri = 0; ri < core_iap_npmc; ri++) {
if (!iap_pmc_has_overflowed(ri))
continue;
if ((pm = cc->pc_corepmcs[ri].phw_pmc) == NULL ||
!PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
continue;
if (!iap_pmc_has_overflowed(ri))
continue;
found_interrupt = 1;
if (pm->pm_state != PMC_STATE_RUNNING)
@ -1560,7 +1561,9 @@ core2_intr(int cpu, struct trapframe *tf)
PMCDBG(MDP,INT, 1, "cpu=%d intrstatus=%jx", cpu,
(uintmax_t) intrstatus);
found_interrupt = 0;
cc = core_pcpu[cpu];
KASSERT(cc != NULL, ("[core,%d] null pcpu", __LINE__));
cc->pc_globalctrl &= ~intrenable;
@ -1574,7 +1577,6 @@ core2_intr(int cpu, struct trapframe *tf)
IA_GLOBAL_STATUS_FLAG_OVFBUF |
IA_GLOBAL_STATUS_FLAG_CONDCHG);
/*
* Look for interrupts from fixed function PMCs.
*/
@ -1634,9 +1636,6 @@ core2_intr(int cpu, struct trapframe *tf)
wrmsr(IAP_PMC0 + n, v);
}
KASSERT(found_interrupt,
("[core,%d] no interrupting PMCs were found", __LINE__));
/*
* Reenable all non-stalled PMCs.
*/