AcoSail/kernel_optimize_test
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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fixes from Ingo Molnar:
 "Two small fixlets"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix interrupt handler timing harness
  perf/x86/amd: Do not print an error when the device is not present
This commit is contained in:
Linus Torvalds 2013-07-10 16:04:38 -07:00
commit a9642fa351
2 changed files with 3 additions and 5 deletions
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4
arch/x86/kernel/cpu/perf_event_amd_iommu.c
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@ -491,10 +491,8 @@ static struct perf_amd_iommu __perf_iommu = {
static __init int amd_iommu_pc_init(void)
{
/* Make sure the IOMMU PC resource is available */
if (!amd_iommu_pc_supported()) {
pr_err("perf: amd_iommu PMU not installed. No support!\n");
if (!amd_iommu_pc_supported())
return -ENODEV;
}
_init_perf_amd_iommu(&__perf_iommu, "amd_iommu");

4
kernel/events/core.c
View File

@ -182,7 +182,7 @@ void update_perf_cpu_limits(void)
u64 tmp = perf_sample_period_ns;
tmp *= sysctl_perf_cpu_time_max_percent;
tmp = do_div(tmp, 100);
do_div(tmp, 100);
atomic_set(&perf_sample_allowed_ns, tmp);
}
@ -232,7 +232,7 @@ DEFINE_PER_CPU(u64, running_sample_length);
void perf_sample_event_took(u64 sample_len_ns)
{
u64 avg_local_sample_len;
u64 local_samples_len = __get_cpu_var(running_sample_length);
u64 local_samples_len;
if (atomic_read(&perf_sample_allowed_ns) == 0)
return;