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Subject[PATCH 4/4] perf, x86: Improve debug output in check_hw_exists()
Date
It might be of interest which perfctr msr failed.

Signed-off-by: Robert Richter <robert.richter@amd.com>
---
arch/x86/kernel/cpu/perf_event.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index bb340dc..8d29a35 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -178,7 +178,7 @@ static void release_pmc_hardware(void) {}

static bool check_hw_exists(void)
{
- u64 val, val_new = 0;
+ u64 val, val_new = ~0;
int i, reg, ret = 0;

/*
@@ -229,6 +229,7 @@ bios_fail:

msr_fail:
printk(KERN_CONT "Broken PMU hardware detected, using software events only.\n");
+ printk(KERN_ERR "Failed to access perfctr msr (MSR %x is %Lx)\n", reg, val_new);

return false;
}
--
1.7.8.4



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