Messages in this thread Patch in this message | | | From | Robert Richter <> | Subject | [PATCH 4/4] perf, x86: Improve debug output in check_hw_exists() | Date | Wed, 20 Jun 2012 20:46:36 +0200 |
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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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