Messages in this thread Patch in this message |  | | | From | Robert Richter <> | | Subject | [PATCH 09/10] perf, x86: Improve debug output in check_hw_exists() | | Date | Tue, 19 Jun 2012 20:10:47 +0200 |
| |
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 1d59cac..8ab4e5a 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -175,7 +175,7 @@ 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; /* @@ -226,6 +226,7 @@ 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
|  |