On Sun, Nov 4, 2012 at 4:23 PM, John Kacur <jka...@redhat.com> wrote:
> On Mon, Nov 5, 2012 at 2:59 AM, Luming Yu <luming...@gmail.com> wrote:
>>
>> This patch is the first step to test some basic hardware functions like
>> TSC to help people understand if there is any hardware latency as well
>> as throughput problem exposed on bare metal or left behind by BIOS or
>> interfered by SMI. Currently the patch tests TSC, CPU Frequency and
>> RDRAND which is a new CPU instruction to get random number introduced in
>> new CPU like Intel Ivy Bridge in stop_machine context,which is choosen to
>> make sure testers fully control their system under test to rule out some
>> level of unwanted noise.
>>
>> Signed-off-by: Luming Yu <luming...@intel.com>
>> ---
>> drivers/misc/Kconfig | 7 +
>> drivers/misc/Makefile | 1 +
>> drivers/misc/hw_latency_test.c | 833
>> +++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 841 insertions(+)
>> create mode 100644 drivers/misc/hw_latency_test.c
>>
>> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
>> index b151b7c..5ed440b 100644
>> --- a/drivers/misc/Kconfig
>> +++ b/drivers/misc/Kconfig
>> @@ -114,6 +114,13 @@ config IBM_ASM
>> for information on the specific driver level and support statement
>> for your IBM server.
>>
>> +config HW_LATENCY_TEST
>> + tristate "Testing module to detect hardware lattency and throughput"
>> + depends on DEBUG_FS
>> + depends on RING_BUFFER
>> + depends on X86
>> + default m
>> +
>> config PHANTOM
>> tristate "Sensable PHANToM (PCI)"
>> depends on PCI
>> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
>> index 2129377..c195cce 100644
>> --- a/drivers/misc/Makefile
>> +++ b/drivers/misc/Makefile
>> @@ -49,3 +49,4 @@ obj-y += carma/
>> obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
>> obj-$(CONFIG_ALTERA_STAPL) +=altera-stapl/
>> obj-$(CONFIG_INTEL_MEI) += mei/
>> +obj-$(CONFIG_HW_LATENCY_TEST) += hw_latency_test.o
>> diff --git a/drivers/misc/hw_latency_test.c b/drivers/misc/hw_latency_test.c
>> new file mode 100644
>> index 0000000..2aa3a74
>> --- /dev/null
>> +++ b/drivers/misc/hw_latency_test.c
>> @@ -0,0 +1,833 @@
>> +#include <linux/module.h>
>> +#include <linux/init.h>
>> +#include <linux/ring_buffer.h>
>> +#include <linux/stop_machine.h>
>> +#include <linux/time.h>
>> +#include <linux/hrtimer.h>
>> +#include <linux/kthread.h>
>> +#include <linux/debugfs.h>
>> +#include <linux/seq_file.h>
>> +#include <linux/uaccess.h>
>> +#include <linux/version.h>
>> +#include <linux/delay.h>
>> +#include <linux/slab.h>
>> +#include <linux/random.h>
>> +#include <asm/tlbflush.h>
>> +
>> +#define BUF_SIZE_DEFAULT 262144UL
>> +#define BUF_FLAGS (RB_FL_OVERWRITE)
>> +#define U64STR_SIZE 22
>> +#define DEBUGFS_BUF_SIZE 1024
>> +#define DEBUGFS_NAME_SIZE 32
>> +
>> +#define VERSION "0.1.0"
>> +#define BANNER "hardware latency test"
>> +#define DRVNAME "hw_latency_test"
>> +
>> +#define DEFAULT_SAMPLE_WINDOW 1000000
>> +#define DEFAULT_SAMPLE_WIDTH 500000
>> +#define DEFAULT_LAT_THRESHOLD 10
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Luming Yu <luming...@gmail.com>");
>> +MODULE_DESCRIPTION("A simple hardware latency test");
>> +MODULE_VERSION(VERSION);
>
>
> -------->o SNIP
>
> Ok, hopefully this is just an unintentional oversight - but I don't
> see where you are acknowledging that the original author of most of
> this code is Jon Masters. It's fine for you to work on it, but you
> have to somewhere acknowledge where it comes from.
Thanks very much for pointing it out.
I did ACK Jon Masters in the first push of this feature in July of this year.
Yes, I will add Jon Master to be the first author of the work in right
place, I will
claim secondary place for myself . :-)
>
> Thanks
>
> John
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
