linux-kernel - Re: [PATCH 01/13] HW-latency: hardware latency test 0.10

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Date:	Mon, 5 Nov 2012 07:20:43 -0500
From:	Luming Yu <luming.yu@...il.com>
To:	John Kacur <jkacur@...hat.com>
Cc:	Jon Masters <jonathan@...masters.org>,
	Jon Masters <jcm@...hat.com>, arnd@...db.de,
	linux-kernel@...r.kernel.org, Luming Yu <luming.yu@...el.com>
Subject: Re: [PATCH 01/13] HW-latency: hardware latency test 0.10

On Sun, Nov 4, 2012 at 4:23 PM, John Kacur <jkacur@...hat.com> wrote:
> On Mon, Nov 5, 2012 at 2:59 AM, Luming Yu <luming.yu@...il.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.yu@...el.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.yu@...il.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
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