January 2011 - kernelnewbies@kernelnewbies.org

storing the messages at events
by mohit verma Jan. 31, 2011

Jan. 31, 2011

hi , my module produces some data (very cititcal) and that i want to log that to some disk residing file like log files. So among several ways like using syslog (and family) ,audit daemon i am not finding the way to use the functionalities of any of these subsystems .i mean : practically i am still unable to do that. can someone point me to some practical implementations used by some other modules or some practically sound articles to achieve this? thanks a lot in advance. -- ........................ *MOHIT VERMA* -- ........................ *MOHIT VERMA*

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Fwd: Permanent Delivery Failure
by mohit verma Jan. 31, 2011

Jan. 31, 2011

---------- Forwarded message ---------- From: MDaemon at fibcom.com <MDaemon(a)fibcom.com> Date: Mon, Jan 31, 2011 at 6:40 PM Subject: Permanent Delivery Failure To: mohit89mlnc(a)gmail.com The attached message had PERMANENT fatal delivery errors! After one or more unsuccessful delivery attempts the attached message has been removed from the mail queue on this server. The number and frequency of delivery attempts are determined by local configuration parameters. YOUR MESSAGE WAS NOT DELIVERED TO ANY OF IT'S RECIPIENTS! --- Session Transcript --- Mon 2011-01-31 18:40:37: Parsing message <xxxxxxxxxxxxxxxxxx\pd50001451601.msg> Mon 2011-01-31 18:40:37: * From: mohit89mlnc(a)gmail.com Mon 2011-01-31 18:40:37: * To: amit(a)fibcom.com Mon 2011-01-31 18:40:37: * Subject: storing the logs Mon 2011-01-31 18:40:37: * Message-ID: < AANLkTin7feriYDLgMZtazLQD%2ByOjU4hgxWs0_KxBSk9P(a)mail.gmail.com<AANLkTin7feriYDLgMZtazLQD%252ByOjU4hgxWs0_KxBSk9P(a)mail.gmail.com> > Mon 2011-01-31 18:40:37: * Route slip host: 202.71.129.104 Mon 2011-01-31 18:40:37: * Route slip port: 25 Mon 2011-01-31 18:40:37: Attempting SMTP connection to [202.71.129.104] Mon 2011-01-31 18:40:37: Attempting to send message to smart host Mon 2011-01-31 18:40:37: Attempting SMTP connection to [202.71.129.104:25] Mon 2011-01-31 18:40:37: Waiting for socket connection... Mon 2011-01-31 18:40:37: * Connection established (192.5.1.2:1395 -> 202.71.129.104:25) Mon 2011-01-31 18:40:37: Waiting for protocol to start... Mon 2011-01-31 18:40:37: <-- 220 smtp ready smtp.bizmail.net4india.com Mon 2011-01-31 18:40:37: --> EHLO fibcom.com Mon 2011-01-31 18:40:37: <-- 250-smtp.bizmail.net4india.com Hello fibcom.com [203.101.81.201] Mon 2011-01-31 18:40:37: <-- 250-SIZE 57671680 Mon 2011-01-31 18:40:37: <-- 250-PIPELINING Mon 2011-01-31 18:40:37: <-- 250 HELP Mon 2011-01-31 18:40:37: --> MAIL From:<mohit89mlnc(a)gmail.com> SIZE=5888 Mon 2011-01-31 18:40:37: <-- 250 OK Mon 2011-01-31 18:40:37: --> RCPT To:<amit(a)fibcom.com> Mon 2011-01-31 18:40:37: <-- 550 relay not permitted --- End Transcript --- -------------------------------------- LEGAL DISCLAIMER -------------------------------------- The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reproduction, dissemination or distribution of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. This mail has been checked for viruses. However recipients should undertake their own virus check. We will not be liable for any losses Thank you. Fibcom India Limited ---------- Forwarded message ---------- From: mohit verma <mohit89mlnc(a)gmail.com> To: kernelnewbies <kernelnewbies(a)nl.linux.org> Date: Mon, 31 Jan 2011 18:24:50 +0530 Subject: storing the logs hi , my module produces some data (very cititcal) and that i want to log that to some disk residing file like log files. So among several ways like using syslog (and family) ,audit daemon i am not finding the way to use the functionalities of any of these subsystems .i mean : practically i am still unable to do that. can someone point me to some practical implementations used by some other modules or some practically sound articles to achieve this? thanks a lot in advance. -- ........................ *MOHIT VERMA* _______________________________________________ Kernelnewbies mailing list Kernelnewbies(a)kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- ........................ *MOHIT VERMA*

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how to measure IRQ service latency
by Pradeep Kumar Jan. 31, 2011

Jan. 31, 2011

hi, can any one suggest a way to measure IRQ service latency? . thanks -- Goudagunta Pradeep Kumar,

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can we measure the traffic between user and kernel mode
by loody Jan. 31, 2011

Jan. 31, 2011

Dear all: Is there any directory under proc/sys or tools that can help us to measure the traffic between user and kernel mode? (such as ioctl, open, close, etc.) -- Regards, miloody

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motivation behind pr_xxx macros
by Himanshu Aggarwal Jan. 30, 2011

Jan. 30, 2011

While writing some code on 2.6.32, I have come across some of these macros that in turn call printk: pr_emerg pr_alert ... pr_debug Is there any case when should these macros be preferred over explicit printk statements? What is the motivation behind providing these macros when this task can already be accomplished by using printk statements explicitly with priority levels? Regards, Himanshu

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page size change on MIPS
by naveen yadav Jan. 30, 2011

Jan. 30, 2011

Hi All, we are using mips32r2 so I want to know which all pages size it can support? When I modify arch/mips/Kconfig. it boot sucessfully on 16KB page size. but hang/not boot crash when change page size to 8KB,32KB and 64 KB. We are using 2.6.30 kernel. At Page Size 8KB and 32KB it hang in unpack_to_rootfs() function of init/initramfs.c 64KB it hangs when execute init Kernel panic - not syncing: Attempted to kill init! config PAGE_SIZE_4KB bool "4kB" help This option select the standard 4kB Linux page size. On some R3000-family processors this is the only available page size. Using 4kB page size will minimize memory consumption and is therefore recommended for low memory systems. config PAGE_SIZE_8KB bool "8kB" depends on (EXPERIMENTAL && CPU_R8000) || CPU_CAVIUM_OCTEON help Using 8kB page size will result in higher performance kernel at the price of higher memory consumption. This option is available only on R8000 and cnMIPS processors. Note that you will need a suitable Linux distribution to support this. config PAGE_SIZE_16KB bool "16kB" depends on !CPU_R3000 && !CPU_TX39XX help Using 16kB page size will result in higher performance kernel at the price of higher memory consumption. This option is available on all non-R3000 family processors. Note that you will need a suitable Linux distribution to support this. config PAGE_SIZE_32KB bool "32kB" help Using 32kB page size will result in higher performance kernel at the price of higher memory consumption. This option is available only on cnMIPS cores. Note that you will need a suitable Linux distribution to support this. config PAGE_SIZE_64KB bool "64kB" depends on EXPERIMENTAL && !CPU_R3000 && !CPU_TX39XX help Using 64kB page size will result in higher performance kernel at the price of higher memory consumption. This option is available on all non-R3000 family processor. Not that at the time of this writing this option is still high experimental.

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How to identity processor architecture
by prabhu Jan. 30, 2011

Jan. 30, 2011

Hi Dear, I just wanna to know my processor architecture(32bit or 64 bit) through c programming. According to me the sizeof of pointer will give the result. Like below coding. int main() { int *ptr; printf("%d",sizeof(ptr)); } Please correct me if i am wrong... Any suggestion or help would be appreciated. Thanks, Prabhu

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if you're in ottawa this tuesday, come out and say hi
by Robert P. J. Day Jan. 30, 2011

Jan. 30, 2011

i'm giving a short presentation at the ottawa linux users group this tuesday evening: http://oclug.on.ca/meeting/70/ so if you're in the area, drop by and introduce yourself. rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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Re: Creating the same random numbers
by Andreas Leppert Jan. 30, 2011

Jan. 30, 2011

On Sat, Jan 29, 2011 at 07:59:34PM +0000, creslin(a)gmail.com wrote: > But in short answer yes, if you use the same seed the same answer > would be generated, assuming no further entropy is used later I.e > dependent on method employed to expand. Though then the 'randomness' > is in the seed not the output. Its this capability which allows simple > access control token devices to operate. > I'm not quite familiar with the number generators in the kernel. Right now I do this to get a random number betwen min and max: /* compute the random value within the given min and max wrt to step */ int tmp_bytes, range; range = max - min + 1; get_random_bytes(&tmp_bytes, sizeof(tmp_bytes)); if (0 > tmp_bytes) tmp_bytes = -tmp_bytes; new_random_param->curval = tmp_bytes % range + min; You mentioned the seed value. Is there a way to set a seed value before I invoke get_random_bytes? Could you direct me to a page / source file where I can get more information about it? Thanks for all responses so long! Andreas Leppert

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Re: Creating the same random numbers
by Andreas Leppert Jan. 30, 2011

Jan. 30, 2011

Hi Danny, On Sat, Jan 29, 2011 at 07:59:34PM +0000, creslin(a)gmail.com wrote: > Why not simply copy the sequence generated if you need the same? > Because it would be easier to have something like srand(seed) and later on rand() instead of managing a list of generated numbers etc. Of course, providing a list of generated data could be a solution.

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