Hello guys, I am writing a user space code for pwm controller in beaglebone, but the drivers are in the form of files, so when I am writing the code I got a doubt that, if we keep access the files it may take more processor time so any other way is there to access or this is the best way ?
On Thu, Apr 26, 2012 at 9:30 PM, <[email protected]>wrote: > Send Kernelnewbies mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Kernelnewbies digest..." > > > Today's Topics: > > 1. Re: Profiling my Modules (Daniel Baluta) > 2. Re: Linux Driver Project (Bj?rn Mork) > 3. Re: Profiling my Modules (Rishi Agrawal) > 4. Re: Linux Driver Project (Bj?rn Mork) > 5. freelance kernel work (Christopher Harvey) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 26 Apr 2012 15:42:57 +0300 > From: Daniel Baluta <[email protected]> > Subject: Re: Profiling my Modules > To: Rishi Agrawal <[email protected]> > Cc: [email protected] > Message-ID: > <caenqrzcf1zjmaqse8uuytr7px6-k51flpb+vwy3smkdximc...@mail.gmail.com > > > Content-Type: text/plain; charset=ISO-8859-1 > > On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal > <[email protected]> wrote: > > Hi All, > > > > I have a kernel module which has functions which take a lot of time in > > execution. I am curious to know how can I profile it, and find out the > > functions taking most of the time. > > > > I saw Oprofile, but it seems that I will have to build the whole kernel, > and > > also that it will be difficult to profile my module through it. > > > > Any trick or tool will do. > > Hello, > > Have a look at perf [1]. > > thanks, > Daniel. > > [1] https://perf.wiki.kernel.org/ > > > > ------------------------------ > > Message: 2 > Date: Thu, 26 Apr 2012 15:16:59 +0200 > From: Bj?rn Mork <[email protected]> > Subject: Re: Linux Driver Project > To: Rabee Al-Maqabi <[email protected]> > Cc: Javier Martinez Canillas <[email protected]>, > [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=utf-8 > > Rabee Al-Maqabi <[email protected]> writes: > > > Thank you for your reply. Linux Device Drivers is indeed a great book. I > > have read it in addition to Understanding the Linux Kernel and I have > > experimented with my Linux box. At this point, I would like to have a > > real-world experience and write a driver for a piece of hardware not yet > > supported. > > How about a fingerprint scanner? If you've got a modern laptop then > chances are good that you already own such a device. And it's > most likely unsupported. Some might say that's because it's useless :-) > > Otherwise I'd recommend looking through your box of unused devices. No > need to go out and buy anything if all you want is to write some > driver. > > Or see > http://www.linuxdriverproject.org/foswiki/bin/view/Main/DriversNeeded > if you are open to buying some new device for this project. > > You won't find any datasheets or any other documentation, though... > Manufacturers smart enough to provide documentation usually get drivers > written for their devices in no time. But some still hold it to > themselves. Go figure. > > > Bj?rn > > > > ------------------------------ > > Message: 3 > Date: Thu, 26 Apr 2012 19:01:00 +0530 > From: Rishi Agrawal <[email protected]> > Subject: Re: Profiling my Modules > To: Daniel Baluta <[email protected]> > Cc: [email protected] > Message-ID: > <CADDndfPtRis6CuXJN7D0v=sncj8b_hs0ew2cqobekxe3uty...@mail.gmail.com > > > Content-Type: text/plain; charset="iso-8859-1" > > Thanks a lot, I will have a look at it and see if it helps. > > On Thu, Apr 26, 2012 at 6:12 PM, Daniel Baluta <[email protected] > >wrote: > > > On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal > > <[email protected]> wrote: > > > Hi All, > > > > > > I have a kernel module which has functions which take a lot of time in > > > execution. I am curious to know how can I profile it, and find out the > > > functions taking most of the time. > > > > > > I saw Oprofile, but it seems that I will have to build the whole > kernel, > > and > > > also that it will be difficult to profile my module through it. > > > > > > Any trick or tool will do. > > > > Hello, > > > > Have a look at perf [1]. > > > > thanks, > > Daniel. > > > > [1] https://perf.wiki.kernel.org/ > > > > > > -- > Regards, > Rishi Agrawal > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120426/213b0716/attachment-0001.html > > ------------------------------ > > Message: 4 > Date: Thu, 26 Apr 2012 15:51:10 +0200 > From: Bj?rn Mork <[email protected]> > Subject: Re: Linux Driver Project > To: Rabee Al-Maqabi <[email protected]> > Cc: Javier Martinez Canillas <[email protected]>, > [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=utf-8 > > Bj?rn Mork <[email protected]> writes: > > > How about a fingerprint scanner? If you've got a modern laptop then > > chances are good that you already own such a device. And it's > > most likely unsupported. Some might say that's because it's useless :-) > > Sorry, please ignore this. I should have read > http://www.linuxdriverproject.org/foswiki/bin/view/Main/NoLinuxDriverNeeded > first. > > > Bj?rn > > > > ------------------------------ > > Message: 5 > Date: Thu, 26 Apr 2012 10:39:41 -0500 > From: Christopher Harvey <[email protected]> > Subject: freelance kernel work > To: <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=UTF-8; format=flowed > > I'm not looking for work, nor do I have any work for others. I'm just > curious if there is a central location where freelance kernel > developers hang out. I've never seen any email on mailing lists like > "I have some hardware and want somebody to write a kernel module for > it". I thought that sort of request would have been common. > > > > ------------------------------ > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > End of Kernelnewbies Digest, Vol 17, Issue 44 > ********************************************* > -- Regards Jeshwanth Kumar N K +91-7411483498
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