* Kernelnewbies Digest, Vol 17, Issue 44 [not found] <mailman.1.1335456001.26168.kernelnewbies@kernelnewbies.org> @ 2012-04-26 17:40 ` Jeshwanth Kumar N K Jeshu 2012-04-27 3:29 ` Arun KS 0 siblings, 1 reply; 2+ messages in thread From: Jeshwanth Kumar N K Jeshu @ 2012-04-26 17:40 UTC (permalink / raw) To: kernelnewbies 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, <kernelnewbies-request@kernelnewbies.org>wrote: > Send Kernelnewbies mailing list submissions to > kernelnewbies at kernelnewbies.org > > 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 > kernelnewbies-request at kernelnewbies.org > > You can reach the person managing the list at > kernelnewbies-owner at kernelnewbies.org > > 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 <daniel.baluta@gmail.com> > Subject: Re: Profiling my Modules > To: Rishi Agrawal <rishi.b.agrawal@gmail.com> > Cc: kernelnewbies at kernelnewbies.org > Message-ID: > <CAEnQRZCf1zjMAQSe8uuYTr7px6-K51fLpB+vwY3SMkDXimcpxw@mail.gmail.com > > > Content-Type: text/plain; charset=ISO-8859-1 > > On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal > <rishi.b.agrawal@gmail.com> 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 <bjorn@mork.no> > Subject: Re: Linux Driver Project > To: Rabee Al-Maqabi <rabee.almaqabi@gmail.com> > Cc: Javier Martinez Canillas <martinez.javier@gmail.com>, > kernelnewbies at kernelnewbies.org > Message-ID: <87fwbqeipg.fsf@nemi.mork.no> > Content-Type: text/plain; charset=utf-8 > > Rabee Al-Maqabi <rabee.almaqabi@gmail.com> 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 <rishi.b.agrawal@gmail.com> > Subject: Re: Profiling my Modules > To: Daniel Baluta <daniel.baluta@gmail.com> > Cc: kernelnewbies at kernelnewbies.org > Message-ID: > <CADDndfPtRis6CuXJN7D0v=snCJ8b_hS0eW2cQoBekXE3UtyXSw@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 <daniel.baluta@gmail.com > >wrote: > > > On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal > > <rishi.b.agrawal@gmail.com> 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 <bjorn@mork.no> > Subject: Re: Linux Driver Project > To: Rabee Al-Maqabi <rabee.almaqabi@gmail.com> > Cc: Javier Martinez Canillas <martinez.javier@gmail.com>, > kernelnewbies at kernelnewbies.org > Message-ID: <877gx2eh4h.fsf@nemi.mork.no> > Content-Type: text/plain; charset=utf-8 > > Bj?rn Mork <bjorn@mork.no> 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 <chris@basementcode.com> > Subject: freelance kernel work > To: <kernelnewbies@kernelnewbies.org> > Message-ID: <8acfa9e97f0b3bca53f505c1aca01aed@basementcode.com> > 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 > Kernelnewbies at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > End of Kernelnewbies Digest, Vol 17, Issue 44 > ********************************************* > -- Regards Jeshwanth Kumar N K +91-7411483498 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120426/71138959/attachment.html ^ permalink raw reply [flat|nested] 2+ messages in thread
* Kernelnewbies Digest, Vol 17, Issue 44 2012-04-26 17:40 ` Kernelnewbies Digest, Vol 17, Issue 44 Jeshwanth Kumar N K Jeshu @ 2012-04-27 3:29 ` Arun KS 0 siblings, 0 replies; 2+ messages in thread From: Arun KS @ 2012-04-27 3:29 UTC (permalink / raw) To: kernelnewbies Hi Jeshwanth, On Thu, Apr 26, 2012 at 11:10 PM, Jeshwanth Kumar N K Jeshu <jeshkumar555@gmail.com> wrote: > 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 ? Can you be more clear here. Are you talking about source code? Arun > > On Thu, Apr 26, 2012 at 9:30 PM, <kernelnewbies-request@kernelnewbies.org> > wrote: >> >> Send Kernelnewbies mailing list submissions to >> ? ? ? ?kernelnewbies at kernelnewbies.org >> >> 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 >> ? ? ? ?kernelnewbies-request at kernelnewbies.org >> >> You can reach the person managing the list at >> ? ? ? ?kernelnewbies-owner at kernelnewbies.org >> >> 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 <daniel.baluta@gmail.com> >> Subject: Re: Profiling my Modules >> To: Rishi Agrawal <rishi.b.agrawal@gmail.com> >> Cc: kernelnewbies at kernelnewbies.org >> Message-ID: >> >> ?<CAEnQRZCf1zjMAQSe8uuYTr7px6-K51fLpB+vwY3SMkDXimcpxw@mail.gmail.com> >> Content-Type: text/plain; charset=ISO-8859-1 >> >> On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal >> <rishi.b.agrawal@gmail.com> 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 <bjorn@mork.no> >> Subject: Re: Linux Driver Project >> To: Rabee Al-Maqabi <rabee.almaqabi@gmail.com> >> Cc: Javier Martinez Canillas <martinez.javier@gmail.com>, >> ? ? ? ?kernelnewbies at kernelnewbies.org >> Message-ID: <87fwbqeipg.fsf@nemi.mork.no> >> Content-Type: text/plain; charset=utf-8 >> >> Rabee Al-Maqabi <rabee.almaqabi@gmail.com> 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 <rishi.b.agrawal@gmail.com> >> Subject: Re: Profiling my Modules >> To: Daniel Baluta <daniel.baluta@gmail.com> >> Cc: kernelnewbies at kernelnewbies.org >> Message-ID: >> >> ?<CADDndfPtRis6CuXJN7D0v=snCJ8b_hS0eW2cQoBekXE3UtyXSw@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 >> <daniel.baluta@gmail.com>wrote: >> >> > On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal >> > <rishi.b.agrawal@gmail.com> 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 <bjorn@mork.no> >> Subject: Re: Linux Driver Project >> To: Rabee Al-Maqabi <rabee.almaqabi@gmail.com> >> Cc: Javier Martinez Canillas <martinez.javier@gmail.com>, >> ? ? ? ?kernelnewbies at kernelnewbies.org >> Message-ID: <877gx2eh4h.fsf@nemi.mork.no> >> Content-Type: text/plain; charset=utf-8 >> >> Bj?rn Mork <bjorn@mork.no> 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 <chris@basementcode.com> >> Subject: freelance kernel work >> To: <kernelnewbies@kernelnewbies.org> >> Message-ID: <8acfa9e97f0b3bca53f505c1aca01aed@basementcode.com> >> 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 >> Kernelnewbies at kernelnewbies.org >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> >> End of Kernelnewbies Digest, Vol 17, Issue 44 >> ********************************************* > > > > > -- > Regards > Jeshwanth Kumar N K > +91-7411483498 > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > ^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-04-26 17:40 ` Kernelnewbies Digest, Vol 17, Issue 44 Jeshwanth Kumar N K Jeshu
2012-04-27 3:29 ` Arun KS
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