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 ?
--
Regards
Jeshwanth Kumar N K
+91-7411483498
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@xxxxxxxxxxxxxxxxx> wrote:
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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@xxxxxxxxx>
Subject: Re: Profiling my Modules
To: Rishi Agrawal <rishi.b.agrawal@xxxxxxxxx>
Cc: kernelnewbies@xxxxxxxxxxxxxxxxx
Message-ID:
<CAEnQRZCf1zjMAQSe8uuYTr7px6-K51fLpB+vwY3SMkDXimcpxw@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal
<rishi.b.agrawal@xxxxxxxxx> 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@xxxxxxx>
Subject: Re: Linux Driver Project
To: Rabee Al-Maqabi <rabee.almaqabi@xxxxxxxxx>
Cc: Javier Martinez Canillas <martinez.javier@xxxxxxxxx>,
kernelnewbies@xxxxxxxxxxxxxxxxx
Message-ID: <87fwbqeipg.fsf@xxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Rabee Al-Maqabi <rabee.almaqabi@xxxxxxxxx> 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@xxxxxxxxx>
Subject: Re: Profiling my Modules
To: Daniel Baluta <daniel.baluta@xxxxxxxxx>
Cc: kernelnewbies@xxxxxxxxxxxxxxxxx
Message-ID:
<CADDndfPtRis6CuXJN7D0v=snCJ8b_hS0eW2cQoBekXE3UtyXSw@xxxxxxxxxxxxxx>
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@xxxxxxxxx>wrote:
> On Thu, Apr 26, 2012 at 10:33 AM, Rishi Agrawal
> <rishi.b.agrawal@xxxxxxxxx> 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
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------------------------------
Message: 4
Date: Thu, 26 Apr 2012 15:51:10 +0200
From: Bj?rn Mork <bjorn@xxxxxxx>
Subject: Re: Linux Driver Project
To: Rabee Al-Maqabi <rabee.almaqabi@xxxxxxxxx>
Cc: Javier Martinez Canillas <martinez.javier@xxxxxxxxx>,
kernelnewbies@xxxxxxxxxxxxxxxxx
Message-ID: <877gx2eh4h.fsf@xxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8
Bj?rn Mork <bjorn@xxxxxxx> 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@xxxxxxxxxxxxxxxx>
Subject: freelance kernel work
To: <kernelnewbies@xxxxxxxxxxxxxxxxx>
Message-ID: <8acfa9e97f0b3bca53f505c1aca01aed@xxxxxxxxxxxxxxxx>
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.
------------------------------
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*********************************************
--
Regards
Jeshwanth Kumar N K
+91-7411483498
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