2012/6/22 <kernelnewbies-requ...@kernelnewbies.org> > Send Kernelnewbies mailing list submissions to > kernelnewbies@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-requ...@kernelnewbies.org > > You can reach the person managing the list at > kernelnewbies-ow...@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: download the source code of some commands (Greg Freemyer) > 2. could some current.h files be simplified? (Robert P. J. Day) > 3. Re: download the source code of some commands (Wang Lei) > 4. Re: download the source code of some commands (??) > 5. Re: Kernel Memory (mic...@michaelblizek.twilightparadox.com) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 21 Jun 2012 10:42:12 -0400 > From: Greg Freemyer <greg.freem...@gmail.com> > Subject: Re: download the source code of some commands > To: ?? <wangzhe5...@gmail.com> > Cc: kernelnewbies <kernelnewbies@kernelnewbies.org> > Message-ID: > <CAGpXXZLM7s_=2xwcedftsrj_0-ejgp7ap7xnu1xemzmehxt...@mail.gmail.com > > > Content-Type: text/plain; charset=UTF-8 > > On Thu, Jun 21, 2012 at 8:48 AM, ?? <wangzhe5...@gmail.com> wrote: > > ? Hi all: > > ? ? ?? I want to see some source code of some commands,for > > example,halt,reboot,uptime,and so on. > > > > but i don't kown where to download??? can you give me some advice? > > > > Thanks in advance! > > You need to figure out how your distro of choice lets you query the > filelist for packages. > > I use openSUSE primarily and it has the Yast tool that lets you do > that in the software management section. > > uptime => coreutils > reboot => aaa_base > halt => aaa_base > > Once you know the package your distro uses you can download the > corresponding source package for it. > > You will have better luck learning the process you need to know by > asking on a distro specific mailing list. > > Greg > > hi, you can use the download tool to get the sources code. eg: apt-get source ssh (ubuntu) you can get ssh source code. but, not all !
> > > ------------------------------ > > Message: 2 > Date: Thu, 21 Jun 2012 10:54:59 -0400 (EDT) > From: "Robert P. J. Day" <rpj...@crashcourse.ca> > Subject: could some current.h files be simplified? > To: Kernel Newbies <kernelnewbies@kernelnewbies.org> > Message-ID: <alpine.DEB.2.02.1206211048240.22454@oneiric> > Content-Type: TEXT/PLAIN; charset=US-ASCII > > > it *seems* as if a number of current.h files from various > architectures could be simplified. here's <asm-generic/current.h>, > which gives any architecture a generic starting point in defining both > get_current() and current: > > #ifndef __ASM_GENERIC_CURRENT_H > #define __ASM_GENERIC_CURRENT_H > > #include <linux/thread_info.h> > > #define get_current() (current_thread_info()->task) > #define current get_current() > > #endif /* __ASM_GENERIC_CURRENT_H */ > > and if that's acceptable, any architecture is welcome to simply > include it as, for instance, mips does in <asm/current.h>: > > #include <asm-generic/current.h> > > but here's the current.h file for parisc: > > #ifndef _PARISC_CURRENT_H > #define _PARISC_CURRENT_H > > #include <linux/thread_info.h> > > struct task_struct; > > static inline struct task_struct * get_current(void) > { > return current_thread_info()->task; > } > > #define current get_current() > > #endif /* !(_PARISC_CURRENT_H) */ > > i'm not sure i see why the generic version wasn't adequate for > parisc (apart from the explicit pointer casting). same thing with the > cris architecture and, i'm sure, others. > > is there any reason why some of those current.h files can't just > include the generic one? > > rday > > -- > > ======================================================================== > Robert P. J. Day Ottawa, Ontario, CANADA > http://crashcourse.ca > > Twitter: http://twitter.com/rpjday > LinkedIn: http://ca.linkedin.com/in/rpjday > ======================================================================== > > > > ------------------------------ > > Message: 3 > Date: Thu, 21 Jun 2012 23:22:49 +0800 > From: Wang Lei <f3d...@gmail.com> > Subject: Re: download the source code of some commands > To: ?? <wangzhe5...@gmail.com> > Cc: kernelnewbies <kernelnewbies@kernelnewbies.org> > Message-ID: <4fe33c55.83da440a.4026.ffffc...@mx.google.com> > Content-Type: text/plain; charset=utf-8 > > If you use Debian or other distribution with apt package system. > > You can use whereis to locate this command. > [~]$ whereis halt > halt: /sbin/halt /usr/share/man/man5/halt.5.gz > /usr/share/man/man8/halt.8.gz > > Then, use dpkg -S to show which package it's included. This one is: > sysvinit. > [~]$ dpkg -S /sbin/halt > sysvinit: /sbin/halt > > Now, you can download the source from Debian source, use: > [~]$ apt-get source sysvinit > > Or if you want the original source, use aptitude (or apt-cache) find > it's homepage. > [~]$ aptitude show sysvinit > Package: sysvinit > ...... > Homepage: http://savannah.nongnu.org/projects/sysvinit > > At last, get it from there. As for other package systems, I think there > should be a way too. Or you can google. > > On 2012-06-21 20:48:48 +0800, ?? wrote: > > Hi all: > > I want to see some source code of some commands,for > > example,halt,reboot,uptime,and so on. > > > > but i don't kown where to download? can you give me some advice? > > > > Thanks in advance! > > _______________________________________________ > > Kernelnewbies mailing list > > Kernelnewbies@kernelnewbies.org > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > -- > Regards, > Lei > > > > ------------------------------ > > Message: 4 > Date: Thu, 21 Jun 2012 23:46:21 +0800 > From: ?? <wangzhe5...@gmail.com> > Subject: Re: download the source code of some commands > To: Wang Lei <f3d...@gmail.com> > Cc: kernelnewbies <kernelnewbies@kernelnewbies.org> > Message-ID: > <cajrru3xdps620joe+q8w+siugvr3czzjohzg3e+pwssu5t0...@mail.gmail.com > > > Content-Type: text/plain; charset="gb2312" > > 2012/6/21 Wang Lei <f3d...@gmail.com> > > > If you use Debian or other distribution with apt package system. > > > > You can use whereis to locate this command. > > [~]$ whereis halt > > halt: /sbin/halt /usr/share/man/man5/halt.5.gz > > /usr/share/man/man8/halt.8.gz > > > > Then, use dpkg -S to show which package it's included. This one is: > > sysvinit. > > [~]$ dpkg -S /sbin/halt > > sysvinit: /sbin/halt > > > > Now, you can download the source from Debian source, use: > > [~]$ apt-get source sysvinit > > > > Or if you want the original source, use aptitude (or apt-cache) find > > it's homepage. > > [~]$ aptitude show sysvinit > > Package: sysvinit > > ...... > > Homepage: http://savannah.nongnu.org/projects/sysvinit > > > > At last, get it from there. As for other package systems, I think there > > should be a way too. Or you can google. > > > > Thank you very much ! i follow your steps, and download the source code > successfully. > > On 2012-06-21 20:48:48 +0800, ?? wrote: > > Hi all: > > I want to see some source code of some commands,for > > example,halt,reboot,uptime,and so on. > > > > but i don't kown where to download? can you give me some advice? > > > > Thanks in advance! > > > > _______________________________________________ > > > Kernelnewbies mailing list > > > Kernelnewbies@kernelnewbies.org > > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > -- > > Regards, > > Lei > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20120621/6e586022/attachment-0001.html > > ------------------------------ > > Message: 5 > Date: Thu, 21 Jun 2012 17:48:25 +0200 > From: mic...@michaelblizek.twilightparadox.com > Subject: Re: Kernel Memory > To: Vijay Chauhan <kernel.vi...@gmail.com> > Cc: kernelnewbies@kernelnewbies.org > Message-ID: <20120621154824.GA2280@grml> > Content-Type: text/plain; charset=us-ascii > > Hi! > > On 17:57 Thu 21 Jun , Vijay Chauhan wrote: > > Hello, > > > > I am newbie. > > It has been said "kernel memory is not pageable" > > What does it mean? There is no concept of kernel virtual address? > > > > Any simple explanation will help me to udnerstand. > > The right term is actually "kernel memory is not swappable". Swapping means > writing inactive memory to disk and then using it for something else. > Kernel > memory not being swappable is a design decicion made in the early linux > days. > Operating systems which swap kernel memory need to isolate everything which > should not be swappd out (e.g. things needed for swap-in, realtime stuff, > security sensitive data, ...). This is quite a bit of work. I also guess > it is > pretty pointless nowadays. Installed memory and is getting so huge that > virtual > memory developers have a hard time trying to keep cpu-usage overhead for > swapping user space memory low. > > > There is no concept of kernel virtual address? > > Kernel memory uses virtual addresses as well. However, these the entire > system > memory is continuously mapped somewhere in the virtual address space. The > drawback is that fragmentation turns allocation of large continuous memory > regions into a game of luck. > > There is also an virtual address area (vmalloc) which is used to > dynamically > map multiple scattered pages to a continuous region. But this is rather > slow > and rarely used. > > You might want to take a look at: http://lwn.net/Kernel/LDD3/ > > -Michi > -- > programing a layer 3+4 network protocol for mesh networks > see http://michaelblizek.twilightparadox.com > > > > ------------------------------ > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > End of Kernelnewbies Digest, Vol 19, Issue 43 > ********************************************* >
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