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* download the source code of some commands
@ 2012-06-21 12:48 王哲
  2012-06-21 12:53 ` Ashish_Bunkar at Dell.com
                   ` (4 more replies)
  0 siblings, 5 replies; 10+ messages in thread
From: 王哲 @ 2012-06-21 12:48 UTC (permalink / raw)
  To: kernelnewbies

  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!
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* RE: download the source code of some commands
@ 2012-06-21 14:29 jeshwanth Kumar N K
  0 siblings, 0 replies; 10+ messages in thread
From: jeshwanth Kumar N K @ 2012-06-21 14:29 UTC (permalink / raw)
  To: kernelnewbies

Hello 

U can download coreutils from gnu.org.

Sent from my HTC

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Message: 1
Date: Thu, 21 Jun 2012 18:17:36 +0800
From: ?? <lovelylich@gmail.com>
Subject: Re: [RFC] tcp: How does SACK or FACK determine the time to
	start	fast retransmition?
To: Vijay Subramanian <subramanian.vijay@gmail.com>
Cc: netdev <netdev@vger.kernel.org>, kernelnewbies at kernelnewbies.org
Message-ID: <4FE2F4C0.4020900@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

? 2012/6/21 16:42, Vijay Subramanian ??:
> With SACK, number of  dupacks does not have much meaning. What matters is
> --how the SACK scoreboard looks like i.e. which packets are tagged
> Lost/Sacked/Retransmitted
> -- Whether FACK is in use (this assumes holes in between sacked
> packets are lost and have left the network and so we can send out more
> packets)
>
> So, stack does not count the number of dupacks that have come in. Only
> SACK blocks matter.
> You can try to track the following path:
> tcp_ack() deals with incoming acks and if it sees a dupack (does not
> matter what number), or incoming packet contains SACK it calls
> tcp_fastretrans_alert() which calls  tcp_xmit_retransmit_queue().
>
> tcp_xmit_retransmit_queue() decides which packets to retransmit. The
> first packet to start retransmitting from is tracked in
> tp->retransmit_skb_hint.
> Note that the dupThresh is actually tracked by tp->reordering which
> measures  the reordering in the network and is not fixed at 3.  So, if
> more than
> tp->reordering packets have been acked above a given packet, this
> packet is a candidate for retransmisson. See tcp_mark_head_lost() to
> see how the
> reordering metric is used to mark packets as lost. This corresponds to
> the check you mentioned in the RFC.
>
> So, window permitting, packets are sent as follows;
> (a)-- Packets marked lost as per description above
> (b)-- new packets (if any)
> (c)-- Holes between sacked packets  which are not reliably lost.
>
> choice between (b) and (c) is made in tcp_can_forward_retransmit().
>
> Hope this helps.
> Vijay
>
It is just I wanted! Thanks for your detailed explaination and kindness.




------------------------------

Message: 2
Date: Thu, 21 Jun 2012 17:57:22 +0530
From: Vijay Chauhan <kernel.vijay@gmail.com>
Subject: Kernel Memory
To: kernelnewbies at kernelnewbies.org
Message-ID:
	<CAJ61zBA++CFmTHSb2cRr=cKJdTkVYsSVs3_igESbbf21gWaqCQ@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

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.

Thanks,
Vijay



------------------------------

Message: 3
Date: Thu, 21 Jun 2012 20:48:48 +0800
From: ?? <wangzhe5004@gmail.com>
Subject: download the source code of some commands
To: kernelnewbies <kernelnewbies@kernelnewbies.org>
Message-ID:
	<CAJrRU3VHh719vZgCCJ3r8K842YemEo9d5_0swgqsGDNXE0vxVQ@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

  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!
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Message: 4
Date: Thu, 21 Jun 2012 05:53:00 -0700
From: <Ashish_Bunkar@Dell.com>
Subject: RE: download the source code of some commands
To: <wangzhe5004@gmail.com>, <kernelnewbies@kernelnewbies.org>
Message-ID:
	<A1A98FD909DC5248811A65C5D18E9C7635DE8BE55B@BLRX7MCDC202.AMER.DELL.COM>
	
Content-Type: text/plain; charset="iso-2022-jp"

All commands are bin files. You should find the scripts for them in /usr/bin only.

Ashish Bunkar
Linux Engineering
Dell | BDC
office +91-80-28078131,  mobile +91-7259183696
Ashish_Bunkar at dell.com<mailto:narayanan_d@dell.com>



From: kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of ??
Sent: Thursday, June 21, 2012 6:19 PM
To: kernelnewbies
Subject: download the source code of some commands

  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!
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Message: 5
Date: Thu, 21 Jun 2012 21:20:02 +0800
From: ?? <wangzhe5004@gmail.com>
Subject: Re: download the source code of some commands
To: Ashish_Bunkar at dell.com
Cc: kernelnewbies at kernelnewbies.org
Message-ID:
	<CAJrRU3VPyFW+ww6GO+HHneMbsQhj676VX1f7g+eHus6_WTZSCw@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

2012/6/21 <Ashish_Bunkar@dell.com>

> All commands are bin files. You should find the scripts for them in
> /usr/bin only.****
>
> **
>
    scripts ?  can you give an example for an command?  Thanks!


> **
>
> *Ashish Bunkar*
>
> Linux Engineering****
>
> *Dell* | BDC**
>
> *office* +91-80-28078131,  *mobile* +91-7259183696****
>
> Ashish_Bunkar at dell.com <narayanan_d@dell.com>****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* kernelnewbies-bounces at kernelnewbies.org [mailto:
> kernelnewbies-bounces at kernelnewbies.org] *On Behalf Of *??
> *Sent:* Thursday, June 21, 2012 6:19 PM
> *To:* kernelnewbies
> *Subject:* download the source code of some commands****
>
> ** **
>
>   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!****
>
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Message: 6
Date: Thu, 21 Jun 2012 17:32:22 +0400
From: Denis Kirjanov <kirjanov@gmail.com>
Subject: Re: download the source code of some commands
To: ?? <wangzhe5004@gmail.com>
Cc: kernelnewbies <kernelnewbies@kernelnewbies.org>
Message-ID:
	<CAHj3AV=8508AG5KF96nSGQOpvi+xrEANQT_qCVeHmcXx7qJYsw@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

How does it related to the kernel?


On 6/21/12, ?? <wangzhe5004@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!
>


-- 
Regards,
Denis



------------------------------

Message: 7
Date: Thu, 21 Jun 2012 09:35:17 -0400
From: HowKernel StuffWorks <howkernelstuffworks@gmail.com>
Subject: Re: Kernel Memory
To: Vijay Chauhan <kernel.vijay@gmail.com>
Cc: kernelnewbies at kernelnewbies.org
Message-ID:
	<CAJ5UobAF6GWUPgN11CNyZMtwBEvfrj1PXqJ5nht6NjbS=qWCyg@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi,
  I am a kernel newbie too, Kernel memory is not pagable, because kernel
itself is responsible for paging. See this discussion,
http://kerneltrap.org/node/6404

  Paging happens for regular processes, i.e each process memory is divided
into a page of certain size(4kb in Linux), so it can swap for another page
that might be needed for that particular moment, it usually replaces an
page that have not been used for long time(see LRU,internal fragmentation).
Kernel is a process too, just like anyother process, but it differs from
others because it directly talks to the hardware and also it is the one
which takes care of paging and LRU algo's. So it does not make much sense,
for a kernel memory to be pageable, because, if it removes the page that
contains that has the paging algorithm, then there is  no way to come back,
you want to retrieve a page from disk_swap_area, but you cannot, because
the page that contains code to retrieve the instructions are paged :)...
This is not just for paging, since kernel controls everything, it is not
advisable to put its own code in swap area(see, virtual memory, virtual
memory = physical memory + swap space).

BTW, i am a kernel newbie too, this is my basic understanding, please feel
free to correct it, if I am wrong....

On Thu, Jun 21, 2012 at 8:27 AM, Vijay Chauhan <kernel.vijay@gmail.com>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.
>
> Thanks,
> Vijay
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-06-21 12:48 download the source code of some commands 王哲
2012-06-21 12:53 ` Ashish_Bunkar at Dell.com
2012-06-21 13:20   ` 王哲
2012-06-21 13:31 ` AFT
2012-06-21 13:32 ` Denis Kirjanov
2012-06-21 14:42 ` Greg Freemyer
2012-06-21 15:22 ` Wang Lei
2012-06-21 15:46   ` 王哲
2012-06-21 17:06     ` Wang Lei
  -- strict thread matches above, loose matches on Subject: below --
2012-06-21 14:29 jeshwanth Kumar N K

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