Sure, I forgot what you said; precisely the mechanism allows to use
lots of linear space without necessarily allocating physical memory
(demand paging and the like).
What about the rest of what I said? Is it correct or is there
something wrong about it?
Thanks.
On 5/13/13, valdis.kletni...@vt.edu
On Mon, 13 May 2013 14:11:22 -0500, Sergio Andr said:
> 2. When user applications allocates memory, the kernel must allocate
> virtual memory and physical memory, right?
Wrong. If userspace allocates (say) 15M of memory, the kernel has every right
to overcommit and not actually allocate either ph
Hi there,
I learned, e.g. from here that user space device drivers are indeed possible:
http://www.makelinux.net/ldd3/chp-2-sect-9
Are there serious user space drivers in Linux? Could you name a few?
Or, is this just for hacking a driver for your home-made hardware?
- Gergely
I've got some questions regarding this linear to physical address
mapping on x86 architecture; I'm not sure I've grassped the whole
thing.
Before asking, I'd like to be sure I understand some basic things about this:
1. Addresses within the kernel are linked to start at 0xC000 so,
that the ker
El 13/05/2013 10:07, "shampavman" va escriure:
>
> Hi all,
>
> Supposing i create a file of size 10K, it will occupy 2 blocks (4K each).
> Now if i want to read only 1 block from it how can i do it?
>
> read(fd, buf, 4096) ;
> would this mean i would read the first block and all its contents?
You
Hi,
I was under the impression that when the bio comes to a block device
driver its size is variable. But, after writing a block device driver i
realized that such is not the case and it always is 4096.
Does this mean that by default if i don't use any merge function the bio
will always have siz
On Mon, 13 May 2013 13:35:54 +0530, shampavman said:
> Hi all,
>
> Supposing i create a file of size 10K, it will occupy 2 blocks (4K each).
> Now if i want to read only 1 block from it how can i do it?
>
> read(fd, buf, 4096) ;
> would this mean i would read the first block and all its contents?
Is this is a question that popped up to your mind arbitrarily or do you
have a specific system at hand which triggered you to ponder over the
design of the kernel ? I felt the answer to this question is not straight
forward but is multi faceted and to be discussed in a specific context.
On Sat, M
Hi Kevin,
El Mon, May 13, 2013 at 10:51:33AM +0300 Kevin Wilson ha dit:
> I have a question about git patches.
> When I run
> git log include/linux/skbuff.h
> and page down till the end, I reach
> 1da177e Linux-2.6.12-rc2
>
> (I do it on the net-next tree.)
>
> git show 1da177e gives:
> Author:
On 13 May 2013 10:51, Kevin Wilson wrote:
> Hello,
> I have a question about git patches.
> When I run
> git log include/linux/skbuff.h
> and page down till the end, I reach
> 1da177e Linux-2.6.12-rc2
>
> (I do it on the net-next tree.)
>
> git show 1da177e gives:
> Author: Linus Torvalds
> Date:
Hi all,
Supposing i create a file of size 10K, it will occupy 2 blocks (4K each).
Now if i want to read only 1 block from it how can i do it?
read(fd, buf, 4096) ;
would this mean i would read the first block and all its contents?
Thanks
___
Kernelne
On Mon, May 13, 2013 at 10:51 AM, Kevin Wilson wrote:
> Hello,
> I have a question about git patches.
> When I run
> git log include/linux/skbuff.h
> and page down till the end, I reach
> 1da177e Linux-2.6.12-rc2
>
> (I do it on the net-next tree.)
>
> git show 1da177e gives:
> Author: Linus Torva
Hello,
I have a question about git patches.
When I run
git log include/linux/skbuff.h
and page down till the end, I reach
1da177e Linux-2.6.12-rc2
(I do it on the net-next tree.)
git show 1da177e gives:
Author: Linus Torvalds
Date: Sat Apr 16 15:20:36 2005 -0700
Linux-2.6.12-rc2
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