Hi List,
I need to do lot of small allocations (around 70-80 bytes) from a critical
region
while holding a spinlock. Total number of such allocation could go upto tens
of
thousands in few hours. So all these allocations use GFP_ATOMIC flag instead
of
GFP_KERNEL. As per my understanding,
I need to do lot of small allocations (around 70-80 bytes) from a
critical region
while holding a spinlock. Total number of such allocation could go
upto tens of
thousands in few hours. So all these allocations use GFP_ATOMIC flag
instead of
GFP_KERNEL. As per my understanding, GFP_ATOMIC
i'm still looking for how to keep the initrd mounted after booting
on my x86_64 system. can't you do that anymore? it's been a while
since i tried that, and i thought the kernel parm retain_initrd
would do it, and leave it mounted at /initrd. apparently not. am i
misremembering? is there a
i have 2 completely different processes A and B (they do not have any
relationship)
suppose A opens a file with file descriptor 4 and
B opens another file with file descriptor 5
can process A use the fd 5 (i.e using the file object of processs B) by any
means..
if suppose i let the fd 4 of
On Tue, Sep 29, 2009 at 11:50 AM, krushnaal pai krisonea...@gmail.com wrote:
i have 2 completely different processes A and B (they do not have any
relationship)
suppose A opens a file with file descriptor 4 and
B opens another file with file descriptor 5
can process A use the fd 5 (i.e
On Tue, Sep 29, 2009 at 1:06 PM, askb ask...@gmail.com wrote:
I need to do lot of small allocations (around 70-80 bytes) from a
critical region
while holding a spinlock. Total number of such allocation could go
upto tens of
thousands in few hours. So all these allocations use GFP_ATOMIC
On Mon, Sep 28, 2009 at 10:58 PM, Shameem Ahamed
shameem.aha...@yahoo.com wrote:
Thanks for the clarification.
If the buffer and page cache are unified, what is lru ?. Is it part of the
cpu cache, or part of the buffer ?.
Shameem
Please don't do top posting...
AFAIK, LRU is a separate
On Tue, Sep 29, 2009 at 04:39:48AM -0400, Robert P. J. Day wrote:
i'm still looking for how to keep the initrd mounted after booting
on my x86_64 system. can't you do that anymore? it's been a while
since i tried that, and i thought the kernel parm retain_initrd
would do it, and leave it
On Tue, Sep 29, 2009 at 02:20:00PM +0530, krushnaal pai wrote:
i have 2 completely different processes A and B (they do not have any
relationship)
suppose A opens a file with file descriptor 4 and
B opens another file with file descriptor 5
can process A use the fd 5 (i.e using the file
If you take /proc filesystem for example, you can write something to it and
can read something from it depending on what you last wrote.
-nagp
On Fri, Sep 18, 2009 at 9:46 PM, Peter Teoh htmldevelo...@gmail.com wrote:
On Fri, Sep 18, 2009 at 9:07 PM, Leonidas . leonidas...@gmail.com wrote:
On Tue, Sep 29, 2009 at 3:31 PM, Nagaprabhanjan Bellari
nagp@gmail.comwrote:
If you take /proc filesystem for example, you can write something to it and
can read something from it depending on what you last wrote.
-nagp
On Fri, Sep 18, 2009 at 9:46 PM, Peter Teoh
On Tue, Sep 29, 2009 at 05:34:58AM -0400, Robert P. J. Day wrote:
On Tue, 29 Sep 2009, Luciano Rocha wrote:
On Tue, Sep 29, 2009 at 04:39:48AM -0400, Robert P. J. Day wrote:
i'm still looking for how to keep the initrd mounted after
booting on my x86_64 system. can't you do that
On Tue, Sep 29, 2009 at 2:51 AM, Venkatesh Srinivas m...@acm.jhu.edu wrote:
Hi,
Thanks for the reply!
I was looking for more information on data=journal, not data=ordered
or data=writeback; I didn't see comments on it on the ext wiki page,
or two of the three links. Do you know anyplace I
even if process A does recv the file descriptions thru sockets how will it
use the file object of process B?
On Tue, Sep 29, 2009 at 2:58 PM, Luciano Rocha luci...@eurotux.com wrote:
On Tue, Sep 29, 2009 at 02:20:00PM +0530, krushnaal pai wrote:
i have 2 completely different processes A and B
On Tue, 29 Sep 2009, Luciano Rocha wrote:
The initrd option in grub, and the similar one in other boot
loaders, passes a binary image to the kernel.
Then the kernel identifies it as an initramfs or as an initrd. When
the kernel boots, you can see this message:
Trying to unpack rootfs
On Tue, Sep 29, 2009 at 3:34 PM, Leonidas . leonidas...@gmail.com wrote:
On Tue, Sep 29, 2009 at 3:31 PM, Nagaprabhanjan Bellari
nagp@gmail.com wrote:
If you take /proc filesystem for example, you can write something to it
and can read something from it depending on what you last
On Tue, Sep 29, 2009 at 6:17 AM, Peter Teoh htmldevelo...@gmail.com wrote:
On Tue, Sep 29, 2009 at 2:51 AM, Venkatesh Srinivas m...@acm.jhu.edu wrote:
Hi,
Thanks for the reply!
I was looking for more information on data=journal, not data=ordered
or data=writeback; I didn't see comments on
On Tue, Sep 29, 2009 at 06:23:39AM -0400, Robert P. J. Day wrote:
i only have a few minutes to reply to this, but i think you're
oversimplifying. there are two possible early root filesystems:
1) the *internal* initramfs
2) the *external* initrd image
if you check the source in the
On Tue, Sep 29, 2009 at 03:48:48PM +0530, krushnaal pai wrote:
even if process A does recv the file descriptions thru sockets how will it
use the file object of process B?
What do you mean? A file descriptor is a pointer to the kernel's file
object. If you send a file descriptor from process A
there are 2 completely different processes A and B
process A opens a file with fd 4
then i change the 'fs' and 'files' fields of the process descriptor of proc
B to point to the respective fields of proc A
( i.e i let proc B share the 2 tables from proc A)
then proc B opens a file with fd 5
then
On Tue, Sep 29, 2009 at 04:45:28PM +0530, krushnaal pai wrote:
each process has its own 'fd' array isnt it?
What fd array?...
so a fd coming from another process doesnt make sense to the running process
Why not? The file descriptor is just an integer. What the kernel does
with it is its
Krushnaal Pai informed me that he's trying to do this inside the kernel.
That's beyond my expertise...
--
Luciano Rocha luci...@eurotux.com
Eurotux Informática, S.A. http://www.eurotux.com/
pgpiIvahzYsWP.pgp
Description: PGP signature
Hi all.
On the powerpc arch, there is no ioremap_cache() version.
Could someone to explain why?
Thanks
-Original Message-
From: kernelnewbies-bou...@nl.linux.org
[mailto:kernelnewbies-bou...@nl.linux.org] On Behalf Of Jason Nymble
Sent: Friday, September 25, 2009 6:24 PM
To:
Hi All,
I am a new to linux programming. I am currently working PCI based target,
which consists of a CPU soft-core with kernel version 2.6, DDR2 memory and
DMA controller. I need to write an application on target to transfer data
from target DDR2 to host system memory, using target's DMA. How
On Tue, 29 Sep 2009, Luciano Rocha wrote:
On Tue, Sep 29, 2009 at 06:23:39AM -0400, Robert P. J. Day wrote:
the kernel clearly defines the retain_initrd kernel parameter,
so i'm just curious as to its purpose.
To preserve initrds. That is, filesystem images passed as an initrd
that the
Hi all,
I've got a digital IO card hanging off an ISA bus in PC/104 system. I'm
pushing data packets to it, usually 16-32 bytes per transfer, 100x per
second.
Apparently ISA bus clock is supposed to run at 8MHz and I expected to
achieve somewhat close-to-that performance with my driver. To test
hi all,
i just started learning about linux kernel hacking. pardon me if this
question was already asked. if yes, please point me to the archived mail on
this subject.
question: as of now, i have only one pc (dell dimension 3000). i've dual
booted it with windows. in the kernelnewbies faqs i
Hi all,
In linux kernel, all the places i found ,for ex 32KHz clock is
represented as 32768 Hz, not as 32 x 1000 Hz . Could you please help to
understand why 2 ^ x is used instead of 10 ^ y ?
Regards,
Shankar
Anand Arumugam wrote:
what is the
normal environment that is used by most of the kernel hackers and
developers? do they have a dedicated pc for this work and have a
separate pc for other uses? or just create a partition in the hard drive
and use this partition for kernel related development?
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