Hello,
I was looking at how a syscall read/write was done, and i found this :
loff_t pos = file_pos_read(f.file);
ret = vfs_read(f.file, buf, count, &pos);
file_pos_write(f.file, pos);
fdput(f);
...
My questions are :
Where did the locking go? I would have imaginated some
2013/1/29 Tobias Boege
> On Tue, 29 Jan 2013, Karaoui mohamed lamine wrote:
> > Hello,
> >
> > I was looking at how a syscall read/write was done, and i found this :
> >
> >
> >loff_t pos = file_pos_read(f.file);
> >ret = vfs_read(f.f
While on subject i would to ask a question :
> Usually, I invoke it this way:
> > qemu -kernel /tmp/kernel-image -initrd /tmp/initrd -hda /tmp/guest.img
>
>
Where can we found the "guest.img", or more exactly what to put in it ? I
suppose a distrubition ?
Is there any small distribution, maybe
Tahnks guys!
2013/1/30 Karaoui mohamed lamine
> thanks, i think i get it.
>
> 2013/1/30
>
> On Tue, 29 Jan 2013 20:16:26 +0100, you said:
>>
>> > Actually my question is :
>> > Does POSIX specifies the fact that we need to use "lockf" to be abl
;f_u.fu_list);
> atomic_long_set(&f->f_count, 1);
> rwlock_init(&f->f_owner.lock);
> spin_lock_init(&f->f_lock);
> eventpoll_init_file(f);
> /* f->f_version: 0 */
>
>
> On Thu, Feb 7, 2013 at 4:44 PM, Karaoui mo
2013/2/27 sandeep kumar
> >>I am not sure but what if you make the variable as a volatile?
> Hey i tried. But still is showing the same time for int & volatile int.
>
>
"volatile" only say to the compiler to not put the variable in a register.
Could i ask why does you want to mesure the speed of
ope i helped.
regards.
>
> On Wed, Feb 27, 2013 at 2:30 PM, Karaoui mohamed lamine <
> mohar...@gmail.com> wrote:
>
>>
>>
>> 2013/2/27 sandeep kumar
>>
>>> >>I am not sure but what if you make the variable as a volatile?
>>> He
mm/page_alloc.c
AFAICC it's memmap_init_zone that initialize all pfns of a zone to
default values (setting the pages as reserved).
Note that for the page structures we don't use the standard memory
allocators (kmalloc, vmalloc, etc), we simply calculate the amount of
memory that all the structure
2015-05-27 3:12 GMT+02:00 Le Tan :
> Hi,
> Is there an explict split between userspace and kernel in physical
> memory on Linux x86-64? That is, given a physical address, can I tell
> whether this address is from userspace or not?
>
No. The same physical address can be used by both the kernel an
Hi list,
Does the "migrate_pages" syscall migrate memory pages in a *lazy* manner?
if not, is there another syscall or patch that does it?
Regards,
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tables at the kernel level...
Regards,
2018-01-19 14:26 GMT-05:00 :
> On Fri, 19 Jan 2018 13:57:18 -0500, Karaoui mohamed lamine said:
> >
> > Does the "migrate_pages" syscall migrate memory pages in a *lazy* manner?
> > if not, is there another syscall o
Hi all,
According to the man page of "ulimit", it is possible to limit the virtual
address space of a user process: https://ss64.com/bash/ulimit.html
To limit the virtual address space to 2 GB:
$ ulimit -SH -v 1048576
However, it seems that "stack" allocation ignores this limit (I tried with
both
Hi list,
I am currently encountering a kernel oops that indicate an "invalid opcode:
[#1] SMP"
I am working on this project https://github.com/GiantVM/Linux-DSM
The full log of the bug can be found here:
https://github.com/GiantVM/Linux-DSM/pull/3 (at the end)
Here is a snippet of the log:
Thank you Valdis for the quick response.
Noted, I will see with the developer if he can still create a branch to
document his modifications...
On Thu, Mar 19, 2020, 10:54 AM Valdis Klētnieks
wrote:
> On Thu, 19 Mar 2020 10:22:25 +0100, Karaoui mohamed lamine said:
>
> > I
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