Hello, all,
I add some codes in various places relating to file operations inside the
kernel, e.g., fdalloc(), fdused(), fdunused(), fdfree() etc.
I am trying to measure the overhead added by these instrumentation code.
my plan is:
in my user space program, i have something like the following:
Hello, all,
I have a Q on filedesc.h:
i am wondering whether the order of the field in struct
_filedesc_ (in sys/filedesc.h) matters?
I added a field to _filedesc_ struct in filedesc.h. It is a dynamically
allocated list, just as fd_ofiles, or fd_ofilefalgs.
I put my new added list right
Hi, I have a Q on generating kernel core dump when the system boots up..
my kernel crashes when it tries to mount the root device, /, i.e.,
before it adding the swap device to the system (so there is no swap
device when the system tries to generate core dump).. I am wondering is
there a way to
Hello, there,
I am looking for the function that handle send/recv file descriptors
through sendmsg/recvmsg?
by looking through source files,
unp_internalize/unp_externalize in kern/uipc-usrreq.c seems relevant..
but i am not sure since i could not guess the meaning of the function
name.. (btw,
Hello, all,
I have a user program as below:
FILE *fd;
while (1)
{
fd= fopen( tmp, r );
if ( fd == NULL )
break;
}
from my understanding, since i open the same file to read, my process
should create a new file descriptor each time when fopen is called.
Therefore,
On Sat, 26 Feb 2005, Yan Yu wrote:
Hello, all,
I have a user program as below:
FILE *fd;
while (1)
{
fd= fopen( tmp, r );
if ( fd == NULL )
break;
}
from my understanding, since i open the same file to read, my process
should create a new file descriptor each
HI, all,
I have a Q on the input parameter of fdrop() and fdrop_locked() in
kern/kern_descrip.c.
i am curious about the design choice of their input parameter.
currently, it is defined as
A) fdrop( struct file *, struct thread *)
hi, THANKS FOR the pointer!
falloc() isn't considered a pluggable kernel API,
that is to say, we've
not engineered FreeBSD with the intent that it be
replaced at run-time.
If you don't mind my asking, what motivates you to
replace falloc()?
i would like to add more checks (e.g.,
Hi, all,
I am wondering if there is a way to use kernel loadable module to
replace the original falloc() (kern/kern_descrip.c) in the system.
I know how to do this if the funciton to be replaced is some system call
function or ufs* operatio ( i could just change the symbol table which
holds
-24 at 14:27 -0800, Yan Yu wrote:
Hi, all, I have a newbie Q:
I am trying to use creating large number of threads and allocting
memory to stress the system.
My user program causes SEG fault in the kernel code, kse_release () in
kern_kse.c.
(it SEG fault before the system can
HI, Thanks for all the info!
kse_release() in this context isn't kernel code, its from libpthread.
The kernel equivalent of a segfault would generate a panic.
Just in case: you're attempting to allocate more than 5000 threads:
Each one from main tries to recursively create 5000 more, and so
an error in this line:
printf(\n%d: Hello World!\n, threadid);
Since threadid is not an int, its a pointer
On Tue, 2005-01-25 at 10:31 -0800, Yan Yu wrote:
Hi, thanks a LOT for looking into this.
yes, that is exactly my output before the SEG fault happens (btw, i add
if (p) before
p[id
stress.txt
On Mon, 2005-01-24 at 14:27 -0800, Yan Yu wrote:
Hi, all, I have a newbie Q:
I am trying to use creating large number of threads and allocting
memory to stress the system.
My user program causes SEG fault in the kernel code, kse_release () in
kern_kse.c.
(it SEG fault
Hi, all, I have a newbie Q:
I am trying to use creating large number of threads and allocting
memory to stress the system.
My user program causes SEG fault in the kernel code, kse_release () in
kern_kse.c.
(it SEG fault before the system can be stressed;(
the stack when the SEG fault happens
Cool, Thanks A LOT for looking into this! I appreciate it!
after I reduce the BSIZE to 50k, it can create more than 10k threads
before calloc error.. so i am going to drop this thread:)
(just fyi, i use your prog on our machine w/ BSIZE =500k
(~512M Ram), again i got SEG fault before the calloc
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