something a reasonable program can do, and if you try to do
> it, we'll give you random results back - but they will not be _security_
> holes". We don't need to be _nice_ to unreasonable requests. We just must
> never panic, otherwise crash or allow unreasonable requests to mess up
&g
> Please read the FAQ at http://www.tux.org/lkml/
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More maj
o unreasonable requests. We just must
never panic, otherwise crash or allow unreasonable requests to mess up
_other_ people)
Linus
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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.
> > > Where can they be found? What do they imply for the kernel?
> > >
> > > George
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > > More
linux-kernel" in
the body of a message to [EMAIL PROTECTED]
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Please read the FAQ at http://www.tux.org/lkml/
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> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
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o at http://vger.kernel.org/majordomo-info.html
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his
going to work for Linux?
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tch
+ * counters 0 and 2 atomically before and after reprogramming to figure it out.
+ */
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before and after reprogramming to figure it out.
+ */
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?
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P
no to SMP
> support in Linux ;)
And perhaps he was right!
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!
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working code.
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Please read the FAQ at http://www.tux.org/lkml/
ent with a separate, limited set of APIs. You can't run XMMS,
or any other existing Linux audio app in RTLinux. I want a low-latency
Linux, not just another RTOS living parasitically alongside Linux.
Nice marketing line, but it is not working code.
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ecause they were stupid. And when Rob Pike redesigned a new
"unix" Plan9 note there is no-preemptive kernel, and the core Linux
designers have rejected preemptive kernels too. Now it is certainly possible
that things have change and/or all these folks are just plain wrong. But
I wouldn'
ome of those
> parts of the VM and buffercache. I don't think this will
> be too hard, but they have to *want* to change :)
>
> Some of those algorithms are approximately O(N^2), for huge
> values of N.
>
>
> -
> -
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Victor Yodaik
ed preemptive kernels too. Now it is certainly possible
that things have change and/or all these folks are just plain wrong. But
I wouldn't bet too much on it.
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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
ww
_measure();
> + }
> + print_buf("empty smp_call_function()");
> + clean_buf();
> +
> + set_current_state(TASK_UNINTERRUPTIBLE);
> + schedule_timeout(200);
> + for(i=0;i<100;i++) {
> + star
function(just_one_page,NULL,
+ 1, 1);
+ just_one_page(NULL);
+ return_immediately(NULL);
+ return_immediately(NULL);
+ end_measure();
+ }
+ print_buf("fl
eturn -EKNUCKLEHEAD;
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NUCKLEHEAD;
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> Casilla 9G, Vin~a del Mar, Chile +56 32 672616
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do _use_ the operating system
to run important applications and
an "application goes down or screws up" can be quite serious.
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www.fsmlabs.c
the operating system
to run important applications and
an "application goes down or screws up" can be quite serious.
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To u
t; Please read the FAQ at http://www.tux.org/lkml/
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t that. (Self-flagellate). However that is
> architecture specific. If it's not an SMP Vax port, no big deal. If it
The entire concept of an SMP vax port leaves me disoriented.
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Victor Yodaiken
Finite State Machine Labs: The RTLinux
we could have fast computation of cpu-id on smp machines.
>
> -Mitch
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linux-kernel" in
> the body of a message to [EMAIL PROTECTED]
> Please read the FAQ at http://www.tux.org/lkml/
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D]
Please read the FAQ at http://www.tux.org/lkml/
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. If it's not an SMP Vax port, no big deal. If it
The entire concept of an SMP vax port leaves me disoriented.
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management of space. In a truly embedded system, there can easily be a user
level
root process that watches memory usage and prevents DOS attacks -- if the OS provides
settable enforced quotas etc.
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Victor Yodaiken
Finite
e(myprocess)
Then we could have a config-optional per-process pinned page accounting with the
possibility of doing something sensible in a user-space daemon when memory is low.
>
> --Stephen
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ling kernel code
can take the responsible action.
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e
can take the responsible action.
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t
get_per_process_page(myprocess) or even get_per_process_file_use_page(myprocess)
Then we could have a config-optional per-process pinned page accounting with the
possibility of doing something sensible in a user-space daemon when memory is low.
--Stephen
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Vi
that watches memory usage and prevents DOS attacks -- if the OS provides
settable enforced quotas etc.
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son). The
> counting of page table "beans" is critical.
I've seen the assertion before, reasons would be interesting.
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space quotas and mmap should kill
> > the process on low mem for page tables.
>
> Those quotas being exactly what beancounter is
But that is a function specific counter, not a counter in the
alloc code.
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om this list: send the line "unsubscribe linux-kernel" in
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> Please read the FAQ at http://www.tux.org/lkml/
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www
to go looking for another way of
> achieving the same protection?
On general principles, I don't see any substitute for clean code in the kernel and
my prediction is that if you show me an example of
DoS vulnerability, I can show you fix that does not require bean counting.
Am I wrong?
--
)
I like ENOMEM anyways.
>
> The same accounting really needs to be done for page tables, as that
> represents one of the biggest sources of unaccounted, unswappable
> pages which user processes can cause to be created right now.
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---
memory shortage
and that only starts going to the slow case when the system is stalling due to memory
shortages anyways.
>
> -- Jamie
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on failure is simple, fast, and robust.
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tmp->next = NULL;
walk->next = tmp;
walk = tmp;
nfds -=__MAX_POLL_TABLE_ENTRIES;
}
>
> --Stephen
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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lloc_all(alloc_vec) == FAIL) return -ENOMEM;
else alloc_vec[i].ptr is the pointer.
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that if you show me an example of
DoS vulnerability, I can show you fix that does not require bean counting.
Am I wrong?
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To un
accounted, unswappable
pages which user processes can cause to be created right now.
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vec[i].ptr is the pointer.
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.
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following
a safe algorithm that is optimized for the case when there is no memory shortage
and that only starts going to the slow case when the system is stalling due to memory
shortages anyways.
-- Jamie
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Victor Yodaiken
Finite State
hould kill
the process on low mem for page tables.
Those quotas being exactly what beancounter is
But that is a function specific counter, not a counter in the
alloc code.
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Victor Yodaiken
Finite State Machine Labs: The RTLin
would be interesting.
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be linux-kernel" in
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e only thing I ever want a debugger for is a stacktrace back. If
> you give me that, I usually don't need anything else; and in general, you
There are debuggers that do other stuff too? I gotta read the adb
manual some day.
--
-----
ever want a debugger for is a stacktrace back. If
you give me that, I usually don't need anything else; and in general, you
There are debuggers that do other stuff too? I gotta read the adb
manual some day.
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Victor Yodaiken
Finite
;. Of course, we could
actually
use benchmarks instead.
And, to me, if kernel compiles take longer, I don't care how fast it "feels".
>
> -- Jamie
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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs
d, to me, if kernel compiles take longer, I don't care how fast it "feels".
-- Jamie
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On Tue, Sep 12, 2000 at 04:30:32PM +0200, Jamie Lokier wrote:
> Sure the global system is slower. But the "interactive feel" is faster.
Let's pop up little buttons to make it "feel" faster.
--
-----
Victor Yodaike
load, your latency is already screwed anyways because of large
> backlog queue; this is regardless of mitigation.
Or maybe the extra delay in congested circumstances will cause more
timeouts and that's precisely when you need to improve latency?
--
anyways because of large
backlog queue; this is regardless of mitigation.
Or maybe the extra delay in congested circumstances will cause more
timeouts and that's precisely when you need to improve latency?
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Victor Yodaiken
Finite
ods.
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.
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What is the problem with the often proposed CLONE_PARENT solution?
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Victor Yodaiken
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T solution?
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Victor Yodaiken
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Please
ood enough" for security?
On processor A a SIG_STOP is issued to a thread-group while on processor
B a thread element has just entered write. How many bytes written is
"good enough".
I've really exceeded my quota for this news group and will respond
privately if you want to continue.
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