Re: Fwd: Re: kstat - an API for gathering kernel stats
Is it possible to make nodes dynamically that are immutable from userland (even by root), but modifyable from the kernel? On Mon, 29 Nov 1999, Andrzej Bialecki wrote: Yes. See for example linux emulator or my SPY module: http://www.freebsd.org/~abial/spy You can also create whole new branches, as the second example shows. Andrzej Bialecki // [EMAIL PROTECTED] WebGiro AB, Sweden (http://www.webgiro.com) // --- // -- FreeBSD: The Power to Serve. http://www.freebsd.org // --- Small Embedded FreeBSD: http://www.freebsd.org/~picobsd/ Dan Seguin Texar Software, Corporation. Visit us at the RSA Conference 2000, January 16-20, San Jose, Booth # 1241 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: Fwd: Re: kstat - an API for gathering kernel stats
On Wed, 8 Dec 1999, Dan Seguin wrote: Is it possible to make nodes dynamically that are immutable from userland (even by root), but modifyable from the kernel? Yes, of course. Just mark them as read-only (CTLFLAG_RD). You are free to assign any value to them within the kernel. If it's more complex type handled with SYSCTL_PROC (like eg. vm.zone sysctl) you still can decide what value you return from kernel, and you can ignore any requests to assign new values. On Mon, 29 Nov 1999, Andrzej Bialecki wrote: Yes. See for example linux emulator or my SPY module: http://www.freebsd.org/~abial/spy You can also create whole new branches, as the second example shows. Andrzej Bialecki // [EMAIL PROTECTED] WebGiro AB, Sweden (http://www.webgiro.com) // --- // -- FreeBSD: The Power to Serve. http://www.freebsd.org // --- Small Embedded FreeBSD: http://www.freebsd.org/~picobsd/ Dan SeguinTexar Software, Corporation. Visit us at the RSA Conference 2000, January 16-20, San Jose, Booth # 1241 Andrzej Bialecki // [EMAIL PROTECTED] WebGiro AB, Sweden (http://www.webgiro.com) // --- // -- FreeBSD: The Power to Serve. http://www.freebsd.org // --- Small Embedded FreeBSD: http://www.freebsd.org/~picobsd/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: Fwd: Re: kstat - an API for gathering kernel stats
On Mon, Nov 29, 1999 at 10:09:35AM +0100, Andrzej Bialecki wrote:
I was thinking about implementing SMP cpu stats using sysctl today and
I have a question - can I create sysctl nodes dynamically ?
i.e.
for (cpu = 0; cpu get_num_cpus(); cpu++) {
/* create sysctl node here ? */
}
Yes. See for example linux emulator or my SPY module:
http://www.freebsd.org/~abial/spy
You can also create whole new branches, as the second example shows.
Thanks - that was useful. However, I noticed that only the leaves
(SYSCTL_INT/LONG/STRING) etc can be dynamically created. But nodes
can't be dynamically created. Am I correct ?
I'm interested in doing something like:
kern.stats.cpu0.idle
kern.stats.cpu0.nice
...
kern.stats.cpu1.idle
kern.stats.cpu1.nice
...
and I want the nodes cpu0, cpu1 etc dynamically created.
But that's no big deal. I'll define 4 cpus for now and zero the values for
non-existent cpus.
-Arun
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Re: Fwd: Re: kstat - an API for gathering kernel stats
On Wed, 8 Dec 1999, Arun Sharma wrote:
On Mon, Nov 29, 1999 at 10:09:35AM +0100, Andrzej Bialecki wrote:
I was thinking about implementing SMP cpu stats using sysctl today and
I have a question - can I create sysctl nodes dynamically ?
i.e.
for (cpu = 0; cpu get_num_cpus(); cpu++) {
/* create sysctl node here ? */
}
Yes. See for example linux emulator or my SPY module:
http://www.freebsd.org/~abial/spy
You can also create whole new branches, as the second example shows.
Thanks - that was useful. However, I noticed that only the leaves
(SYSCTL_INT/LONG/STRING) etc can be dynamically created. But nodes
can't be dynamically created. Am I correct ?
Erhm.. No.
Look closer at the SPY module. I create the whole branch from the root
level. In the standard system there is no such thing as "kld" node,
neither there is a "spy" node. I created both of them. Only then I created
a bunch of leaves (of course, nothing stops you from creating some more
leaves on each intermediate level, if you need them).
The same is with linux emulator. It creates "compat" node, then
"linux" node, and then a couple of sysctls.
Andrzej Bialecki
// [EMAIL PROTECTED] WebGiro AB, Sweden (http://www.webgiro.com)
// ---
// -- FreeBSD: The Power to Serve. http://www.freebsd.org
// --- Small Embedded FreeBSD: http://www.freebsd.org/~picobsd/
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Re: Fwd: Re: kstat - an API for gathering kernel stats
On Wed, Dec 08, 1999 at 05:44:31PM +0100, Andrzej Bialecki wrote: On Wed, 8 Dec 1999, Arun Sharma wrote: Erhm.. No. Look closer at the SPY module. I create the whole branch from the root level. In the standard system there is no such thing as "kld" node, neither there is a "spy" node. I created both of them. Only then I created a bunch of leaves (of course, nothing stops you from creating some more leaves on each intermediate level, if you need them). Given a number N, whose value is determined at run time, could you have created N kld nodes ? -Arun To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: Fwd: Re: kstat - an API for gathering kernel stats
On Wed, 8 Dec 1999, Arun Sharma wrote: I'm interested in doing something like: kern.stats.cpu0.idle kern.stats.cpu0.nice ... kern.stats.cpu1.idle kern.stats.cpu1.nice ... and I want the nodes cpu0, cpu1 etc dynamically created. It would be better to have kern.stats.nice.cpu0 kern.stats.nice.cpu1 or simply kern.stats.nice.0 -- | Matthew N. Dodd | '78 Datsun 280Z | '75 Volvo 164E | FreeBSD/NetBSD | | [EMAIL PROTECTED] | 2 x '84 Volvo 245DL| ix86,sparc,pmax | | http://www.jurai.net/~winter | This Space For Rent | ISO8802.5 4ever | To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: Fwd: Re: kstat - an API for gathering kernel stats
On Wed, 8 Dec 1999, Arun Sharma wrote: I'm interested in doing something like: kern.stats.cpu0.idle kern.stats.cpu0.nice ... kern.stats.cpu1.idle kern.stats.cpu1.nice ... and I want the nodes cpu0, cpu1 etc dynamically created. It would be better to have kern.stats.nice.cpu0 kern.stats.nice.cpu1 or simply kern.stats.nice.0 Yes, please! It would be helpful if the kernel's MIB used instances (and there was easy support for creating them) like the MIBs many of us use SNMP to access in network elements. louie To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: Fwd: Re: kstat - an API for gathering kernel stats
On Sun, 28 Nov 1999, Arun Sharma wrote:
[ For some reason, this post through muc.lists.freebsd.hackers gateway didn't
show up on the mailing list. Forwarding it to the mailing list.. ]
On Thu, 04 Nov 1999 20:38:50 -0800, Mike Smith [EMAIL PROTECTED] wrote:
I don't see any examples in sys/modules. The SYSCTL_INT macros eventually
expands to DATA_SET which puts certain data in a different ELF section.
You don't do anything magic at all; it's handled invisibly by the
kernel linker.
I was thinking about implementing SMP cpu stats using sysctl today and
I have a question - can I create sysctl nodes dynamically ?
i.e.
for (cpu = 0; cpu get_num_cpus(); cpu++) {
/* create sysctl node here ? */
}
Yes. See for example linux emulator or my SPY module:
http://www.freebsd.org/~abial/spy
You can also create whole new branches, as the second example shows.
Andrzej Bialecki
// [EMAIL PROTECTED] WebGiro AB, Sweden (http://www.webgiro.com)
// ---
// -- FreeBSD: The Power to Serve. http://www.freebsd.org
// --- Small Embedded FreeBSD: http://www.freebsd.org/~picobsd/
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