Re: Critical Sections for userland.

2007-10-04 Thread Marcel Moolenaar
On Oct 4, 2007, at 10:43 AM, Daniel Eischen wrote: On Thu, 4 Oct 2007, Alfred Perlstein wrote: * Daniel Eischen <[EMAIL PROTECTED]> [071004 06:05] wrote: His point about telling us what you're really doing, so we might off other ways to do it is valid. We don't know why you are using homeg

Re: Critical Sections for userland.

2007-10-04 Thread Julian Elischer
Attilio Rao wrote: 2007/10/3, Alfred Perlstein <[EMAIL PROTECTED]>: * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: On Tue, 2 Oct 2007, Alfred Perlstein wrote: Hi guys, we need critical sections for userland here. This is basically to avoid a process being switched out while holdi

Re: Critical Sections for userland.

2007-10-04 Thread Attilio Rao
2007/10/3, Alfred Perlstein <[EMAIL PROTECTED]>: > * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > > > >Hi guys, we need critical sections for userland here. > > > > > >This is basically to avoid a process being switched out while holdi

Re: Critical Sections for userland.

2007-10-04 Thread Daniel Eischen
On Thu, 4 Oct 2007, Alfred Perlstein wrote: * Daniel Eischen <[EMAIL PROTECTED]> [071004 06:05] wrote: His point about telling us what you're really doing, so we might off other ways to do it is valid. We don't know why you are using homegrown user-level spinlocks instead of pthread mutexes.

Re: Critical Sections for userland.

2007-10-04 Thread Alfred Perlstein
* Wilko Bulte <[EMAIL PROTECTED]> [071004 04:15] wrote: > Quoting Alfred Perlstein, who wrote on Thu, Oct 04, 2007 at 03:19:02AM -0700 > .. > > * Dag-Erling Sm??rgrav <[EMAIL PROTECTED]> [071004 03:01] wrote: > > > Alfred Perlstein <[EMAIL PROTECTED]> writes: > > > > Do you have: > > > > > > > > a

Re: Critical Sections for userland.

2007-10-04 Thread Alfred Perlstein
* Daniel Eischen <[EMAIL PROTECTED]> [071004 06:05] wrote: > > His point about telling us what you're really doing, so we might > off other ways to do it is valid. > > We don't know why you are using homegrown user-level spinlocks > instead of pthread mutexes. Priority ceiling mutexes and runnin

Re: Critical Sections for userland.

2007-10-04 Thread Alfred Perlstein
* Dag-Erling Sm??rgrav <[EMAIL PROTECTED]> [071004 03:28] wrote: > Alfred Perlstein <[EMAIL PROTECTED]> writes: > > It's not worth my time to engage someone with your mind set, you > > posses neither the technical nor interpersonal skill to be useful > > to me. > > This could be the beginning of a

Re: Critical Sections for userland.

2007-10-04 Thread Daniel Eischen
On Thu, 4 Oct 2007, Alfred Perlstein wrote: * Dag-Erling Sm??rgrav <[EMAIL PROTECTED]> [071004 03:01] wrote: Alfred Perlstein <[EMAIL PROTECTED]> writes: Do you have: a) Evidence or a paper to prove that this is a bad idea? I need evidence or a paper to prove that it is a bad idea to allow

Re: Critical Sections for userland.

2007-10-04 Thread Wilko Bulte
Quoting Alfred Perlstein, who wrote on Thu, Oct 04, 2007 at 03:19:02AM -0700 .. > * Dag-Erling Sm??rgrav <[EMAIL PROTECTED]> [071004 03:01] wrote: > > Alfred Perlstein <[EMAIL PROTECTED]> writes: > > > Do you have: > > > > > > a) Evidence or a paper to prove that this is a bad idea? > > > > I need

Re: Critical Sections for userland.

2007-10-04 Thread Dag-Erling Smørgrav
Alfred Perlstein <[EMAIL PROTECTED]> writes: > It's not worth my time to engage someone with your mind set, you > posses neither the technical nor interpersonal skill to be useful > to me. This could be the beginning of a wonderful friendship... > For context see my replies in this thread to Kip

Re: Critical Sections for userland.

2007-10-04 Thread Alfred Perlstein
* Dag-Erling Sm??rgrav <[EMAIL PROTECTED]> [071004 03:01] wrote: > Alfred Perlstein <[EMAIL PROTECTED]> writes: > > Do you have: > > > > a) Evidence or a paper to prove that this is a bad idea? > > I need evidence or a paper to prove that it is a bad idea to allow a > userland process to hold the

Re: Critical Sections for userland.

2007-10-04 Thread Dag-Erling Smørgrav
Alfred Perlstein <[EMAIL PROTECTED]> writes: > Do you have: > > a) Evidence or a paper to prove that this is a bad idea? I need evidence or a paper to prove that it is a bad idea to allow a userland process to hold the CPU indefinitely? > b) A helpful suggestion? Why don't you tell us what you'r

Re: Critical Sections for userland.

2007-10-04 Thread Alfred Perlstein
* Dag-Erling Sm??rgrav <[EMAIL PROTECTED]> [071004 02:05] wrote: > Alfred Perlstein <[EMAIL PROTECTED]> writes: > > Hi guys, we need critical sections for userland here. > > > > This is basically to avoid a process being switched out while holding > > a user level spinlock. > > Yeah, great idea, c

Re: Critical Sections for userland.

2007-10-04 Thread Dag-Erling Smørgrav
Alfred Perlstein <[EMAIL PROTECTED]> writes: > Hi guys, we need critical sections for userland here. > > This is basically to avoid a process being switched out while holding > a user level spinlock. Yeah, great idea, cooperative multitasking is the new black! DES -- Dag-Erling Smørgrav - [EMAIL

Re: Critical Sections for userland.

2007-10-02 Thread Alfred Perlstein
* Kip Macy <[EMAIL PROTECTED]> [071002 20:24] wrote: > See /sys/priority.h realtime is right below ithreads in terms of > priority. One of the big motivations for gang scheduling and part of > the reason why SMP guests often perform poorly is that apps / VMs > don't scale well if they're deschedul

Re: Critical Sections for userland.

2007-10-02 Thread Kip Macy
On 10/2/07, Alfred Perlstein <[EMAIL PROTECTED]> wrote: > * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > > > >Hi guys, we need critical sections for userland here. > > > > > >This is basically to avoid a process being switched out whil

Re: Critical Sections for userland.

2007-10-02 Thread Kip Macy
On 10/2/07, Daniel Eischen <[EMAIL PROTECTED]> wrote: > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > > * Daniel Eischen <[EMAIL PROTECTED]> [071002 20:02] wrote: > >> On Tue, 2 Oct 2007, Alfred Perlstein wrote: > >> > >>> * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > On Tue,

Re: Critical Sections for userland.

2007-10-02 Thread Alfred Perlstein
* Daniel Eischen <[EMAIL PROTECTED]> [071002 20:16] wrote: > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > >* Daniel Eischen <[EMAIL PROTECTED]> [071002 20:02] wrote: > >>On Tue, 2 Oct 2007, Alfred Perlstein wrote: > >> > >>>* Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > On Tue

Re: Critical Sections for userland.

2007-10-02 Thread Daniel Eischen
On Tue, 2 Oct 2007, Alfred Perlstein wrote: * Daniel Eischen <[EMAIL PROTECTED]> [071002 20:02] wrote: On Tue, 2 Oct 2007, Alfred Perlstein wrote: * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: On Tue, 2 Oct 2007, Alfred Perlstein wrote: Hi guys, we need critical sections for u

Re: Critical Sections for userland.

2007-10-02 Thread Alfred Perlstein
* Daniel Eischen <[EMAIL PROTECTED]> [071002 20:02] wrote: > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > >* Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > >>On Tue, 2 Oct 2007, Alfred Perlstein wrote: > >> > >>>Hi guys, we need critical sections for userland here. > >>> > >>>This i

Re: Critical Sections for userland.

2007-10-02 Thread Alfred Perlstein
* Kip Macy <[EMAIL PROTECTED]> [071002 20:00] wrote: > On 10/2/07, Alfred Perlstein <[EMAIL PROTECTED]> wrote: > > * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > > > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > > > > > >Hi guys, we need critical sections for userland here. > > > >

Re: Critical Sections for userland.

2007-10-02 Thread Daniel Eischen
On Tue, 2 Oct 2007, Alfred Perlstein wrote: * Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: On Tue, 2 Oct 2007, Alfred Perlstein wrote: Hi guys, we need critical sections for userland here. This is basically to avoid a process being switched out while holding a user level spinlock

Re: Critical Sections for userland.

2007-10-02 Thread Alfred Perlstein
* Daniel Eischen <[EMAIL PROTECTED]> [071002 19:46] wrote: > On Tue, 2 Oct 2007, Alfred Perlstein wrote: > > >Hi guys, we need critical sections for userland here. > > > >This is basically to avoid a process being switched out while holding > >a user level spinlock. > > Setting the scheduling cla

Re: Critical Sections for userland.

2007-10-02 Thread Daniel Eischen
On Tue, 2 Oct 2007, Alfred Perlstein wrote: Hi guys, we need critical sections for userland here. This is basically to avoid a process being switched out while holding a user level spinlock. Setting the scheduling class to real-time and using SCHED_FIFO and adjusting the thread priority aroun