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    SubjectRe: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

    * Willy Tarreau <w@1wt.eu> wrote:

    > On Sat, Apr 14, 2007 at 03:01:01PM +0200, Willy Tarreau wrote:
    > >
    > > Well, I'll stop heating the room for now as I get out of ideas about how
    > > to defeat it.
    >
    > Ah, I found something nasty.
    > If I start large batches of processes like this :
    >
    > $ for i in $(seq 1 1000); do ./scheddos2 4000 4000 & done
    >
    > the ramp up slows down after 700-800 processes, but something very
    > strange happens. If I'm under X, I can switch the focus to all xterms
    > (the WM is still alive) but all xterms are frozen. On the console,
    > after one moment I simply cannot switch to another VT anymore while I
    > can still start commands locally. But "chvt 2" simply blocks. SysRq-K
    > killed everything and restored full control. Dmesg shows lots of :

    > SAK: killed process xxxx (scheddos2): process_session(p)==tty->session.
    >
    > I wonder if part of the problem would be too many processes bound to
    > the same tty :-/

    hm, that's really weird. I've Cc:-ed the tty experts (Erik, Jiri, Alan),
    maybe this description rings a bell with them?

    Ingo
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