Re: 6.0 Witness squawk

From: John-Mark Gurney (gurney_j_at_resnet.uoregon.edu)
Date: 10/25/04

  • Next message: John-Mark Gurney: "Re: FreeBSD 5.3b7and poor ata performance" 
    Date: Mon, 25 Oct 2004 10:14:45 -0700
To: Sam <sah@softcardsystems.com>

    Sam wrote this message on Mon, Oct 25, 2004 at 12:22 -0500:
    > >Sam <sah@softcardsystems.com> writes:
    > >>There are three entry points into the driver. 1) The disk
    > >>layer 2) the netisr routine 3) the rexmit timer.
    > >
    > >AFAIK, if the code that calls malloc() can be reached from 2) or 3),
    > >you're not allowed to use M_WAITOK.
    >
    > Hm. If that's true then I've either got to petition you
    > fellas to change disk_alloc(), disk_create(), and disk_destroy()
    > to use M_NOWAIT or schedule a callback where these calls
    > can be handled properly.
    >
    > Thoughts about either approach?

    I'd go and do a callback.. You can do that using the generic taskqueue
    setup for this task... It's not an event that happens often, so the
    delay to schedule and execute won't be significant...

    Changing disk_alloc and friends to use M_NOWAIT would have significant
    implications to other code... 

    -- 
  John-Mark Gurney				Voice: +1 415 225 5579
     "All that I will do, has been done, All that I have, has not."
_______________________________________________
freebsd-current@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
  • Next message: John-Mark Gurney: "Re: FreeBSD 5.3b7and poor ata performance"

    Relevant Pages

    • Re: 6.0 Witness squawk
      ... If that's true then I've either got to petition you ... I'd go and do a callback.. ... delay to schedule and execute won't be significant... ... implications to other code... ...
      (freebsd-arch)
    • Re: [PATCH] Export current_is_keventd() for libphy
      ... PHY interrupt occurs) ... needs to flush the queue. ... So it's some other queued-up callback which takes rtnl_lock. ... Maciej's solution is to schedule phy_disconnectto be called from a ...
      (Linux-Kernel)
    • Re: A smallish Tkinter question
      ... A one second delay, see the window with a 1 in it, and then nothing appears to happen. ... If you change run to loop forever, it won't return and you will never even get to the mainloop() call. ... Here is a program that uses a callback to display a ticker: ... # Schedule the initial callback ...
      (comp.lang.python)