Re: [PATCH] Staircase scheduler v7.4

From: Willy Tarreau (willy_at_w.ods.org)
Date: 06/25/04

  • Next message: Jörn Engel: "Re: [PATCH] A generic_file_sendpage()" 
    Date:	Fri, 25 Jun 2004 21:05:33 +0200
To: Michael Buesch <mbuesch@freenet.de>

    Hi Michael,

    On Fri, Jun 25, 2004 at 08:44:22PM +0200, Michael Buesch wrote:
     
    > I don't know what the file wchan is good for, but here is
    > it's output:
    > mb@lfs:/proc/11000> cat wchan
    > sys_wait4

    I bet the process is waiting for a SIGCHLD from a previously forked
    process. Con, would it be possible that under some circumstances,
    a process does not receive a SIGCHLD anymore, eg if the child runs
    shorter than a full timeslice or something like that ? In autoconf
    scripts, there are lots of very short operations that might trigger
    such unique cases.

    Cheers,
    Willy

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

  • Next message: Jörn Engel: "Re: [PATCH] A generic_file_sendpage()"

    Relevant Pages

    • Re: 2.6.14-rc1 wait()/SIG_CHILD bevahiour
      ... On Mon, 19 Sep 2005, Badari Pulavarty wrote: ... I don't think it is SIGCHLD, because you can "strace" the waiter in one ... window, and send it a SIGCHLD _by_hand_ in the other window, and it will ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)
    • Re: BUG: NTPL: waitpid() doesnt return?
      ... The above trace clearly shows that #31346 has ... child processes have exit_grouped. ... No SIGCHLD has been installed. ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)
    • Re: PROBLEM: Failure to deliver SIGCHLD
      ... The server employs a very simple SIGCHLD handler that loops on ... until all zombie processes have been collected. ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)
    • Re: is killing zombies possible w/o a reboot?
      ... >>could try sending a SIGCHLD to the parent and see if it does something ... It won't hurt init, but some processes do use the SIGCHLD to trigger a ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)