HEADS UP - massive kqueue changes now in HEAD, and also basic lvm/dm

Samuel J. Greear sjg at evilcode.net
Fri Jul 23 06:40:30 PDT 2010

On Fri, Jul 23, 2010 at 4:30 AM, YONETANI Tomokazu <qhwt+dfly at les.ath.cx> wrote:
> On Mon, Jul 19, 2010 at 06:18:52PM -0700, Matthew Dillon wrote:
>>     Sam's select/poll infrastructure removal project is now in HEAD.  This
>>     project reimplements the kernel's select() and poll() system calls using
>>     per-thread kqueues and removes the original select/poll infrastructure.
>>     We expect there to be some bugs so anyone running HEAD please report
>>     issues where (primarily) programs wind up blocking on something and
>>     not waking up when they should, or if the system crashes or deadlocks
>>     when it did not before.
> After the select/poll change, closing a window in GNU screen takes
> about 10 second if the program running in that window was either
> /bin/sh, /bin/csh, or /bin/tcsh.  Top doesn't take 10 second to terminate,
> so it appears like specific to shells, but bash from pkgsrc is also not
> affected.
> I attached gdb to the backend process of GNU screen and found that
> the 10-second delay is caused by the call to select() in sched().
> Cheers.


I apologize, I am not a screen user, can you tell me the appropriate
magic incantation to reproduce this?


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