Subject: Re: Speeding up fork/wait path
To: Jaromir Dolecek <jdolecek@NetBSD.org>
From: Jason Thorpe <email@example.com>
Date: 11/02/2003 11:50:50
On Sunday, November 2, 2003, at 11:06 AM, Jaromir Dolecek wrote:
> I implemented similar solution.
> Exiting process now:
> 1. pmap_deactivate()s the address space and frees the vmspace
> 2. runs cpu_wait() (tears down TSS on i386 & amd64)
> 3. makes the process SZOMB
> 4. keeps KERNEL_PROC_LOCK()
This is pretty cool.
* Rename cpu_wait() to cpu_exit().
* Also drain u-areas when allocating VM from kernel_map
fails (then retry).
Have you done the fork/exit benchmark before and after this change? I
would also do a 4-job build of the source tree with this change to
heavily exercise the fork/exit/wait code path.
-- Jason R. Thorpe <firstname.lastname@example.org>