Date: Tue, 04 Jun 2002 18:09:20 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: RE: cvs commit: src/sys/kern kern_mutex.c Message-ID: <XFMail.20020604180920.jhb@FreeBSD.org> In-Reply-To: <200206042153.g54LrmT07436@freefall.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 04-Jun-2002 John Baldwin wrote: > jhb 2002/06/04 14:53:48 PDT > > Modified files: > sys/kern kern_mutex.c > Log: > Optimize the adaptive mutex spin a bit. Use a simple while loop with > simple reads (and on IA32, a "pause" instruction for each interation of the > loop) to spin until either the mutex owner field changes, or the lock owner > stops executing. > > Suggested by: tanimura > Tested on: i386 Not tested on Alpha SMP because SMP Alpha kernels aren't stable under load now. I've had various lockups or weird NULL pointer bugs (as if a thread variable passed down the stack suddenly became NULL) for a month or two now. SMP sparc64 doesn't boot atm, hence no testing on it. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?XFMail.20020604180920.jhb>