Date: Sat, 20 Jan 2001 23:31:30 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Jake Burkholder <jake@FreeBSD.org> Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: RE: cvs commit: src/sys/i386/include globals.h Message-ID: <XFMail.010120233130.jhb@FreeBSD.org> In-Reply-To: <200101210311.f0L3B3k73993@freefall.freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 21-Jan-01 Jake Burkholder wrote: > jake 2001/01/20 19:11:03 PST > > Modified files: > sys/i386/include globals.h > Log: > Implement optimized PCPU accessors. These are necessary to support a > pre-emptable kernel. For variables of size 4 bytes or less they compile > to a single instruction, which does not allow a process to migrate cpus > in the middle, and get the value for the "wrong" cpu. Many per-cpu variables, esp. structs, will probably need to be protected via locks. curproc and other thread-related variables shouldn't be affected by preemption, however. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "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.010120233130.jhb>