Re: [PATCH] IA32 SMP spinlock metering

Chuck Lever (cel@monkey.org)
Tue, 5 Oct 1999 16:06:11 -0400 (EDT)

On Tue, 5 Oct 1999, John Hawkes wrote:
> Further investigation using hold-time analysis showed that the biggest
> kernel_flag pig in 2.3.11 is sys_close(), which holds the kernel_flag for as
> long as 10-13 milliseconds (on a 400 MHz Xeon CPU) on a regular basis.

sys_open, sys_close, and the *stat system calls can hold the kernel lock
for a long time. i believe that adding separate locking for the dentry
cache and cleaning up locking in the file system will help this. is
anyone working on these projects? will this work appear in 2.4, or is it
a 2.5 project? thanks for any info.

- Chuck Lever

--
corporate:	<chuckl@netscape.com>
personal:	<chucklever@netscape.net> or <cel@monkey.org>


The Linux Scalability project:
	http://www.citi.umich.edu/projects/linux-scalability/




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