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Re: CVS commit: [simonb-wapbl] src/sys/kern
On Jul 27, 2008, at 9:04 PM, Greg Oster wrote:
Module Name: src
Committed By: oster
Date: Mon Jul 28 04:04:32 UTC 2008
src/sys/kern [simonb-wapbl]: vfs_wapbl.c
Turn on WAPBL_DEBUG_SERIALIZE in order to use RW_WRITER locks instead
of RW_READER locks in wapbl_begin(). Include the following comment as
XXX: The original code calls for the use of a RW_READER lock
here, but it turns out there are performance issues with high
metadata-rate workloads (e.g. multiple simultaneous tar
extractions). For now, we force the lock to be RW_WRITER,
since that currently has the best performance characteristics
(even for a single tar-file extraction).
Uh, scary. Has anyone done any analysis of why this is so?
Approved by: simonb
To generate a diff of this commit:
cvs rdiff -r184.108.40.206 -r220.127.116.11 src/sys/kern/vfs_wapbl.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
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