Date: Sat, 28 Dec 1996 18:45:32 -0800 (PST) From: John Dyson <dyson> To: CVS-committers, cvs-all, cvs-sys Subject: cvs commit: src/sys/gnu/ext2fs ext2_readwrite.c src/sys/isofs/cd9660 cd9660_vnops.c src/sys/kern kern_descrip.c vfs_cluster.c vfs_subr.c vfs_vnops.c src/sys/sys buf.h file.h filedesc.h vnode.h src/sys/ufs/ufs ufs_readwrite.c Message-ID: <199612290245.SAA09849@freefall.freebsd.org>
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dyson 96/12/28 18:45:31
Modified: sys/gnu/ext2fs ext2_readwrite.c
Log:
This commit is the embodiment of some VFS read clustering improvements.
Firstly, now our read-ahead clustering is on a file descriptor basis and not
on a per-vnode basis. This will allow multiple processes reading the
same file to take advantage of read-ahead clustering. Secondly, there
previously was a problem with large reads still using the ramp-up
algorithm. Of course, that was bogus, and now we read the entire
"chunk" off of the disk in one operation. The read-ahead clustering
algorithm should use less CPU than the previous also (I hope :-)).
Revision Changes Path
1.6 +2 -1 src/sys/gnu/ext2fs/ext2_readwrite.c
Modified: sys/isofs/cd9660 cd9660_vnops.c
sys/kern kern_descrip.c vfs_cluster.c vfs_subr.c
vfs_vnops.c
sys/sys buf.h file.h filedesc.h vnode.h
sys/ufs/ufs ufs_readwrite.c
Log:
This commit is the embodiment of some VFS read clustering improvements.
Firstly, now our read-ahead clustering is on a file descriptor basis and not
on a per-vnode basis. This will allow multiple processes reading the
same file to take advantage of read-ahead clustering. Secondly, there
previously was a problem with large reads still using the ramp-up
algorithm. Of course, that was bogus, and now we read the entire
"chunk" off of the disk in one operation. The read-ahead clustering
algorithm should use less CPU than the previous also (I hope :-)).
NOTE: THAT LKMS MUST BE REBUILT!!!
Revision Changes Path
1.28 +3 -2 src/sys/isofs/cd9660/cd9660_vnops.c
1.35 +2 -1 src/sys/kern/kern_descrip.c
1.40 +181 -127 src/sys/kern/vfs_cluster.c
1.66 +1 -3 src/sys/kern/vfs_subr.c
1.27 +35 -3 src/sys/kern/vfs_vnops.c
1.36 +4 -3 src/sys/sys/buf.h
1.10 +8 -1 src/sys/sys/file.h
1.9 +3 -1 src/sys/sys/filedesc.h
1.37 +1 -3 src/sys/sys/vnode.h
1.24 +10 -8 src/sys/ufs/ufs/ufs_readwrite.c
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