CVS commit: src/sys/rump/librump/rumpvfs

["Antti Kantee" <pooka%netbsd.org@localhost>]

Module Name:    src
Committed By:   pooka
Date:           Mon Apr 29 13:07:37 UTC 2013

Modified Files:
        src/sys/rump/librump/rumpvfs: rumpblk.c

Log Message:
rework bio hypercalls, part 2:

Nuke all the policy hacks (r/w, mmap, directio) from the paravirtualized
block driver and let the hypervisor decide how it wants to optimize
the I/O.  It can prepare for this based on if a file is opened with
the RUMPUSER_OPEN_BIO flag.

mmap was not faster than r/w except in a niche case (yes, it made a
good measurement), and directio was never on by default since
it was tricky at best to decide on the kernel side of things if
directio will do the right thing.


To generate a diff of this commit:
cvs rdiff -u -r1.49 -r1.50 src/sys/rump/librump/rumpvfs/rumpblk.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.