git: dsched - Add request polling wrapper
commit 09f2bfe9d39a346abddc196cafc213e571044dfb
Author: Brills Peng <brills@gmail.com>
Date: Sat Aug 27 11:24:35 2011 +0000
dsched - Add request polling wrapper
* Add a request polling emulation layer to dsched. This emulated
request polling as if a disk driver would poll for requests instead
of requests being actively pushed down.
* The policy->polling_func() callback is called whenever a BIO
completes.
* A field in the diskctx that shows the current tag queue depth and the
maximum tag queue depth (currently fixed value of 32) are used in the
policies using request polling directly and is not enforced in the
dsched layer. That is, a policy using request polling emulation
should take care of not having (many) more BIOs in flight than
max_tag_queue_depth.
Sponsored-by: Google Summer of Code
Summary of changes:
sys/kern/kern_dsched.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++
sys/sys/dsched.h | 11 +++++++-
2 files changed, 79 insertions(+), 1 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/09f2bfe9d39a346abddc196cafc213e571044dfb
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