git: kernel - Remove unnecessary mplock from ata I/O path
Matthew Dillon
dillon at crater.dragonflybsd.org
Mon Dec 10 15:00:31 PST 2012
commit cf5f86b6a177ae06633f7456d6414de7aca47f1b
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Mon Dec 10 14:59:38 2012 -0800
kernel - Remove unnecessary mplock from ata I/O path
* ata_finish() doesn't need the MP Lock; moving it from taskqueue_swi
to taskqueue_swi_mp will make sure it's not taken.
* Note that taskqueue_swi(_mp) will be processed when this ithread
attempts to switch back to the thread it preempted. This means that
taskqueue_swi(_mp) processing exclude processing further interrupts
on the ithread while they're running. This may not be desirable and
is different than taskqueue_swi / swi_* / setsoft* in FreeBSD 4.x.
Submitted-by: vsrinivas
Summary of changes:
sys/dev/disk/nata/ata-queue.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/cf5f86b6a177ae06633f7456d6414de7aca47f1b
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