#!/bin/sh # description: event trigger - test event enable/disable trigger do_reset() { reset_trigger echo > set_event clear_trace } fail() { #msg do_reset echo $1 exit $FAIL } if [ ! -f set_event -o ! -d events/sched ]; then echo "event tracing is not supported" exit_unsupported fi if [ ! -f events/sched/sched_process_fork/trigger ]; then echo "event trigger is not supported" exit_unsupported fi reset_tracer do_reset FEATURE=`grep enable_event events/sched/sched_process_fork/trigger` if [ -z "$FEATURE" ]; then echo "event enable/disable trigger is not supported" exit_unsupported fi echo "Test enable_event trigger" echo 0 > events/sched/sched_switch/enable echo 'enable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger ( echo "forked") if [ `cat events/sched/sched_switch/enable` != '1*' ]; then fail "enable_event trigger on sched_process_fork did not work" fi reset_trigger echo "Test disable_event trigger" echo 1 > events/sched/sched_switch/enable echo 'disable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger ( echo "forked") if [ `cat events/sched/sched_switch/enable` != '0*' ]; then fail "disable_event trigger on sched_process_fork did not work" fi reset_trigger echo "Test semantic error for event enable/disable trigger" ! echo 'enable_event:nogroup:noevent' > events/sched/sched_process_fork/trigger ! echo 'disable_event+1' > events/sched/sched_process_fork/trigger echo 'enable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger ! echo 'enable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger ! echo 'disable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger do_reset exit 0 gi/linux/net-next.git/tree/sound/firewire/oxfw/oxfw-pcm.c?id=433e19cf33d34bb6751c874a9c00980552fe508c'>treecommitdiff
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /sound/firewire/oxfw/oxfw-pcm.c
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/firewire/oxfw/oxfw-pcm.c')