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Subjectsched: context tracking demolishes pipe-test
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Date
taskset -c 3 pipe-test 1

switch-rate
3.10.0-master 426.4 KHz
3.10.0-masterx 591.8 Khz 1.387 (591=notgood, 426=omfg)

3.10.0-master 3.10.0-masterx
7.13% [k] __schedule 9.58% [k] __schedule
! 6.02% [.] __read_nocancel 8.25% [k] system_call
! 5.82% [.] __write_nocancel 5.34% [k] _raw_spin_lock_irqsave
! 4.28% [k] system_call 4.26% [k] pipe_read
! 4.13% [k] user_exit 3.53% [k] copy_user_generic_string
3.64% [k] _raw_spin_lock_irqsave 3.52% [k] native_sched_clock
3.37% [k] pipe_read 3.43% [k] __switch_to
2.72% [k] copy_user_generic_string 3.21% [.] main
2.60% [.] main 2.96% [k] mutex_lock
2.59% [k] native_sched_clock 2.89% [k] mutex_unlock
2.47% [k] __switch_to 2.86% [k] sched_clock_local
2.10% [k] mutex_unlock 2.63% [.] __read_nocancel
2.08% [k] sched_clock_local 2.47% [k] pipe_write
2.05% [k] mutex_lock 2.37% [k] _raw_spin_unlock_irqrestore
1.91% [k] pipe_write 1.96% [.] __write_nocancel
1.89% [k] user_enter 1.62% [k] vfs_write
1.72% [k] _raw_spin_unlock_irqrestore 1.54% [k] do_sync_write
1.51% [k] rcu_eqs_enter_common.isra.47 1.52% [k] fget_light
1.41% [k] rcu_eqs_exit_common.isra.45 1.48% [k] fsnotify
1.30% [k] tracesys 1.39% [k] dequeue_task_fair
1.23% [k] fsnotify 1.39% [k] update_curr
1.23% [k] int_check_syscall_exit_worka 1.37% [k] do_sync_read
1.20% [k] fget_light 1.33% [.] __GI___libc_write
1.16% [k] vfs_write 1.29% [k] try_to_wake_up
1.05% [k] syscall_trace_enter 1.09% [k] _raw_spin_lock_irq
1.04% [k] do_sync_write 1.08% [k] pipe_iov_copy_from_user
1.03% [k] context_tracking_task_switch 1.05% [k] finish_task_switch
0.99% [k] update_curr 1.04% [k] prepare_to_wait

marge:/usr/local/src/kernel/linux-3.x.git # diff -up config.horrible config.not-as-bad
--- config.horrible 2013-06-30 08:38:47.785258079 +0200
+++ config.not-as-bad 2013-06-30 08:33:08.246761153 +0200
@@ -48,7 +48,7 @@ CONFIG_BUILDTIME_EXTABLE_SORT=y
#
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_CROSS_COMPILE=""
-CONFIG_LOCALVERSION="-master"
+CONFIG_LOCALVERSION="-masterx"
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_HAVE_KERNEL_GZIP=y
CONFIG_HAVE_KERNEL_BZIP2=y
@@ -126,7 +126,7 @@ CONFIG_TREE_RCU=y
CONFIG_RCU_STALL_COMMON=y
CONFIG_CONTEXT_TRACKING=y
CONFIG_RCU_USER_QS=y
-CONFIG_CONTEXT_TRACKING_FORCE=y
+# CONFIG_CONTEXT_TRACKING_FORCE is not set
CONFIG_RCU_FANOUT=64
CONFIG_RCU_FANOUT_LEAF=16
# CONFIG_RCU_FANOUT_EXACT is not set
marge:/usr/local/src/kernel/linux-3.x.git # grep NO_HZ .config
CONFIG_NO_HZ_COMMON=y
CONFIG_NO_HZ_IDLE=y
# CONFIG_NO_HZ_FULL is not set
CONFIG_NO_HZ=y
# CONFIG_RCU_FAST_NO_HZ is not set




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