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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-03 11:34:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-03 11:34:53 -0700
commit330e9e46253cbfab178450c976aa90ef0f3ae940 (patch)
tree4a9875d264a477449a9c9a0ff23937550d1c3234 /Documentation/admin-guide
parente94693f797400b9f424c69e1da9381e4846762fe (diff)
parent567b64aaefc4ef9ae3af124ae0b13dc13a6804a8 (diff)
downloadblackbird-obmc-linux-330e9e46253cbfab178450c976aa90ef0f3ae940.tar.gz
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Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU updates from Ingo Molnar: "The sole purpose of these changes is to shrink and simplify the RCU code base, which has suffered from creeping bloat over the past couple of years. The end result is a net removal of ~2700 lines of code: 79 files changed, 1496 insertions(+), 4211 deletions(-) Plus there's a marked reduction in the Kconfig space complexity as well, here's the number of matches on 'grep RCU' in the .config: before after x86-defconfig 17 15 x86-allmodconfig 33 20" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (86 commits) rcu: Remove RCU CPU stall warnings from Tiny RCU rcu: Remove event tracing from Tiny RCU rcu: Move RCU debug Kconfig options to kernel/rcu rcu: Move RCU non-debug Kconfig options to kernel/rcu rcu: Eliminate NOCBs CPU-state Kconfig options rcu: Remove debugfs tracing srcu: Remove Classic SRCU srcu: Fix rcutorture-statistics typo rcu: Remove SPARSE_RCU_POINTER Kconfig option rcu: Remove the now-obsolete PROVE_RCU_REPEATEDLY Kconfig option rcu: Remove typecheck() from RCU locking wrapper functions rcu: Remove #ifdef moving rcu_end_inkernel_boot from rcupdate.h rcu: Remove nohz_full full-system-idle state machine rcu: Remove the RCU_KTHREAD_PRIO Kconfig option rcu: Remove *_SLOW_* Kconfig options srcu: Use rnp->lock wrappers to replace explicit memory barriers rcu: Move rnp->lock wrappers for SRCU use rcu: Convert rnp->lock wrappers to macros for SRCU use rcu: Refactor #includes from include/linux/rcupdate.h bcm47xx: Fix build regression ...
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt41
1 files changed, 31 insertions, 10 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 7737ab5d04b2..f59aad5c2270 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3238,21 +3238,17 @@
rcutree.gp_cleanup_delay= [KNL]
Set the number of jiffies to delay each step of
- RCU grace-period cleanup. This only has effect
- when CONFIG_RCU_TORTURE_TEST_SLOW_CLEANUP is set.
+ RCU grace-period cleanup.
rcutree.gp_init_delay= [KNL]
Set the number of jiffies to delay each step of
- RCU grace-period initialization. This only has
- effect when CONFIG_RCU_TORTURE_TEST_SLOW_INIT
- is set.
+ RCU grace-period initialization.
rcutree.gp_preinit_delay= [KNL]
Set the number of jiffies to delay each step of
RCU grace-period pre-initialization, that is,
the propagation of recent CPU-hotplug changes up
- the rcu_node combining tree. This only has effect
- when CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT is set.
+ the rcu_node combining tree.
rcutree.rcu_fanout_exact= [KNL]
Disable autobalancing of the rcu_node combining
@@ -3328,6 +3324,17 @@
This wake_up() will be accompanied by a
WARN_ONCE() splat and an ftrace_dump().
+ rcuperf.gp_async= [KNL]
+ Measure performance of asynchronous
+ grace-period primitives such as call_rcu().
+
+ rcuperf.gp_async_max= [KNL]
+ Specify the maximum number of outstanding
+ callbacks per writer thread. When a writer
+ thread exceeds this limit, it invokes the
+ corresponding flavor of rcu_barrier() to allow
+ previously posted callbacks to drain.
+
rcuperf.gp_exp= [KNL]
Measure performance of expedited synchronous
grace-period primitives.
@@ -3355,17 +3362,22 @@
rcuperf.perf_runnable= [BOOT]
Start rcuperf running at boot time.
+ rcuperf.perf_type= [KNL]
+ Specify the RCU implementation to test.
+
rcuperf.shutdown= [KNL]
Shut the system down after performance tests
complete. This is useful for hands-off automated
testing.
- rcuperf.perf_type= [KNL]
- Specify the RCU implementation to test.
-
rcuperf.verbose= [KNL]
Enable additional printk() statements.
+ rcuperf.writer_holdoff= [KNL]
+ Write-side holdoff between grace periods,
+ in microseconds. The default of zero says
+ no holdoff.
+
rcutorture.cbflood_inter_holdoff= [KNL]
Set holdoff time (jiffies) between successive
callback-flood tests.
@@ -3803,6 +3815,15 @@
spia_pedr=
spia_peddr=
+ srcutree.counter_wrap_check [KNL]
+ Specifies how frequently to check for
+ grace-period sequence counter wrap for the
+ srcu_data structure's ->srcu_gp_seq_needed field.
+ The greater the number of bits set in this kernel
+ parameter, the less frequently counter wrap will
+ be checked for. Note that the bottom two bits
+ are ignored.
+
srcutree.exp_holdoff [KNL]
Specifies how many nanoseconds must elapse
since the end of the last SRCU grace period for
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