diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/RCU/stallwarn.txt | 11 | ||||
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 13 |
2 files changed, 16 insertions, 8 deletions
diff --git a/Documentation/RCU/stallwarn.txt b/Documentation/RCU/stallwarn.txt index f48f4621ccbc..a360a8796710 100644 --- a/Documentation/RCU/stallwarn.txt +++ b/Documentation/RCU/stallwarn.txt @@ -225,18 +225,13 @@ an estimate of the total number of RCU callbacks queued across all CPUs In kernels with CONFIG_RCU_FAST_NO_HZ, more information is printed for each CPU: - 0: (64628 ticks this GP) idle=dd5/3fffffffffffffff/0 softirq=82/543 last_accelerate: a345/d342 Nonlazy posted: ..D + 0: (64628 ticks this GP) idle=dd5/3fffffffffffffff/0 softirq=82/543 last_accelerate: a345/d342 dyntick_enabled: 1 The "last_accelerate:" prints the low-order 16 bits (in hex) of the jiffies counter when this CPU last invoked rcu_try_advance_all_cbs() from rcu_needs_cpu() or last invoked rcu_accelerate_cbs() from -rcu_prepare_for_idle(). The "Nonlazy posted:" indicates lazy-callback -status, so that an "l" indicates that all callbacks were lazy at the start -of the last idle period and an "L" indicates that there are currently -no non-lazy callbacks (in both cases, "." is printed otherwise, as -shown above) and "D" indicates that dyntick-idle processing is enabled -("." is printed otherwise, for example, if disabled via the "nohz=" -kernel boot parameter). +rcu_prepare_for_idle(). "dyntick_enabled: 1" indicates that dyntick-idle +processing is enabled. If the grace period ends just as the stall warning starts printing, there will be a spurious stall-warning message, which will include diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index ade4e6ec23e0..ed83d6d90cc3 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3978,6 +3978,19 @@ test until boot completes in order to avoid interference. + rcuperf.kfree_rcu_test= [KNL] + Set to measure performance of kfree_rcu() flooding. + + rcuperf.kfree_nthreads= [KNL] + The number of threads running loops of kfree_rcu(). + + rcuperf.kfree_alloc_num= [KNL] + Number of allocations and frees done in an iteration. + + rcuperf.kfree_loops= [KNL] + Number of loops doing rcuperf.kfree_alloc_num number + of allocations and frees. + rcuperf.nreaders= [KNL] Set number of RCU readers. The value -1 selects N, where N is the number of CPUs. A value |
