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rcu: Force DEFAULT_RCU_BLIMIT to 1000 for strict RCU GPs
The value of DEFAULT_RCU_BLIMIT is normally set to 10, the idea being to avoid needless response-time degradation due to RCU callback invocation. However, when CONFIG_RCU_STRICT_GRACE_PERIOD=y it is better to avoid throttling callback execution in order to better detect pointer leaks from RCU read-side critical sections. This commit therefore sets the value of DEFAULT_RCU_BLIMIT to 1000 in kernels built with CONFIG_RCU_STRICT_GRACE_PERIOD=y. Reported-by Jann Horn <jannh@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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1 changed files with 7 additions and 6 deletions
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@ -468,17 +468,18 @@ static int rcu_is_cpu_rrupt_from_idle(void)
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return __this_cpu_read(rcu_data.dynticks_nesting) == 0;
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}
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#define DEFAULT_RCU_BLIMIT 10 /* Maximum callbacks per rcu_do_batch ... */
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#define DEFAULT_MAX_RCU_BLIMIT 10000 /* ... even during callback flood. */
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#define DEFAULT_RCU_BLIMIT (IS_ENABLED(CONFIG_RCU_STRICT_GRACE_PERIOD) ? 1000 : 10)
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// Maximum callbacks per rcu_do_batch ...
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#define DEFAULT_MAX_RCU_BLIMIT 10000 // ... even during callback flood.
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static long blimit = DEFAULT_RCU_BLIMIT;
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#define DEFAULT_RCU_QHIMARK 10000 /* If this many pending, ignore blimit. */
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#define DEFAULT_RCU_QHIMARK 10000 // If this many pending, ignore blimit.
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static long qhimark = DEFAULT_RCU_QHIMARK;
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#define DEFAULT_RCU_QLOMARK 100 /* Once only this many pending, use blimit. */
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#define DEFAULT_RCU_QLOMARK 100 // Once only this many pending, use blimit.
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static long qlowmark = DEFAULT_RCU_QLOMARK;
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#define DEFAULT_RCU_QOVLD_MULT 2
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#define DEFAULT_RCU_QOVLD (DEFAULT_RCU_QOVLD_MULT * DEFAULT_RCU_QHIMARK)
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static long qovld = DEFAULT_RCU_QOVLD; /* If this many pending, hammer QS. */
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static long qovld_calc = -1; /* No pre-initialization lock acquisitions! */
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static long qovld = DEFAULT_RCU_QOVLD; // If this many pending, hammer QS.
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static long qovld_calc = -1; // No pre-initialization lock acquisitions!
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module_param(blimit, long, 0444);
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module_param(qhimark, long, 0444);
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