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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-05 23:04:22 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2015-05-27 12:59:07 -0700 |
| commit | 1ce46ee597bc36fde6984e91aecc2d662a754199 (patch) | |
| tree | e8168043f8921ac78f74c88144918b1b4d4509fb /lib/Kconfig.debug | |
| parent | e72aeafc66060d3fc6b4d2120db00058572b3186 (diff) | |
| download | lwn-1ce46ee597bc36fde6984e91aecc2d662a754199.tar.gz lwn-1ce46ee597bc36fde6984e91aecc2d662a754199.zip | |
rcu: Conditionally compile RCU's eqs warnings
This commit applies some warning-omission micro-optimizations to RCU's
various extended-quiescent-state functions, which are on the kernel/user
hotpath for CONFIG_NO_HZ_FULL=y.
Reported-by: Rik van Riel <riel@redhat.com>
Reported by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c4e1cf04cf57..b908048f8d6a 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1373,6 +1373,17 @@ config RCU_TRACE Say Y here if you want to enable RCU tracing Say N if you are unsure. +config RCU_EQS_DEBUG + bool "Use this when adding any sort of NO_HZ support to your arch" + depends on DEBUG_KERNEL + help + This option provides consistency checks in RCU's handling of + NO_HZ. These checks have proven quite helpful in detecting + bugs in arch-specific NO_HZ code. + + Say N here if you need ultimate kernel/user switch latencies + Say Y if you are unsure + endmenu # "RCU Debugging" config DEBUG_BLOCK_EXT_DEVT |