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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-06-24 10:15:02 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-07-02 12:34:43 -0700 |
| commit | 9d2ad24306f2fafc3612e5a216aab31f9e56e879 (patch) | |
| tree | 6ced8145e842e29aaedda3d9453c74b6f0c92b4f /kernel/rcutree.h | |
| parent | 4fa3b6cb1bc8c14b81b4c8ffdfd3f2500a7e9367 (diff) | |
| download | linux-9d2ad24306f2fafc3612e5a216aab31f9e56e879.tar.gz linux-9d2ad24306f2fafc3612e5a216aab31f9e56e879.tar.bz2 linux-9d2ad24306f2fafc3612e5a216aab31f9e56e879.zip | |
rcu: Make RCU_FAST_NO_HZ respect nohz= boot parameter
If the nohz= boot parameter disables nohz, then RCU_FAST_NO_HZ needs to
also disable itself. This commit therefore checks for tick_nohz_enabled
being zero, disabling rcu_prepare_for_idle() if so. This commit assumes
that tick_nohz_enabled can change at runtime: If this is not the case,
then a simpler approach suffices.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.h')
| -rw-r--r-- | kernel/rcutree.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h index 19b61ac1079f..e978845c6800 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -97,6 +97,7 @@ struct rcu_dynticks { /* # times non-lazy CBs posted to CPU. */ unsigned long nonlazy_posted_snap; /* idle-period nonlazy_posted snapshot. */ + int tick_nohz_enabled_snap; /* Previously seen value from sysfs. */ #endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */ }; |