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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-05-11 21:26:22 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-06-09 04:52:39 +0300 |
| commit | fe5ac724d81a3c7803e60c2232718f212f3f38d4 (patch) | |
| tree | 2e0f8316cd8a2c3f5d67bde225aa5c7cfa7be7a5 /Documentation/RCU | |
| parent | f7a10a975036ef9ca957bfe12ab2d4b1a46cccd1 (diff) | |
| download | linux-fe5ac724d81a3c7803e60c2232718f212f3f38d4.tar.xz | |
rcu: Remove nohz_full full-system-idle state machine
The NO_HZ_FULL_SYSIDLE full-system-idle capability was added in 2013
by commit 0edd1b1784cb ("nohz_full: Add full-system-idle state machine"),
but has not been used. This commit therefore removes it.
If it turns out to be needed later, this commit can always be reverted.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/RCU')
| -rw-r--r-- | Documentation/RCU/Design/Requirements/Requirements.html | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/Documentation/RCU/Design/Requirements/Requirements.html b/Documentation/RCU/Design/Requirements/Requirements.html index cb614f2a69c2..8c94fc1d1c84 100644 --- a/Documentation/RCU/Design/Requirements/Requirements.html +++ b/Documentation/RCU/Design/Requirements/Requirements.html @@ -2520,11 +2520,7 @@ It is similarly socially unacceptable to interrupt an <tt>nohz_full</tt> CPU running in userspace. RCU must therefore track <tt>nohz_full</tt> userspace execution. -And in -<a href="https://lwn.net/Articles/558284/"><tt>CONFIG_NO_HZ_FULL_SYSIDLE=y</tt></a> -kernels, RCU must separately track idle CPUs on the one hand and -CPUs that are either idle or executing in userspace on the other. -In both cases, RCU must be able to sample state at two points in +RCU must therefore be able to sample state at two points in time, and be able to determine whether or not some other CPU spent any time idle and/or executing in userspace. |