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author | Valentin Schneider <vschneid@redhat.com> | 2024-04-16 10:52:03 +0200 |
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committer | Neeraj Upadhyay <neeraj.upadhyay@kernel.org> | 2024-08-11 07:41:10 +0200 |
commit | dc5fface4b30508933b515a4985401c8c8f6bcfd (patch) | |
tree | a3ab6c76f2f9203da5e27f3aa9b00d8c7480a453 /Documentation/RCU | |
parent | context_tracking, rcu: Rename ct_dynticks_nesting_cpu() into ct_nesting_cpu() (diff) | |
download | linux-dc5fface4b30508933b515a4985401c8c8f6bcfd.tar.xz linux-dc5fface4b30508933b515a4985401c8c8f6bcfd.zip |
context_tracking, rcu: Rename struct context_tracking .dynticks_nmi_nesting into .nmi_nesting
The context_tracking.state RCU_DYNTICKS subvariable has been renamed to
RCU_WATCHING, and the 'dynticks' prefix can be dropped without losing any
meaning.
[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]
Suggested-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Diffstat (limited to 'Documentation/RCU')
-rw-r--r-- | Documentation/RCU/Design/Data-Structures/Data-Structures.rst | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/RCU/Design/Data-Structures/Data-Structures.rst b/Documentation/RCU/Design/Data-Structures/Data-Structures.rst index 69860bbec202..28d9f9e1783f 100644 --- a/Documentation/RCU/Design/Data-Structures/Data-Structures.rst +++ b/Documentation/RCU/Design/Data-Structures/Data-Structures.rst @@ -936,7 +936,7 @@ This portion of the rcu_data structure is declared as follows: :: 1 long nesting; - 2 long dynticks_nmi_nesting; + 2 long nmi_nesting; 3 atomic_t dynticks; 4 bool rcu_need_heavy_qs; 5 bool rcu_urgent_qs; @@ -948,11 +948,11 @@ the corresponding CPU (and from tracing) unless otherwise stated. The ``->nesting`` field counts the nesting depth of process execution, so that in normal circumstances this counter has value zero or one. NMIs, irqs, and tracers are counted by the -``->dynticks_nmi_nesting`` field. Because NMIs cannot be masked, changes +``->nmi_nesting`` field. Because NMIs cannot be masked, changes to this variable have to be undertaken carefully using an algorithm provided by Andy Lutomirski. The initial transition from idle adds one, and nested transitions add two, so that a nesting level of five is -represented by a ``->dynticks_nmi_nesting`` value of nine. This counter +represented by a ``->nmi_nesting`` value of nine. This counter can therefore be thought of as counting the number of reasons why this CPU cannot be permitted to enter dyntick-idle mode, aside from process-level transitions. @@ -961,11 +961,11 @@ However, it turns out that when running in non-idle kernel context, the Linux kernel is fully capable of entering interrupt handlers that never exit and perhaps also vice versa. Therefore, whenever the ``->nesting`` field is incremented up from zero, the -``->dynticks_nmi_nesting`` field is set to a large positive number, and +``->nmi_nesting`` field is set to a large positive number, and whenever the ``->nesting`` field is decremented down to zero, -the ``->dynticks_nmi_nesting`` field is set to zero. Assuming that +the ``->nmi_nesting`` field is set to zero. Assuming that the number of misnested interrupts is not sufficient to overflow the -counter, this approach corrects the ``->dynticks_nmi_nesting`` field +counter, this approach corrects the ``->nmi_nesting`` field every time the corresponding CPU enters the idle loop from process context. @@ -993,7 +993,7 @@ code. | **Quick Quiz**: | +-----------------------------------------------------------------------+ | Why not simply combine the ``->nesting`` and | -| ``->dynticks_nmi_nesting`` counters into a single counter that just | +| ``->nmi_nesting`` counters into a single counter that just | | counts the number of reasons that the corresponding CPU is non-idle? | +-----------------------------------------------------------------------+ | **Answer**: | |