* [0/5] rcu doc updates
@ 2018-09-25 18:25 Joel Fernandes (Google)
2018-09-25 18:25 ` [1/5] doc: rcu: Update information about resched_cpu Joel Fernandes (Google)
` (6 more replies)
0 siblings, 7 replies; 9+ messages in thread
From: Joel Fernandes (Google) @ 2018-09-25 18:25 UTC (permalink / raw)
To: linux-kernel
Cc: Joel Fernandes (Google),
Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
Hi Paul,
These patches are documentation updates for the rcu_dynticks rolling into
rcu_data and also the updates to the fact that there's a single rcu_state now.
Its based on your rcu/dev branch.
Next I'm thinking of tackling 'RCU Callback Handling' and further digging into
the dyntick handling and then dig into other documents outside of
Data-Structure that need updates. But let me know any suggestions.
Thanks!
Joel Fernandes (Google) (5):
doc: rcu: Update information about resched_cpu
doc: rcu: Remove rcu_dynticks from Data-Structures
doc: rcu: Update Data-Structures for RCU flavor consolidation
doc: rcu: Clarify better the rcu_segcblist len field
doc: rcu: Update description of gp_seq fields in rcu_data
.../Data-Structures/BigTreeClassicRCUBH.svg | 499 -----------
.../BigTreeClassicRCUBHdyntick.svg | 695 ---------------
.../BigTreePreemptRCUBHdyntick.svg | 741 ----------------
.../BigTreePreemptRCUBHdyntickCB.svg | 834 +++++++-----------
.../Data-Structures/Data-Structures.html | 152 +---
.../RCU/Design/Data-Structures/blkd_task.svg | 676 +++++---------
.../Expedited-Grace-Periods.html | 6 +-
7 files changed, 596 insertions(+), 3007 deletions(-)
delete mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBH.svg
delete mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg
delete mode 100644 Documentation/RCU/Design/Data-Structures/BigTreePreemptRCUBHdyntick.svg
--
2.19.0.444.g18242da7ef-goog
^ permalink raw reply [flat|nested] 9+ messages in thread
* [1/5] doc: rcu: Update information about resched_cpu
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
@ 2018-09-25 18:25 ` Joel Fernandes (Google)
2018-09-25 18:25 ` [2/5] doc: rcu: Remove rcu_dynticks from Data-Structures Joel Fernandes (Google)
` (5 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: Joel Fernandes (Google) @ 2018-09-25 18:25 UTC (permalink / raw)
To: linux-kernel
Cc: Joel Fernandes (Google),
Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
Since commit fced9c8cfe6b ("rcu: Avoid resched_cpu() when rescheduling
the current CPU"), resched_cpu is not directly called from
sync_sched_exp_handler. Update the documentation about the same.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
.../Expedited-Grace-Periods/Expedited-Grace-Periods.html | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html b/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html
index e62c7c34a369..8e4f873b979f 100644
--- a/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html
+++ b/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html
@@ -160,9 +160,9 @@ was in flight.
If the CPU is idle, then <tt>sync_sched_exp_handler()</tt> reports
the quiescent state.
-<p>
-Otherwise, the handler invokes <tt>resched_cpu()</tt>, which forces
-a future context switch.
+<p> Otherwise, the handler forces a future context switch by setting the
+NEED_RESCHED flag of the current task's thread flag and the CPU preempt
+counter.
At the time of the context switch, the CPU reports the quiescent state.
Should the CPU go offline first, it will report the quiescent state
at that time.
--
2.19.0.444.g18242da7ef-goog
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [2/5] doc: rcu: Remove rcu_dynticks from Data-Structures
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
2018-09-25 18:25 ` [1/5] doc: rcu: Update information about resched_cpu Joel Fernandes (Google)
@ 2018-09-25 18:25 ` Joel Fernandes (Google)
2018-09-25 18:25 ` [3/5] doc: rcu: Update Data-Structures for RCU flavor consolidation Joel Fernandes (Google)
` (4 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: Joel Fernandes (Google) @ 2018-09-25 18:25 UTC (permalink / raw)
To: linux-kernel
Cc: Joel Fernandes (Google),
Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
rcu_dynticks was folded into rcu_data structure. Update the data
structures RCU document accordingly.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
.../BigTreeClassicRCUBHdyntick.svg | 695 ------------------
.../Data-Structures/Data-Structures.html | 92 +--
2 files changed, 25 insertions(+), 762 deletions(-)
delete mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg
diff --git a/Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg b/Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg
deleted file mode 100644
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diff --git a/Documentation/RCU/Design/Data-Structures/Data-Structures.html b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
index 476b1ac38e4c..f58cd3912918 100644
--- a/Documentation/RCU/Design/Data-Structures/Data-Structures.html
+++ b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
@@ -23,8 +23,6 @@ to each other.
The <tt>rcu_segcblist</tt> Structure</a>
<li> <a href="#The rcu_data Structure">
The <tt>rcu_data</tt> Structure</a>
-<li> <a href="#The rcu_dynticks Structure">
- The <tt>rcu_dynticks</tt> Structure</a>
<li> <a href="#The rcu_head Structure">
The <tt>rcu_head</tt> Structure</a>
<li> <a href="#RCU-Specific Fields in the task_struct Structure">
@@ -173,17 +171,9 @@ CPUs whose scheduling-clock interrupts have been turned off are
said to be in <i>dyntick-idle mode</i>.
RCU must handle dyntick-idle CPUs specially
because RCU would otherwise wake up each CPU on every grace period,
-which would defeat the whole purpose of <tt>CONFIG_NO_HZ_IDLE</tt>.
-RCU uses the <tt>rcu_dynticks</tt> structure to track
-which CPUs are in dyntick idle mode, as shown below:
-
-</p><p><img src="BigTreeClassicRCUBHdyntick.svg" alt="BigTreeClassicRCUBHdyntick.svg" width="33%">
-
-</p><p>However, if a CPU is in dyntick-idle mode, it is in that mode
-for all flavors of RCU.
-Therefore, a single <tt>rcu_dynticks</tt> structure is allocated per
-CPU, and all of a given CPU's <tt>rcu_data</tt> structures share
-that <tt>rcu_dynticks</tt>, as shown in the figure.
+which would defeat the whole purpose of <tt>CONFIG_NO_HZ_IDLE</tt>. RCU uses
+the dynticks related fields in the <tt>rcu_data</tt> structure to track which
+CPUs are in dyntick idle mode.
</p><p>Kernels built with <tt>CONFIG_PREEMPT_RCU</tt> support
rcu_preempt in addition to rcu_sched and rcu_bh, as shown below:
@@ -216,9 +206,6 @@ its own synchronization:
<li> Each <tt>rcu_node</tt> structure has a spinlock.
<li> The fields in <tt>rcu_data</tt> are private to the corresponding
CPU, although a few can be read and written by other CPUs.
-<li> Similarly, the fields in <tt>rcu_dynticks</tt> are private
- to the corresponding CPU, although a few can be read by
- other CPUs.
</ol>
<p>It is important to note that different data structures can have
@@ -274,11 +261,6 @@ follows:
access to this information from the corresponding CPU.
Finally, this structure records past dyntick-idle state
for the corresponding CPU and also tracks statistics.
-<li> <tt>rcu_dynticks</tt>:
- This per-CPU structure tracks the current dyntick-idle
- state for the corresponding CPU.
- Unlike the other three structures, the <tt>rcu_dynticks</tt>
- structure is not replicated per RCU flavor.
<li> <tt>rcu_head</tt>:
This structure represents RCU callbacks, and is the
only structure allocated and managed by RCU users.
@@ -289,8 +271,8 @@ follows:
<p>If all you wanted from this article was a general notion of how
RCU's data structures are related, you are done.
Otherwise, each of the following sections give more details on
-the <tt>rcu_state</tt>, <tt>rcu_node</tt>, <tt>rcu_data</tt>,
-and <tt>rcu_dynticks</tt> data structures.
+the <tt>rcu_state</tt>, <tt>rcu_node</tt> and <tt>rcu_data</tt> data
+structures.
<h3><a name="The rcu_state Structure">
The <tt>rcu_state</tt> Structure</a></h3>
@@ -1017,30 +999,18 @@ as follows:
<pre>
1 int cpu;
- 2 struct rcu_state *rsp;
- 3 struct rcu_node *mynode;
- 4 struct rcu_dynticks *dynticks;
- 5 unsigned long grpmask;
- 6 bool beenonline;
+ 2 struct rcu_node *mynode;
+ 3 unsigned long grpmask;
+ 4 bool beenonline;
</pre>
<p>The <tt>->cpu</tt> field contains the number of the
-corresponding CPU, the <tt>->rsp</tt> pointer references
-the corresponding <tt>rcu_state</tt> structure (and is most frequently
-used to locate the name of the corresponding flavor of RCU for tracing),
-and the <tt>->mynode</tt> field references the corresponding
-<tt>rcu_node</tt> structure.
+corresponding CPU and the <tt>->mynode</tt> field references the
+corresponding <tt>rcu_node</tt> structure.
The <tt>->mynode</tt> is used to propagate quiescent states
up the combining tree.
-<p>The <tt>->dynticks</tt> pointer references the
-<tt>rcu_dynticks</tt> structure corresponding to this
-CPU.
-Recall that a single per-CPU instance of the <tt>rcu_dynticks</tt>
-structure is shared among all flavors of RCU.
-These first four fields are constant and therefore require not
-synchronization.
-
-</p><p>The <tt>->grpmask</tt> field indicates the bit in
+These two fields are constant and therefore donot require synchronization.
+<p>The <tt>->grpmask</tt> field indicates the bit in
the <tt>->mynode->qsmask</tt> corresponding to this
<tt>rcu_data</tt> structure, and is also used when propagating
quiescent states.
@@ -1181,26 +1151,22 @@ Finally, the <tt>->dynticks_fqs</tt> field is used to
count the number of times this CPU is determined to be in
dyntick-idle state, and is used for tracing and debugging purposes.
-<h3><a name="The rcu_dynticks Structure">
-The <tt>rcu_dynticks</tt> Structure</a></h3>
-
-<p>The <tt>rcu_dynticks</tt> maintains the per-CPU dyntick-idle state
-for the corresponding CPU.
-Unlike the other structures, <tt>rcu_dynticks</tt> is not
-replicated over the different flavors of RCU.
-The fields in this structure may be accessed only from the corresponding
-CPU (and from tracing) unless otherwise stated.
-Its fields are as follows:
+<p>
+This portion of the rcu_data structure is declared as follows:
<pre>
1 long dynticks_nesting;
2 long dynticks_nmi_nesting;
3 atomic_t dynticks;
4 bool rcu_need_heavy_qs;
- 5 unsigned long rcu_qs_ctr;
- 6 bool rcu_urgent_qs;
+ 5 bool rcu_urgent_qs;
</pre>
+<p>These fields in the rcu_data structure maintain the per-CPU dyntick-idle
+state for the corresponding CPU.
+The fields may be accessed only from the corresponding CPU (and from tracing)
+unless otherwise stated.
+
<p>The <tt>->dynticks_nesting</tt> field counts the
nesting depth of process execution, so that in normal circumstances
this counter has value zero or one.
@@ -1242,19 +1208,11 @@ it is willing to call for heavy-weight dyntick-counter operations.
This flag is checked by RCU's context-switch and <tt>cond_resched()</tt>
code, which provide a momentary idle sojourn in response.
-</p><p>The <tt>->rcu_qs_ctr</tt> field is used to record
-quiescent states from <tt>cond_resched()</tt>.
-Because <tt>cond_resched()</tt> can execute quite frequently, this
-must be quite lightweight, as in a non-atomic increment of this
-per-CPU field.
-
</p><p>Finally, the <tt>->rcu_urgent_qs</tt> field is used to record
-the fact that the RCU core code would really like to see a quiescent
-state from the corresponding CPU, with the various other fields indicating
-just how badly RCU wants this quiescent state.
-This flag is checked by RCU's context-switch and <tt>cond_resched()</tt>
-code, which, if nothing else, non-atomically increment <tt>->rcu_qs_ctr</tt>
-in response.
+the fact that the RCU core code would really like to see a quiescent state from
+the corresponding CPU, with the various other fields indicating just how badly
+RCU wants this quiescent state. This flag is checked by RCU's context-switch path
+(<tt>rcu_note_context_switch</tt>) and the cond_resched code.
<table>
<tr><th> </th></tr>
@@ -1431,7 +1389,7 @@ So each flavor of RCU is represented by an <tt>rcu_state</tt> structure,
which contains a combining tree of <tt>rcu_node</tt> and
<tt>rcu_data</tt> structures.
Finally, in <tt>CONFIG_NO_HZ_IDLE</tt> kernels, each CPU's dyntick-idle
-state is tracked by an <tt>rcu_dynticks</tt> structure.
+state is tracked by dynticks-related fields in the <tt>rcu_data</tt> structure.
If you made it this far, you are well prepared to read the code
walkthroughs in the other articles in this series.
--
2.19.0.444.g18242da7ef-goog
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [3/5] doc: rcu: Update Data-Structures for RCU flavor consolidation
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
2018-09-25 18:25 ` [1/5] doc: rcu: Update information about resched_cpu Joel Fernandes (Google)
2018-09-25 18:25 ` [2/5] doc: rcu: Remove rcu_dynticks from Data-Structures Joel Fernandes (Google)
@ 2018-09-25 18:25 ` Joel Fernandes (Google)
2018-09-25 18:26 ` [4/5] doc: rcu: Clarify better the rcu_segcblist len field Joel Fernandes (Google)
` (3 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: Joel Fernandes (Google) @ 2018-09-25 18:25 UTC (permalink / raw)
To: linux-kernel
Cc: Joel Fernandes (Google),
Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
This patch updates all Data-Structures document figures and text and
removes some unwanted figures, to reflect the recent work Paul has been
doing with consolidating all flavors of RCU.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
.../Data-Structures/BigTreeClassicRCUBH.svg | 499 -----------
.../BigTreePreemptRCUBHdyntick.svg | 741 ----------------
.../BigTreePreemptRCUBHdyntickCB.svg | 834 +++++++-----------
.../Data-Structures/Data-Structures.html | 49 +-
.../RCU/Design/Data-Structures/blkd_task.svg | 676 +++++---------
5 files changed, 559 insertions(+), 2240 deletions(-)
delete mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBH.svg
delete mode 100644 Documentation/RCU/Design/Data-Structures/BigTreePreemptRCUBHdyntick.svg
diff --git a/Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBH.svg b/Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBH.svg
deleted file mode 100644
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diff --git a/Documentation/RCU/Design/Data-Structures/Data-Structures.html b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
index f58cd3912918..3f9a8ae4287e 100644
--- a/Documentation/RCU/Design/Data-Structures/Data-Structures.html
+++ b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
@@ -154,36 +154,9 @@ on that root <tt>rcu_node</tt> structure remains acceptably low.
keeping lock contention under control at all tree levels regardless
of the level of loading on the system.
-</p><p>The Linux kernel actually supports multiple flavors of RCU
-running concurrently, so RCU builds separate data structures for each
-flavor.
-For example, for <tt>CONFIG_TREE_RCU=y</tt> kernels, RCU provides
-rcu_sched and rcu_bh, as shown below:
-
-</p><p><img src="BigTreeClassicRCUBH.svg" alt="BigTreeClassicRCUBH.svg" width="33%">
-
-</p><p>Energy efficiency is increasingly important, and for that
-reason the Linux kernel provides <tt>CONFIG_NO_HZ_IDLE</tt>, which
-turns off the scheduling-clock interrupts on idle CPUs, which in
-turn allows those CPUs to attain deeper sleep states and to consume
-less energy.
-CPUs whose scheduling-clock interrupts have been turned off are
-said to be in <i>dyntick-idle mode</i>.
-RCU must handle dyntick-idle CPUs specially
-because RCU would otherwise wake up each CPU on every grace period,
-which would defeat the whole purpose of <tt>CONFIG_NO_HZ_IDLE</tt>. RCU uses
-the dynticks related fields in the <tt>rcu_data</tt> structure to track which
-CPUs are in dyntick idle mode.
-
-</p><p>Kernels built with <tt>CONFIG_PREEMPT_RCU</tt> support
-rcu_preempt in addition to rcu_sched and rcu_bh, as shown below:
-
-</p><p><img src="BigTreePreemptRCUBHdyntick.svg" alt="BigTreePreemptRCUBHdyntick.svg" width="35%">
-
</p><p>RCU updaters wait for normal grace periods by registering
RCU callbacks, either directly via <tt>call_rcu()</tt> and
friends (namely <tt>call_rcu_bh()</tt> and <tt>call_rcu_sched()</tt>),
-there being a separate interface per flavor of RCU)
or indirectly via <tt>synchronize_rcu()</tt> and friends.
RCU callbacks are represented by <tt>rcu_head</tt> structures,
which are queued on <tt>rcu_data</tt> structures while they are
@@ -278,7 +251,7 @@ structures.
The <tt>rcu_state</tt> Structure</a></h3>
<p>The <tt>rcu_state</tt> structure is the base structure that
-represents a flavor of RCU.
+represents the state of RCU in the system.
This structure forms the interconnection between the
<tt>rcu_node</tt> and <tt>rcu_data</tt> structures,
tracks grace periods, contains the lock used to
@@ -373,7 +346,7 @@ sequence number.
The bottom two bits are the state of the current grace period,
which can be zero for not yet started or one for in progress.
In other words, if the bottom two bits of <tt>->gp_seq</tt> are
-zero, the corresponding flavor of RCU is idle.
+zero, then RCU is idle.
Any other value in the bottom two bits indicates that something is broken.
This field is protected by the root <tt>rcu_node</tt> structure's
<tt>->lock</tt> field.
@@ -403,10 +376,10 @@ as follows:
grace period in jiffies.
It is protected by the root <tt>rcu_node</tt>'s <tt>->lock</tt>.
-<p>The <tt>->name</tt> field points to the name of the RCU flavor
-(for example, “rcu_sched”), and is constant.
-The <tt>->abbr</tt> field contains a one-character abbreviation,
-for example, “s” for RCU-sched.
+<p>The <tt>->name</tt> and <tt>->abbr</tt> fields are legacy and used to
+refer to a particular flavor of RCU. These fields were used for naming RCU
+threads based on their RCU flavor and for tracing purposes. Since there is only
+a single instance of <tt>rcu_state</tt> now, these fields could be removed.
<h3><a name="The rcu_node Structure">
The <tt>rcu_node</tt> Structure</a></h3>
@@ -972,8 +945,7 @@ of <tt>rcu_barrier()</tt>.
<h3><a name="The rcu_data Structure">
The <tt>rcu_data</tt> Structure</a></h3>
-<p>The <tt>rcu_data</tt> maintains the per-CPU state for the
-corresponding flavor of RCU.
+<p>The <tt>rcu_data</tt> maintains the per-CPU state for the RCU subsystem.
The fields in this structure may be accessed only from the corresponding
CPU (and from tracing) unless otherwise stated.
This structure is the
@@ -1029,7 +1001,6 @@ as follows:
3 bool cpu_no_qs;
4 bool core_needs_qs;
5 bool gpwrap;
- 6 unsigned long rcu_qs_ctr_snap;
</pre>
<p>The <tt>->gp_seq</tt> and <tt>->gp_seq_needed</tt>
@@ -1075,10 +1046,6 @@ CPU has remained idle for so long that the
<tt>gp_seq</tt> counter is in danger of overflow, which
will cause the CPU to disregard the values of its counters on
its next exit from idle.
-Finally, the <tt>rcu_qs_ctr_snap</tt> field is used to detect
-cases where a given operation has resulted in a quiescent state
-for all flavors of RCU, for example, <tt>cond_resched()</tt>
-when RCU has indicated a need for quiescent states.
<h5>RCU Callback Handling</h5>
@@ -1385,7 +1352,7 @@ the last part of the array, thus traversing only the leaf
<h3><a name="Summary">
Summary</a></h3>
-So each flavor of RCU is represented by an <tt>rcu_state</tt> structure,
+So the state of RCU is represented by an <tt>rcu_state</tt> structure,
which contains a combining tree of <tt>rcu_node</tt> and
<tt>rcu_data</tt> structures.
Finally, in <tt>CONFIG_NO_HZ_IDLE</tt> kernels, each CPU's dyntick-idle
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2.19.0.444.g18242da7ef-goog
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [4/5] doc: rcu: Clarify better the rcu_segcblist len field
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
` (2 preceding siblings ...)
2018-09-25 18:25 ` [3/5] doc: rcu: Update Data-Structures for RCU flavor consolidation Joel Fernandes (Google)
@ 2018-09-25 18:26 ` Joel Fernandes (Google)
2018-09-25 18:26 ` [5/5] doc: rcu: Update description of gp_seq fields in rcu_data Joel Fernandes (Google)
` (2 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: Joel Fernandes (Google) @ 2018-09-25 18:26 UTC (permalink / raw)
To: linux-kernel
Cc: Joel Fernandes (Google),
Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
An important note under the rcu_segcblist description could use a
more detailed description. Especially explanation of the scenario
where the ->head field may be temporarily NULL making it not wise to
rely on it to determine if callbacks are associated with the
rcu_segcblist. Thanks Paul for clarifying over email.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
.../RCU/Design/Data-Structures/Data-Structures.html | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/Documentation/RCU/Design/Data-Structures/Data-Structures.html b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
index 3f9a8ae4287e..a45fc326d990 100644
--- a/Documentation/RCU/Design/Data-Structures/Data-Structures.html
+++ b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
@@ -928,10 +928,16 @@ this <tt>rcu_segcblist</tt> structure, <i>not</i> the <tt>->head</tt>
pointer.
The reason for this is that all the ready-to-invoke callbacks
(that is, those in the <tt>RCU_DONE_TAIL</tt> segment) are extracted
-all at once at callback-invocation time.
+all at once at callback-invocation time (<tt>rcu_do_batch</tt>), due
+to which <tt>->head</tt> may be set to NULL if there are no more
+callbacks on the <tt>rcu_segcblist</tt>.
If callback invocation must be postponed, for example, because a
high-priority process just woke up on this CPU, then the remaining
-callbacks are placed back on the <tt>RCU_DONE_TAIL</tt> segment.
+callbacks are placed back on the <tt>RCU_DONE_TAIL</tt> segment and
+<tt>->head</tt> would point to the start of the segment. So as you
+can see, the head field is briefly NULL even though not all callbacks
+could be invoked, so we can't rely on it to tell us if there are no
+callbacks associated with the <tt>rcu_segcb_list</tt>.
Either way, the <tt>->len</tt> and <tt>->len_lazy</tt> counts
are adjusted after the corresponding callbacks have been invoked, and so
again it is the <tt>->len</tt> count that accurately reflects whether
--
2.19.0.444.g18242da7ef-goog
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [5/5] doc: rcu: Update description of gp_seq fields in rcu_data
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
` (3 preceding siblings ...)
2018-09-25 18:26 ` [4/5] doc: rcu: Clarify better the rcu_segcblist len field Joel Fernandes (Google)
@ 2018-09-25 18:26 ` Joel Fernandes (Google)
2018-09-25 18:48 ` [0/5] rcu doc updates Joel Fernandes
2018-09-25 18:49 ` Joel Fernandes
6 siblings, 0 replies; 9+ messages in thread
From: Joel Fernandes (Google) @ 2018-09-25 18:26 UTC (permalink / raw)
To: linux-kernel
Cc: Joel Fernandes (Google),
Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
The rcu_state structure doesn't have a gp_seq_needed field. Update the
description under rcu_data accordingly, to reflect this.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
.../RCU/Design/Data-Structures/Data-Structures.html | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/Documentation/RCU/Design/Data-Structures/Data-Structures.html b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
index a45fc326d990..b41deca48383 100644
--- a/Documentation/RCU/Design/Data-Structures/Data-Structures.html
+++ b/Documentation/RCU/Design/Data-Structures/Data-Structures.html
@@ -1009,9 +1009,10 @@ as follows:
5 bool gpwrap;
</pre>
-<p>The <tt>->gp_seq</tt> and <tt>->gp_seq_needed</tt>
-fields are the counterparts of the fields of the same name
-in the <tt>rcu_state</tt> and <tt>rcu_node</tt> structures.
+<p>The <tt>->gp_seq</tt> field is the counterpart of the field of the same
+name in the <tt>rcu_state</tt> and <tt>rcu_node</tt> structures. The
+<tt>->gp_seq_needed</tt> field is the counterpart of the field of the same
+name in the rcu_node</tt> structure.
They may each lag up to one behind their <tt>rcu_node</tt>
counterparts, but in <tt>CONFIG_NO_HZ_IDLE</tt> and
<tt>CONFIG_NO_HZ_FULL</tt> kernels can lag
--
2.19.0.444.g18242da7ef-goog
^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [0/5] rcu doc updates
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
` (4 preceding siblings ...)
2018-09-25 18:26 ` [5/5] doc: rcu: Update description of gp_seq fields in rcu_data Joel Fernandes (Google)
@ 2018-09-25 18:48 ` Joel Fernandes
2018-09-25 18:49 ` Joel Fernandes
6 siblings, 0 replies; 9+ messages in thread
From: Joel Fernandes @ 2018-09-25 18:48 UTC (permalink / raw)
To: LKML
On Tue, Sep 25, 2018 at 11:26 AM Joel Fernandes (Google)
<joel@joelfernandes.org> wrote:
>
> Hi Paul,
> These patches are documentation updates for the rcu_dynticks rolling into
> rcu_data and also the updates to the fact that there's a single rcu_state now.
> Its based on your rcu/dev branch.
>
> Next I'm thinking of tackling 'RCU Callback Handling' and further digging into
> the dyntick handling and then dig into other documents outside of
> Data-Structure that need updates. But let me know any suggestions.
> Thanks!
Apologies that my scripts missed the 'PATCH' prefix. Hopefully that's
Ok for this time, but let me know if you'd like me to resend them!
Thanks!
- Joel
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [0/5] rcu doc updates
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
` (5 preceding siblings ...)
2018-09-25 18:48 ` [0/5] rcu doc updates Joel Fernandes
@ 2018-09-25 18:49 ` Joel Fernandes
2018-09-26 23:47 ` Paul E. McKenney
6 siblings, 1 reply; 9+ messages in thread
From: Joel Fernandes @ 2018-09-25 18:49 UTC (permalink / raw)
To: LKML
Cc: Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Paul E. McKenney, Steven Rostedt
On Tue, Sep 25, 2018 at 11:26 AM Joel Fernandes (Google)
<joel@joelfernandes.org> wrote:
>
> Hi Paul,
> These patches are documentation updates for the rcu_dynticks rolling into
> rcu_data and also the updates to the fact that there's a single rcu_state now.
> Its based on your rcu/dev branch.
>
> Next I'm thinking of tackling 'RCU Callback Handling' and further digging into
> the dyntick handling and then dig into other documents outside of
> Data-Structure that need updates. But let me know any suggestions.
> Thanks!
Apologies that my scripts missed the 'PATCH' prefix. Hopefully that's
Ok for this time, but let me know if you'd like me to resend them!
Thanks!
- Joel
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [0/5] rcu doc updates
2018-09-25 18:49 ` Joel Fernandes
@ 2018-09-26 23:47 ` Paul E. McKenney
0 siblings, 0 replies; 9+ messages in thread
From: Paul E. McKenney @ 2018-09-26 23:47 UTC (permalink / raw)
To: Joel Fernandes
Cc: LKML, Jonathan Corbet, Josh Triplett, Lai Jiangshan, linux-doc,
Mathieu Desnoyers, Steven Rostedt
On Tue, Sep 25, 2018 at 11:49:10AM -0700, Joel Fernandes wrote:
> On Tue, Sep 25, 2018 at 11:26 AM Joel Fernandes (Google)
> <joel@joelfernandes.org> wrote:
> >
> > Hi Paul,
> > These patches are documentation updates for the rcu_dynticks rolling into
> > rcu_data and also the updates to the fact that there's a single rcu_state now.
> > Its based on your rcu/dev branch.
> >
> > Next I'm thinking of tackling 'RCU Callback Handling' and further digging into
> > the dyntick handling and then dig into other documents outside of
> > Data-Structure that need updates. But let me know any suggestions.
> > Thanks!
>
> Apologies that my scripts missed the 'PATCH' prefix. Hopefully that's
> Ok for this time, but let me know if you'd like me to resend them!
> Thanks!
I will let it go this time. ;-)
Queued, thank you very much! I will push them out when I get to a
reliable network connection.
I made a few adjustments to wording, so please double-check. You
should be able to just diff against your original patches.
Thanx, Paul
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2018-09-27 4:28 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-09-25 18:25 [0/5] rcu doc updates Joel Fernandes (Google)
2018-09-25 18:25 ` [1/5] doc: rcu: Update information about resched_cpu Joel Fernandes (Google)
2018-09-25 18:25 ` [2/5] doc: rcu: Remove rcu_dynticks from Data-Structures Joel Fernandes (Google)
2018-09-25 18:25 ` [3/5] doc: rcu: Update Data-Structures for RCU flavor consolidation Joel Fernandes (Google)
2018-09-25 18:26 ` [4/5] doc: rcu: Clarify better the rcu_segcblist len field Joel Fernandes (Google)
2018-09-25 18:26 ` [5/5] doc: rcu: Update description of gp_seq fields in rcu_data Joel Fernandes (Google)
2018-09-25 18:48 ` [0/5] rcu doc updates Joel Fernandes
2018-09-25 18:49 ` Joel Fernandes
2018-09-26 23:47 ` Paul E. McKenney
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