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-rw-r--r--Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBH.svg499
-rw-r--r--Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg695
-rw-r--r--Documentation/RCU/Design/Data-Structures/BigTreePreemptRCUBHdyntick.svg741
-rw-r--r--Documentation/RCU/Design/Data-Structures/BigTreePreemptRCUBHdyntickCB.svg834
-rw-r--r--Documentation/RCU/Design/Data-Structures/Data-Structures.html173
-rw-r--r--Documentation/RCU/Design/Data-Structures/blkd_task.svg676
-rw-r--r--Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html6
-rw-r--r--Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html2
-rw-r--r--Documentation/RCU/Design/Requirements/Requirements.html206
9 files changed, 748 insertions, 3084 deletions
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deleted file mode 100644
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diff --git a/Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg b/Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg
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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 1d2051c0c3fc..18f179807563 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.
23 The <tt>rcu_segcblist</tt> Structure</a> 23 The <tt>rcu_segcblist</tt> Structure</a>
24<li> <a href="#The rcu_data Structure"> 24<li> <a href="#The rcu_data Structure">
25 The <tt>rcu_data</tt> Structure</a> 25 The <tt>rcu_data</tt> Structure</a>
26<li> <a href="#The rcu_dynticks Structure">
27 The <tt>rcu_dynticks</tt> Structure</a>
28<li> <a href="#The rcu_head Structure"> 26<li> <a href="#The rcu_head Structure">
29 The <tt>rcu_head</tt> Structure</a> 27 The <tt>rcu_head</tt> Structure</a>
30<li> <a href="#RCU-Specific Fields in the task_struct Structure"> 28<li> <a href="#RCU-Specific Fields in the task_struct Structure">
@@ -127,9 +125,11 @@ CPUs, RCU would configure the <tt>rcu_node</tt> tree as follows:
127</p><p>RCU currently permits up to a four-level tree, which on a 64-bit system 125</p><p>RCU currently permits up to a four-level tree, which on a 64-bit system
128accommodates up to 4,194,304 CPUs, though only a mere 524,288 CPUs for 126accommodates up to 4,194,304 CPUs, though only a mere 524,288 CPUs for
12932-bit systems. 12732-bit systems.
130On the other hand, you can set <tt>CONFIG_RCU_FANOUT</tt> to be 128On the other hand, you can set both <tt>CONFIG_RCU_FANOUT</tt> and
131as small as 2 if you wish, which would permit only 16 CPUs, which 129<tt>CONFIG_RCU_FANOUT_LEAF</tt> to be as small as 2, which would result
132is useful for testing. 130in a 16-CPU test using a 4-level tree.
131This can be useful for testing large-system capabilities on small test
132machines.
133 133
134</p><p>This multi-level combining tree allows us to get most of the 134</p><p>This multi-level combining tree allows us to get most of the
135performance and scalability 135performance and scalability
@@ -154,44 +154,9 @@ on that root <tt>rcu_node</tt> structure remains acceptably low.
154keeping lock contention under control at all tree levels regardless 154keeping lock contention under control at all tree levels regardless
155of the level of loading on the system. 155of the level of loading on the system.
156 156
157</p><p>The Linux kernel actually supports multiple flavors of RCU
158running concurrently, so RCU builds separate data structures for each
159flavor.
160For example, for <tt>CONFIG_TREE_RCU=y</tt> kernels, RCU provides
161rcu_sched and rcu_bh, as shown below:
162
163</p><p><img src="BigTreeClassicRCUBH.svg" alt="BigTreeClassicRCUBH.svg" width="33%">
164
165</p><p>Energy efficiency is increasingly important, and for that
166reason the Linux kernel provides <tt>CONFIG_NO_HZ_IDLE</tt>, which
167turns off the scheduling-clock interrupts on idle CPUs, which in
168turn allows those CPUs to attain deeper sleep states and to consume
169less energy.
170CPUs whose scheduling-clock interrupts have been turned off are
171said to be in <i>dyntick-idle mode</i>.
172RCU must handle dyntick-idle CPUs specially
173because RCU would otherwise wake up each CPU on every grace period,
174which would defeat the whole purpose of <tt>CONFIG_NO_HZ_IDLE</tt>.
175RCU uses the <tt>rcu_dynticks</tt> structure to track
176which CPUs are in dyntick idle mode, as shown below:
177
178</p><p><img src="BigTreeClassicRCUBHdyntick.svg" alt="BigTreeClassicRCUBHdyntick.svg" width="33%">
179
180</p><p>However, if a CPU is in dyntick-idle mode, it is in that mode
181for all flavors of RCU.
182Therefore, a single <tt>rcu_dynticks</tt> structure is allocated per
183CPU, and all of a given CPU's <tt>rcu_data</tt> structures share
184that <tt>rcu_dynticks</tt>, as shown in the figure.
185
186</p><p>Kernels built with <tt>CONFIG_PREEMPT_RCU</tt> support
187rcu_preempt in addition to rcu_sched and rcu_bh, as shown below:
188
189</p><p><img src="BigTreePreemptRCUBHdyntick.svg" alt="BigTreePreemptRCUBHdyntick.svg" width="35%">
190
191</p><p>RCU updaters wait for normal grace periods by registering 157</p><p>RCU updaters wait for normal grace periods by registering
192RCU callbacks, either directly via <tt>call_rcu()</tt> and 158RCU callbacks, either directly via <tt>call_rcu()</tt> and
193friends (namely <tt>call_rcu_bh()</tt> and <tt>call_rcu_sched()</tt>), 159friends (namely <tt>call_rcu_bh()</tt> and <tt>call_rcu_sched()</tt>),
194there being a separate interface per flavor of RCU)
195or indirectly via <tt>synchronize_rcu()</tt> and friends. 160or indirectly via <tt>synchronize_rcu()</tt> and friends.
196RCU callbacks are represented by <tt>rcu_head</tt> structures, 161RCU callbacks are represented by <tt>rcu_head</tt> structures,
197which are queued on <tt>rcu_data</tt> structures while they are 162which are queued on <tt>rcu_data</tt> structures while they are
@@ -214,9 +179,6 @@ its own synchronization:
214<li> Each <tt>rcu_node</tt> structure has a spinlock. 179<li> Each <tt>rcu_node</tt> structure has a spinlock.
215<li> The fields in <tt>rcu_data</tt> are private to the corresponding 180<li> The fields in <tt>rcu_data</tt> are private to the corresponding
216 CPU, although a few can be read and written by other CPUs. 181 CPU, although a few can be read and written by other CPUs.
217<li> Similarly, the fields in <tt>rcu_dynticks</tt> are private
218 to the corresponding CPU, although a few can be read by
219 other CPUs.
220</ol> 182</ol>
221 183
222<p>It is important to note that different data structures can have 184<p>It is important to note that different data structures can have
@@ -272,11 +234,6 @@ follows:
272 access to this information from the corresponding CPU. 234 access to this information from the corresponding CPU.
273 Finally, this structure records past dyntick-idle state 235 Finally, this structure records past dyntick-idle state
274 for the corresponding CPU and also tracks statistics. 236 for the corresponding CPU and also tracks statistics.
275<li> <tt>rcu_dynticks</tt>:
276 This per-CPU structure tracks the current dyntick-idle
277 state for the corresponding CPU.
278 Unlike the other three structures, the <tt>rcu_dynticks</tt>
279 structure is not replicated per RCU flavor.
280<li> <tt>rcu_head</tt>: 237<li> <tt>rcu_head</tt>:
281 This structure represents RCU callbacks, and is the 238 This structure represents RCU callbacks, and is the
282 only structure allocated and managed by RCU users. 239 only structure allocated and managed by RCU users.
@@ -287,14 +244,14 @@ follows:
287<p>If all you wanted from this article was a general notion of how 244<p>If all you wanted from this article was a general notion of how
288RCU's data structures are related, you are done. 245RCU's data structures are related, you are done.
289Otherwise, each of the following sections give more details on 246Otherwise, each of the following sections give more details on
290the <tt>rcu_state</tt>, <tt>rcu_node</tt>, <tt>rcu_data</tt>, 247the <tt>rcu_state</tt>, <tt>rcu_node</tt> and <tt>rcu_data</tt> data
291and <tt>rcu_dynticks</tt> data structures. 248structures.
292 249
293<h3><a name="The rcu_state Structure"> 250<h3><a name="The rcu_state Structure">
294The <tt>rcu_state</tt> Structure</a></h3> 251The <tt>rcu_state</tt> Structure</a></h3>
295 252
296<p>The <tt>rcu_state</tt> structure is the base structure that 253<p>The <tt>rcu_state</tt> structure is the base structure that
297represents a flavor of RCU. 254represents the state of RCU in the system.
298This structure forms the interconnection between the 255This structure forms the interconnection between the
299<tt>rcu_node</tt> and <tt>rcu_data</tt> structures, 256<tt>rcu_node</tt> and <tt>rcu_data</tt> structures,
300tracks grace periods, contains the lock used to 257tracks grace periods, contains the lock used to
@@ -389,7 +346,7 @@ sequence number.
389The bottom two bits are the state of the current grace period, 346The bottom two bits are the state of the current grace period,
390which can be zero for not yet started or one for in progress. 347which can be zero for not yet started or one for in progress.
391In other words, if the bottom two bits of <tt>-&gt;gp_seq</tt> are 348In other words, if the bottom two bits of <tt>-&gt;gp_seq</tt> are
392zero, the corresponding flavor of RCU is idle. 349zero, then RCU is idle.
393Any other value in the bottom two bits indicates that something is broken. 350Any other value in the bottom two bits indicates that something is broken.
394This field is protected by the root <tt>rcu_node</tt> structure's 351This field is protected by the root <tt>rcu_node</tt> structure's
395<tt>-&gt;lock</tt> field. 352<tt>-&gt;lock</tt> field.
@@ -419,10 +376,10 @@ as follows:
419grace period in jiffies. 376grace period in jiffies.
420It is protected by the root <tt>rcu_node</tt>'s <tt>-&gt;lock</tt>. 377It is protected by the root <tt>rcu_node</tt>'s <tt>-&gt;lock</tt>.
421 378
422<p>The <tt>-&gt;name</tt> field points to the name of the RCU flavor 379<p>The <tt>-&gt;name</tt> and <tt>-&gt;abbr</tt> fields distinguish
423(for example, &ldquo;rcu_sched&rdquo;), and is constant. 380between preemptible RCU (&ldquo;rcu_preempt&rdquo; and &ldquo;p&rdquo;)
424The <tt>-&gt;abbr</tt> field contains a one-character abbreviation, 381and non-preemptible RCU (&ldquo;rcu_sched&rdquo; and &ldquo;s&rdquo;).
425for example, &ldquo;s&rdquo; for RCU-sched. 382These fields are used for diagnostic and tracing purposes.
426 383
427<h3><a name="The rcu_node Structure"> 384<h3><a name="The rcu_node Structure">
428The <tt>rcu_node</tt> Structure</a></h3> 385The <tt>rcu_node</tt> Structure</a></h3>
@@ -971,25 +928,31 @@ this <tt>rcu_segcblist</tt> structure, <i>not</i> the <tt>-&gt;head</tt>
971pointer. 928pointer.
972The reason for this is that all the ready-to-invoke callbacks 929The reason for this is that all the ready-to-invoke callbacks
973(that is, those in the <tt>RCU_DONE_TAIL</tt> segment) are extracted 930(that is, those in the <tt>RCU_DONE_TAIL</tt> segment) are extracted
974all at once at callback-invocation time. 931all at once at callback-invocation time (<tt>rcu_do_batch</tt>), due
932to which <tt>-&gt;head</tt> may be set to NULL if there are no not-done
933callbacks remaining in the <tt>rcu_segcblist</tt>.
975If callback invocation must be postponed, for example, because a 934If callback invocation must be postponed, for example, because a
976high-priority process just woke up on this CPU, then the remaining 935high-priority process just woke up on this CPU, then the remaining
977callbacks are placed back on the <tt>RCU_DONE_TAIL</tt> segment. 936callbacks are placed back on the <tt>RCU_DONE_TAIL</tt> segment and
978Either way, the <tt>-&gt;len</tt> and <tt>-&gt;len_lazy</tt> counts 937<tt>-&gt;head</tt> once again points to the start of the segment.
979are adjusted after the corresponding callbacks have been invoked, and so 938In short, the head field can briefly be <tt>NULL</tt> even though the
980again it is the <tt>-&gt;len</tt> count that accurately reflects whether 939CPU has callbacks present the entire time.
981or not there are callbacks associated with this <tt>rcu_segcblist</tt> 940Therefore, it is not appropriate to test the <tt>-&gt;head</tt> pointer
982structure. 941for <tt>NULL</tt>.
942
943<p>In contrast, the <tt>-&gt;len</tt> and <tt>-&gt;len_lazy</tt> counts
944are adjusted only after the corresponding callbacks have been invoked.
945This means that the <tt>-&gt;len</tt> count is zero only if
946the <tt>rcu_segcblist</tt> structure really is devoid of callbacks.
983Of course, off-CPU sampling of the <tt>-&gt;len</tt> count requires 947Of course, off-CPU sampling of the <tt>-&gt;len</tt> count requires
984the use of appropriate synchronization, for example, memory barriers. 948careful use of appropriate synchronization, for example, memory barriers.
985This synchronization can be a bit subtle, particularly in the case 949This synchronization can be a bit subtle, particularly in the case
986of <tt>rcu_barrier()</tt>. 950of <tt>rcu_barrier()</tt>.
987 951
988<h3><a name="The rcu_data Structure"> 952<h3><a name="The rcu_data Structure">
989The <tt>rcu_data</tt> Structure</a></h3> 953The <tt>rcu_data</tt> Structure</a></h3>
990 954
991<p>The <tt>rcu_data</tt> maintains the per-CPU state for the 955<p>The <tt>rcu_data</tt> maintains the per-CPU state for the RCU subsystem.
992corresponding flavor of RCU.
993The fields in this structure may be accessed only from the corresponding 956The fields in this structure may be accessed only from the corresponding
994CPU (and from tracing) unless otherwise stated. 957CPU (and from tracing) unless otherwise stated.
995This structure is the 958This structure is the
@@ -1015,30 +978,19 @@ as follows:
1015 978
1016<pre> 979<pre>
1017 1 int cpu; 980 1 int cpu;
1018 2 struct rcu_state *rsp; 981 2 struct rcu_node *mynode;
1019 3 struct rcu_node *mynode; 982 3 unsigned long grpmask;
1020 4 struct rcu_dynticks *dynticks; 983 4 bool beenonline;
1021 5 unsigned long grpmask;
1022 6 bool beenonline;
1023</pre> 984</pre>
1024 985
1025<p>The <tt>-&gt;cpu</tt> field contains the number of the 986<p>The <tt>-&gt;cpu</tt> field contains the number of the
1026corresponding CPU, the <tt>-&gt;rsp</tt> pointer references 987corresponding CPU and the <tt>-&gt;mynode</tt> field references the
1027the corresponding <tt>rcu_state</tt> structure (and is most frequently 988corresponding <tt>rcu_node</tt> structure.
1028used to locate the name of the corresponding flavor of RCU for tracing),
1029and the <tt>-&gt;mynode</tt> field references the corresponding
1030<tt>rcu_node</tt> structure.
1031The <tt>-&gt;mynode</tt> is used to propagate quiescent states 989The <tt>-&gt;mynode</tt> is used to propagate quiescent states
1032up the combining tree. 990up the combining tree.
1033<p>The <tt>-&gt;dynticks</tt> pointer references the 991These two fields are constant and therefore do not require synchronization.
1034<tt>rcu_dynticks</tt> structure corresponding to this
1035CPU.
1036Recall that a single per-CPU instance of the <tt>rcu_dynticks</tt>
1037structure is shared among all flavors of RCU.
1038These first four fields are constant and therefore require not
1039synchronization.
1040 992
1041</p><p>The <tt>-&gt;grpmask</tt> field indicates the bit in 993<p>The <tt>-&gt;grpmask</tt> field indicates the bit in
1042the <tt>-&gt;mynode-&gt;qsmask</tt> corresponding to this 994the <tt>-&gt;mynode-&gt;qsmask</tt> corresponding to this
1043<tt>rcu_data</tt> structure, and is also used when propagating 995<tt>rcu_data</tt> structure, and is also used when propagating
1044quiescent states. 996quiescent states.
@@ -1057,12 +1009,12 @@ as follows:
1057 3 bool cpu_no_qs; 1009 3 bool cpu_no_qs;
1058 4 bool core_needs_qs; 1010 4 bool core_needs_qs;
1059 5 bool gpwrap; 1011 5 bool gpwrap;
1060 6 unsigned long rcu_qs_ctr_snap;
1061</pre> 1012</pre>
1062 1013
1063<p>The <tt>-&gt;gp_seq</tt> and <tt>-&gt;gp_seq_needed</tt> 1014<p>The <tt>-&gt;gp_seq</tt> field is the counterpart of the field of the same
1064fields are the counterparts of the fields of the same name 1015name in the <tt>rcu_state</tt> and <tt>rcu_node</tt> structures. The
1065in the <tt>rcu_state</tt> and <tt>rcu_node</tt> structures. 1016<tt>-&gt;gp_seq_needed</tt> field is the counterpart of the field of the same
1017name in the rcu_node</tt> structure.
1066They may each lag up to one behind their <tt>rcu_node</tt> 1018They may each lag up to one behind their <tt>rcu_node</tt>
1067counterparts, but in <tt>CONFIG_NO_HZ_IDLE</tt> and 1019counterparts, but in <tt>CONFIG_NO_HZ_IDLE</tt> and
1068<tt>CONFIG_NO_HZ_FULL</tt> kernels can lag 1020<tt>CONFIG_NO_HZ_FULL</tt> kernels can lag
@@ -1103,10 +1055,6 @@ CPU has remained idle for so long that the
1103<tt>gp_seq</tt> counter is in danger of overflow, which 1055<tt>gp_seq</tt> counter is in danger of overflow, which
1104will cause the CPU to disregard the values of its counters on 1056will cause the CPU to disregard the values of its counters on
1105its next exit from idle. 1057its next exit from idle.
1106Finally, the <tt>rcu_qs_ctr_snap</tt> field is used to detect
1107cases where a given operation has resulted in a quiescent state
1108for all flavors of RCU, for example, <tt>cond_resched()</tt>
1109when RCU has indicated a need for quiescent states.
1110 1058
1111<h5>RCU Callback Handling</h5> 1059<h5>RCU Callback Handling</h5>
1112 1060
@@ -1179,26 +1127,22 @@ Finally, the <tt>-&gt;dynticks_fqs</tt> field is used to
1179count the number of times this CPU is determined to be in 1127count the number of times this CPU is determined to be in
1180dyntick-idle state, and is used for tracing and debugging purposes. 1128dyntick-idle state, and is used for tracing and debugging purposes.
1181 1129
1182<h3><a name="The rcu_dynticks Structure"> 1130<p>
1183The <tt>rcu_dynticks</tt> Structure</a></h3> 1131This portion of the rcu_data structure is declared as follows:
1184
1185<p>The <tt>rcu_dynticks</tt> maintains the per-CPU dyntick-idle state
1186for the corresponding CPU.
1187Unlike the other structures, <tt>rcu_dynticks</tt> is not
1188replicated over the different flavors of RCU.
1189The fields in this structure may be accessed only from the corresponding
1190CPU (and from tracing) unless otherwise stated.
1191Its fields are as follows:
1192 1132
1193<pre> 1133<pre>
1194 1 long dynticks_nesting; 1134 1 long dynticks_nesting;
1195 2 long dynticks_nmi_nesting; 1135 2 long dynticks_nmi_nesting;
1196 3 atomic_t dynticks; 1136 3 atomic_t dynticks;
1197 4 bool rcu_need_heavy_qs; 1137 4 bool rcu_need_heavy_qs;
1198 5 unsigned long rcu_qs_ctr; 1138 5 bool rcu_urgent_qs;
1199 6 bool rcu_urgent_qs;
1200</pre> 1139</pre>
1201 1140
1141<p>These fields in the rcu_data structure maintain the per-CPU dyntick-idle
1142state for the corresponding CPU.
1143The fields may be accessed only from the corresponding CPU (and from tracing)
1144unless otherwise stated.
1145
1202<p>The <tt>-&gt;dynticks_nesting</tt> field counts the 1146<p>The <tt>-&gt;dynticks_nesting</tt> field counts the
1203nesting depth of process execution, so that in normal circumstances 1147nesting depth of process execution, so that in normal circumstances
1204this counter has value zero or one. 1148this counter has value zero or one.
@@ -1240,19 +1184,12 @@ it is willing to call for heavy-weight dyntick-counter operations.
1240This flag is checked by RCU's context-switch and <tt>cond_resched()</tt> 1184This flag is checked by RCU's context-switch and <tt>cond_resched()</tt>
1241code, which provide a momentary idle sojourn in response. 1185code, which provide a momentary idle sojourn in response.
1242 1186
1243</p><p>The <tt>-&gt;rcu_qs_ctr</tt> field is used to record
1244quiescent states from <tt>cond_resched()</tt>.
1245Because <tt>cond_resched()</tt> can execute quite frequently, this
1246must be quite lightweight, as in a non-atomic increment of this
1247per-CPU field.
1248
1249</p><p>Finally, the <tt>-&gt;rcu_urgent_qs</tt> field is used to record 1187</p><p>Finally, the <tt>-&gt;rcu_urgent_qs</tt> field is used to record
1250the fact that the RCU core code would really like to see a quiescent 1188the fact that the RCU core code would really like to see a quiescent state from
1251state from the corresponding CPU, with the various other fields indicating 1189the corresponding CPU, with the various other fields indicating just how badly
1252just how badly RCU wants this quiescent state. 1190RCU wants this quiescent state.
1253This flag is checked by RCU's context-switch and <tt>cond_resched()</tt> 1191This flag is checked by RCU's context-switch path
1254code, which, if nothing else, non-atomically increment <tt>-&gt;rcu_qs_ctr</tt> 1192(<tt>rcu_note_context_switch</tt>) and the cond_resched code.
1255in response.
1256 1193
1257<table> 1194<table>
1258<tr><th>&nbsp;</th></tr> 1195<tr><th>&nbsp;</th></tr>
@@ -1425,11 +1362,11 @@ the last part of the array, thus traversing only the leaf
1425<h3><a name="Summary"> 1362<h3><a name="Summary">
1426Summary</a></h3> 1363Summary</a></h3>
1427 1364
1428So each flavor of RCU is represented by an <tt>rcu_state</tt> structure, 1365So the state of RCU is represented by an <tt>rcu_state</tt> structure,
1429which contains a combining tree of <tt>rcu_node</tt> and 1366which contains a combining tree of <tt>rcu_node</tt> and
1430<tt>rcu_data</tt> structures. 1367<tt>rcu_data</tt> structures.
1431Finally, in <tt>CONFIG_NO_HZ_IDLE</tt> kernels, each CPU's dyntick-idle 1368Finally, in <tt>CONFIG_NO_HZ_IDLE</tt> kernels, each CPU's dyntick-idle
1432state is tracked by an <tt>rcu_dynticks</tt> structure. 1369state is tracked by dynticks-related fields in the <tt>rcu_data</tt> structure.
1433 1370
1434If you made it this far, you are well prepared to read the code 1371If you made it this far, you are well prepared to read the code
1435walkthroughs in the other articles in this series. 1372walkthroughs in the other articles in this series.
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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.
160If the CPU is idle, then <tt>sync_sched_exp_handler()</tt> reports 160If the CPU is idle, then <tt>sync_sched_exp_handler()</tt> reports
161the quiescent state. 161the quiescent state.
162 162
163<p> 163<p> Otherwise, the handler forces a future context switch by setting the
164Otherwise, the handler invokes <tt>resched_cpu()</tt>, which forces 164NEED_RESCHED flag of the current task's thread flag and the CPU preempt
165a future context switch. 165counter.
166At the time of the context switch, the CPU reports the quiescent state. 166At the time of the context switch, the CPU reports the quiescent state.
167Should the CPU go offline first, it will report the quiescent state 167Should the CPU go offline first, it will report the quiescent state
168at that time. 168at that time.
diff --git a/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html
index a346ce0116eb..e4d94fba6c89 100644
--- a/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html
+++ b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.html
@@ -77,7 +77,7 @@ The key point is that the lock-acquisition functions, including
77<tt>smp_mb__after_unlock_lock()</tt> immediately after successful 77<tt>smp_mb__after_unlock_lock()</tt> immediately after successful
78acquisition of the lock. 78acquisition of the lock.
79 79
80<p>Therefore, for any given <tt>rcu_node</tt> struction, any access 80<p>Therefore, for any given <tt>rcu_node</tt> structure, any access
81happening before one of the above lock-release functions will be seen 81happening before one of the above lock-release functions will be seen
82by all CPUs as happening before any access happening after a later 82by all CPUs as happening before any access happening after a later
83one of the above lock-acquisition functions. 83one of the above lock-acquisition functions.
diff --git a/Documentation/RCU/Design/Requirements/Requirements.html b/Documentation/RCU/Design/Requirements/Requirements.html
index 43c4e2f05f40..9fca73e03a98 100644
--- a/Documentation/RCU/Design/Requirements/Requirements.html
+++ b/Documentation/RCU/Design/Requirements/Requirements.html
@@ -900,8 +900,6 @@ Except where otherwise noted, these non-guarantees were premeditated.
900 Grace Periods Don't Partition Read-Side Critical Sections</a> 900 Grace Periods Don't Partition Read-Side Critical Sections</a>
901<li> <a href="#Read-Side Critical Sections Don't Partition Grace Periods"> 901<li> <a href="#Read-Side Critical Sections Don't Partition Grace Periods">
902 Read-Side Critical Sections Don't Partition Grace Periods</a> 902 Read-Side Critical Sections Don't Partition Grace Periods</a>
903<li> <a href="#Disabling Preemption Does Not Block Grace Periods">
904 Disabling Preemption Does Not Block Grace Periods</a>
905</ol> 903</ol>
906 904
907<h3><a name="Readers Impose Minimal Ordering">Readers Impose Minimal Ordering</a></h3> 905<h3><a name="Readers Impose Minimal Ordering">Readers Impose Minimal Ordering</a></h3>
@@ -1259,54 +1257,6 @@ of RCU grace periods.
1259<tr><td>&nbsp;</td></tr> 1257<tr><td>&nbsp;</td></tr>
1260</table> 1258</table>
1261 1259
1262<h3><a name="Disabling Preemption Does Not Block Grace Periods">
1263Disabling Preemption Does Not Block Grace Periods</a></h3>
1264
1265<p>
1266There was a time when disabling preemption on any given CPU would block
1267subsequent grace periods.
1268However, this was an accident of implementation and is not a requirement.
1269And in the current Linux-kernel implementation, disabling preemption
1270on a given CPU in fact does not block grace periods, as Oleg Nesterov
1271<a href="https://lkml.kernel.org/g/20150614193825.GA19582@redhat.com">demonstrated</a>.
1272
1273<p>
1274If you need a preempt-disable region to block grace periods, you need to add
1275<tt>rcu_read_lock()</tt> and <tt>rcu_read_unlock()</tt>, for example
1276as follows:
1277
1278<blockquote>
1279<pre>
1280 1 preempt_disable();
1281 2 rcu_read_lock();
1282 3 do_something();
1283 4 rcu_read_unlock();
1284 5 preempt_enable();
1285 6
1286 7 /* Spinlocks implicitly disable preemption. */
1287 8 spin_lock(&amp;mylock);
1288 9 rcu_read_lock();
128910 do_something();
129011 rcu_read_unlock();
129112 spin_unlock(&amp;mylock);
1292</pre>
1293</blockquote>
1294
1295<p>
1296In theory, you could enter the RCU read-side critical section first,
1297but it is more efficient to keep the entire RCU read-side critical
1298section contained in the preempt-disable region as shown above.
1299Of course, RCU read-side critical sections that extend outside of
1300preempt-disable regions will work correctly, but such critical sections
1301can be preempted, which forces <tt>rcu_read_unlock()</tt> to do
1302more work.
1303And no, this is <i>not</i> an invitation to enclose all of your RCU
1304read-side critical sections within preempt-disable regions, because
1305doing so would degrade real-time response.
1306
1307<p>
1308This non-requirement appeared with preemptible RCU.
1309
1310<h2><a name="Parallelism Facts of Life">Parallelism Facts of Life</a></h2> 1260<h2><a name="Parallelism Facts of Life">Parallelism Facts of Life</a></h2>
1311 1261
1312<p> 1262<p>
@@ -1381,6 +1331,7 @@ Classes of quality-of-implementation requirements are as follows:
1381<ol> 1331<ol>
1382<li> <a href="#Specialization">Specialization</a> 1332<li> <a href="#Specialization">Specialization</a>
1383<li> <a href="#Performance and Scalability">Performance and Scalability</a> 1333<li> <a href="#Performance and Scalability">Performance and Scalability</a>
1334<li> <a href="#Forward Progress">Forward Progress</a>
1384<li> <a href="#Composability">Composability</a> 1335<li> <a href="#Composability">Composability</a>
1385<li> <a href="#Corner Cases">Corner Cases</a> 1336<li> <a href="#Corner Cases">Corner Cases</a>
1386</ol> 1337</ol>
@@ -1645,7 +1596,7 @@ used in place of <tt>synchronize_rcu()</tt> as follows:
164516 struct foo *p; 159616 struct foo *p;
164617 159717
164718 spin_lock(&amp;gp_lock); 159818 spin_lock(&amp;gp_lock);
164819 p = rcu_dereference(gp); 159919 p = rcu_access_pointer(gp);
164920 if (!p) { 160020 if (!p) {
165021 spin_unlock(&amp;gp_lock); 160121 spin_unlock(&amp;gp_lock);
165122 return false; 160222 return false;
@@ -1822,6 +1773,106 @@ so it is too early to tell whether they will stand the test of time.
1822RCU thus provides a range of tools to allow updaters to strike the 1773RCU thus provides a range of tools to allow updaters to strike the
1823required tradeoff between latency, flexibility and CPU overhead. 1774required tradeoff between latency, flexibility and CPU overhead.
1824 1775
1776<h3><a name="Forward Progress">Forward Progress</a></h3>
1777
1778<p>
1779In theory, delaying grace-period completion and callback invocation
1780is harmless.
1781In practice, not only are memory sizes finite but also callbacks sometimes
1782do wakeups, and sufficiently deferred wakeups can be difficult
1783to distinguish from system hangs.
1784Therefore, RCU must provide a number of mechanisms to promote forward
1785progress.
1786
1787<p>
1788These mechanisms are not foolproof, nor can they be.
1789For one simple example, an infinite loop in an RCU read-side critical
1790section must by definition prevent later grace periods from ever completing.
1791For a more involved example, consider a 64-CPU system built with
1792<tt>CONFIG_RCU_NOCB_CPU=y</tt> and booted with <tt>rcu_nocbs=1-63</tt>,
1793where CPUs&nbsp;1 through&nbsp;63 spin in tight loops that invoke
1794<tt>call_rcu()</tt>.
1795Even if these tight loops also contain calls to <tt>cond_resched()</tt>
1796(thus allowing grace periods to complete), CPU&nbsp;0 simply will
1797not be able to invoke callbacks as fast as the other 63 CPUs can
1798register them, at least not until the system runs out of memory.
1799In both of these examples, the Spiderman principle applies: With great
1800power comes great responsibility.
1801However, short of this level of abuse, RCU is required to
1802ensure timely completion of grace periods and timely invocation of
1803callbacks.
1804
1805<p>
1806RCU takes the following steps to encourage timely completion of
1807grace periods:
1808
1809<ol>
1810<li> If a grace period fails to complete within 100&nbsp;milliseconds,
1811 RCU causes future invocations of <tt>cond_resched()</tt> on
1812 the holdout CPUs to provide an RCU quiescent state.
1813 RCU also causes those CPUs' <tt>need_resched()</tt> invocations
1814 to return <tt>true</tt>, but only after the corresponding CPU's
1815 next scheduling-clock.
1816<li> CPUs mentioned in the <tt>nohz_full</tt> kernel boot parameter
1817 can run indefinitely in the kernel without scheduling-clock
1818 interrupts, which defeats the above <tt>need_resched()</tt>
1819 strategem.
1820 RCU will therefore invoke <tt>resched_cpu()</tt> on any
1821 <tt>nohz_full</tt> CPUs still holding out after
1822 109&nbsp;milliseconds.
1823<li> In kernels built with <tt>CONFIG_RCU_BOOST=y</tt>, if a given
1824 task that has been preempted within an RCU read-side critical
1825 section is holding out for more than 500&nbsp;milliseconds,
1826 RCU will resort to priority boosting.
1827<li> If a CPU is still holding out 10&nbsp;seconds into the grace
1828 period, RCU will invoke <tt>resched_cpu()</tt> on it regardless
1829 of its <tt>nohz_full</tt> state.
1830</ol>
1831
1832<p>
1833The above values are defaults for systems running with <tt>HZ=1000</tt>.
1834They will vary as the value of <tt>HZ</tt> varies, and can also be
1835changed using the relevant Kconfig options and kernel boot parameters.
1836RCU currently does not do much sanity checking of these
1837parameters, so please use caution when changing them.
1838Note that these forward-progress measures are provided only for RCU,
1839not for
1840<a href="#Sleepable RCU">SRCU</a> or
1841<a href="#Tasks RCU">Tasks RCU</a>.
1842
1843<p>
1844RCU takes the following steps in <tt>call_rcu()</tt> to encourage timely
1845invocation of callbacks when any given non-<tt>rcu_nocbs</tt> CPU has
184610,000 callbacks, or has 10,000 more callbacks than it had the last time
1847encouragement was provided:
1848
1849<ol>
1850<li> Starts a grace period, if one is not already in progress.
1851<li> Forces immediate checking for quiescent states, rather than
1852 waiting for three milliseconds to have elapsed since the
1853 beginning of the grace period.
1854<li> Immediately tags the CPU's callbacks with their grace period
1855 completion numbers, rather than waiting for the <tt>RCU_SOFTIRQ</tt>
1856 handler to get around to it.
1857<li> Lifts callback-execution batch limits, which speeds up callback
1858 invocation at the expense of degrading realtime response.
1859</ol>
1860
1861<p>
1862Again, these are default values when running at <tt>HZ=1000</tt>,
1863and can be overridden.
1864Again, these forward-progress measures are provided only for RCU,
1865not for
1866<a href="#Sleepable RCU">SRCU</a> or
1867<a href="#Tasks RCU">Tasks RCU</a>.
1868Even for RCU, callback-invocation forward progress for <tt>rcu_nocbs</tt>
1869CPUs is much less well-developed, in part because workloads benefiting
1870from <tt>rcu_nocbs</tt> CPUs tend to invoke <tt>call_rcu()</tt>
1871relatively infrequently.
1872If workloads emerge that need both <tt>rcu_nocbs</tt> CPUs and high
1873<tt>call_rcu()</tt> invocation rates, then additional forward-progress
1874work will be required.
1875
1825<h3><a name="Composability">Composability</a></h3> 1876<h3><a name="Composability">Composability</a></h3>
1826 1877
1827<p> 1878<p>
@@ -2272,7 +2323,7 @@ that meets this requirement.
2272Furthermore, NMI handlers can be interrupted by what appear to RCU 2323Furthermore, NMI handlers can be interrupted by what appear to RCU
2273to be normal interrupts. 2324to be normal interrupts.
2274One way that this can happen is for code that directly invokes 2325One way that this can happen is for code that directly invokes
2275<tt>rcu_irq_enter()</tt> and </tt>rcu_irq_exit()</tt> to be called 2326<tt>rcu_irq_enter()</tt> and <tt>rcu_irq_exit()</tt> to be called
2276from an NMI handler. 2327from an NMI handler.
2277This astonishing fact of life prompted the current code structure, 2328This astonishing fact of life prompted the current code structure,
2278which has <tt>rcu_irq_enter()</tt> invoking <tt>rcu_nmi_enter()</tt> 2329which has <tt>rcu_irq_enter()</tt> invoking <tt>rcu_nmi_enter()</tt>
@@ -2294,7 +2345,7 @@ via <tt>del_timer_sync()</tt> or similar.
2294<p> 2345<p>
2295Unfortunately, there is no way to cancel an RCU callback; 2346Unfortunately, there is no way to cancel an RCU callback;
2296once you invoke <tt>call_rcu()</tt>, the callback function is 2347once you invoke <tt>call_rcu()</tt>, the callback function is
2297going to eventually be invoked, unless the system goes down first. 2348eventually going to be invoked, unless the system goes down first.
2298Because it is normally considered socially irresponsible to crash the system 2349Because it is normally considered socially irresponsible to crash the system
2299in response to a module unload request, we need some other way 2350in response to a module unload request, we need some other way
2300to deal with in-flight RCU callbacks. 2351to deal with in-flight RCU callbacks.
@@ -2424,23 +2475,37 @@ for context-switch-heavy <tt>CONFIG_NO_HZ_FULL=y</tt> workloads,
2424but there is room for further improvement. 2475but there is room for further improvement.
2425 2476
2426<p> 2477<p>
2427In the past, it was forbidden to disable interrupts across an 2478It is forbidden to hold any of scheduler's runqueue or priority-inheritance
2428<tt>rcu_read_unlock()</tt> unless that interrupt-disabled region 2479spinlocks across an <tt>rcu_read_unlock()</tt> unless interrupts have been
2429of code also included the matching <tt>rcu_read_lock()</tt>. 2480disabled across the entire RCU read-side critical section, that is,
2430Violating this restriction could result in deadlocks involving the 2481up to and including the matching <tt>rcu_read_lock()</tt>.
2431scheduler's runqueue and priority-inheritance spinlocks. 2482Violating this restriction can result in deadlocks involving these
2432This restriction was lifted when interrupt-disabled calls to 2483scheduler spinlocks.
2433<tt>rcu_read_unlock()</tt> started deferring the reporting of 2484There was hope that this restriction might be lifted when interrupt-disabled
2434the resulting RCU-preempt quiescent state until the end of that 2485calls to <tt>rcu_read_unlock()</tt> started deferring the reporting of
2486the resulting RCU-preempt quiescent state until the end of the corresponding
2435interrupts-disabled region. 2487interrupts-disabled region.
2436This deferred reporting means that the scheduler's runqueue and 2488Unfortunately, timely reporting of the corresponding quiescent state
2437priority-inheritance locks cannot be held while reporting an RCU-preempt 2489to expedited grace periods requires a call to <tt>raise_softirq()</tt>,
2438quiescent state, which lifts the earlier restriction, at least from 2490which can acquire these scheduler spinlocks.
2439a deadlock perspective. 2491In addition, real-time systems using RCU priority boosting
2440Unfortunately, real-time systems using RCU priority boosting may
2441need this restriction to remain in effect because deferred 2492need this restriction to remain in effect because deferred
2442quiescent-state reporting also defers deboosting, which in turn 2493quiescent-state reporting would also defer deboosting, which in turn
2443degrades real-time latencies. 2494would degrade real-time latencies.
2495
2496<p>
2497In theory, if a given RCU read-side critical section could be
2498guaranteed to be less than one second in duration, holding a scheduler
2499spinlock across that critical section's <tt>rcu_read_unlock()</tt>
2500would require only that preemption be disabled across the entire
2501RCU read-side critical section, not interrupts.
2502Unfortunately, given the possibility of vCPU preemption, long-running
2503interrupts, and so on, it is not possible in practice to guarantee
2504that a given RCU read-side critical section will complete in less than
2505one second.
2506Therefore, as noted above, if scheduler spinlocks are held across
2507a given call to <tt>rcu_read_unlock()</tt>, interrupts must be
2508disabled across the entire RCU read-side critical section.
2444 2509
2445<h3><a name="Tracing and RCU">Tracing and RCU</a></h3> 2510<h3><a name="Tracing and RCU">Tracing and RCU</a></h3>
2446 2511
@@ -3233,6 +3298,11 @@ For example, RCU callback overhead might be charged back to the
3233originating <tt>call_rcu()</tt> instance, though probably not 3298originating <tt>call_rcu()</tt> instance, though probably not
3234in production kernels. 3299in production kernels.
3235 3300
3301<p>
3302Additional work may be required to provide reasonable forward-progress
3303guarantees under heavy load for grace periods and for callback
3304invocation.
3305
3236<h2><a name="Summary">Summary</a></h2> 3306<h2><a name="Summary">Summary</a></h2>
3237 3307
3238<p> 3308<p>
generated by cgit v1.2.2 (git 2.25.0) at 2026-05-27 12:20:12 -0400