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Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull RCU updates from Ingo Molnar:
 "The RCU changes in this cycle are:

   - Dynticks updates, consolidating open-coded counter accesses into a
     well-defined API

   - SRCU updates: Simplify algorithm, add formal verification

   - Documentation updates

   - Miscellaneous fixes

   - Torture-test updates

  Most of the diffstat comes from the relatively large documentation
  update"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (42 commits)
  srcu: Reduce probability of SRCU ->unlock_count[] counter overflow
  rcutorture: Add CBMC-based formal verification for SRCU
  srcu: Force full grace-period ordering
  srcu: Implement more-efficient reader counts
  rcu: Adjust FQS offline checks for exact online-CPU detection
  rcu: Check cond_resched_rcu_qs() state less often to reduce GP overhead
  rcu: Abstract extended quiescent state determination
  rcu: Abstract dynticks extended quiescent state enter/exit operations
  rcu: Add lockdep checks to synchronous expedited primitives
  rcu: Eliminate unused expedited_normal counter
  llist: Clarify comments about when locking is needed
  rcu: Fix comment in rcu_organize_nocb_kthreads()
  rcu: Enable RCU tracepoints by default to aid in debugging
  rcu: Make rcu_cpu_starting() use its "cpu" argument
  rcu: Add comment headers to expedited-grace-period counter functions
  rcu: Don't wake rcuc/X kthreads on NOCB CPUs
  rcu: Re-enable TASKS_RCU for User Mode Linux
  rcu: Once again use NMI-based stack traces in stall warnings
  rcu: Remove short-term CPU kicking
  rcu: Add long-term CPU kicking
  ...
This commit is contained in:
Linus Torvalds
2017-02-20 11:21:17 -08:00
parent 575260e3f8 a8709fa4a0
commit f7458a5d63
88 changed files with 7148 additions and 298 deletions
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Documentation/RCU/Design/Data-Structures/Data-Structures.html
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<head><title>A Tour Through TREE_RCU's Data Structures [LWN.net]</title>
<meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<p>January 27, 2016</p>
<p>December 18, 2016</p>
<p>This article was contributed by Paul E.&nbsp;McKenney</p>
<h3>Introduction</h3>
@@ -31,9 +31,6 @@ to each other.
Accessor Functions</a>
</ol>
At the end we have the
<a href="#Answers to Quick Quizzes">answers to the quick quizzes</a>.
<h3><a name="Data-Structure Relationships">Data-Structure Relationships</a></h3>
<p>RCU is for all intents and purposes a large state machine, and its
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Documentation/RCU/Design/Requirements/Requirements.html
+6 -6
View File
@@ -1480,7 +1480,7 @@ speed-of-light delays if nothing else.
<p>
Furthermore, uncertainty about external state is inherent in many cases.
For example, a pair of veternarians might use heartbeat to determine
For example, a pair of veterinarians might use heartbeat to determine
whether or not a given cat was alive.
But how long should they wait after the last heartbeat to decide that
the cat is in fact dead?
@@ -1489,9 +1489,9 @@ mean that a relaxed cat would be considered to cycle between death
and life more than 100 times per minute.
Moreover, just as with human beings, a cat's heart might stop for
some period of time, so the exact wait period is a judgment call.
One of our pair of veternarians might wait 30 seconds before pronouncing
One of our pair of veterinarians might wait 30 seconds before pronouncing
the cat dead, while the other might insist on waiting a full minute.
The two veternarians would then disagree on the state of the cat during
The two veterinarians would then disagree on the state of the cat during
the final 30 seconds of the minute following the last heartbeat.
<p>
@@ -1945,7 +1945,7 @@ guard against mishaps and misuse:
<ol>
<li> It is all too easy to forget to use <tt>rcu_read_lock()</tt>
everywhere that it is needed, so kernels built with
<tt>CONFIG_PROVE_RCU=y</tt> will spat if
<tt>CONFIG_PROVE_RCU=y</tt> will splat if
<tt>rcu_dereference()</tt> is used outside of an
RCU read-side critical section.
Update-side code can use <tt>rcu_dereference_protected()</tt>,
@@ -2421,7 +2421,7 @@ However, there are some restrictions on the code placed within
<li> Blocking is prohibited.
In practice, this is not a serious restriction given that idle
tasks are prohibited from blocking to begin with.
<li> Although nesting <tt>RCU_NONIDLE()</tt> is permited, they cannot
<li> Although nesting <tt>RCU_NONIDLE()</tt> is permitted, they cannot
nest indefinitely deeply.
However, given that they can be nested on the order of a million
deep, even on 32-bit systems, this should not be a serious
@@ -2885,7 +2885,7 @@ APIs for defining and initializing <tt>srcu_struct</tt> structures.
<h3><a name="Tasks RCU">Tasks RCU</a></h3>
<p>
Some forms of tracing use &ldquo;tramopolines&rdquo; to handle the
Some forms of tracing use &ldquo;trampolines&rdquo; to handle the
binary rewriting required to install different types of probes.
It would be good to be able to free old trampolines, which sounds
like a job for some form of RCU.
Documentation/RCU/trace.txt
+1 -4
View File
@@ -237,7 +237,7 @@ o "ktl" is the low-order 16 bits (in hexadecimal) of the count of
The output of "cat rcu/rcu_preempt/rcuexp" looks as follows:
s=21872 wd1=0 wd2=0 wd3=5 n=0 enq=0 sc=21872
s=21872 wd1=0 wd2=0 wd3=5 enq=0 sc=21872
These fields are as follows:
@@ -249,9 +249,6 @@ o "wd1", "wd2", and "wd3" are the number of times that an attempt
completed an expedited grace period that satisfies the attempted
request. "Our work is done."
o "n" is number of times that a concurrent CPU-hotplug operation
forced a fallback to a normal grace period.
o "enq" is the number of quiescent states still outstanding.
o "sc" is the number of times that the attempt to start a
Documentation/admin-guide/kernel-parameters.txt
+7
View File
@@ -3269,6 +3269,13 @@
Lazy RCU callbacks are those which RCU can
prove do nothing more than free memory.
rcutree.rcu_kick_kthreads= [KNL]
Cause the grace-period kthread to get an extra
wake_up() if it sleeps three times longer than
it should at force-quiescent-state time.
This wake_up() will be accompanied by a
WARN_ONCE() splat and an ftrace_dump().
rcuperf.gp_exp= [KNL]
Measure performance of expedited synchronous
grace-period primitives.
Documentation/memory-barriers.txt
+38 -32
View File
@@ -640,6 +640,10 @@ See also the subsection on "Cache Coherency" for a more thorough example.
CONTROL DEPENDENCIES
--------------------
Control dependencies can be a bit tricky because current compilers do
not understand them. The purpose of this section is to help you prevent
the compiler's ignorance from breaking your code.
A load-load control dependency requires a full read memory barrier, not
simply a data dependency barrier to make it work correctly. Consider the
following bit of code:
@@ -667,14 +671,15 @@ for load-store control dependencies, as in the following example:
q = READ_ONCE(a);
if (q) {
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
}
Control dependencies pair normally with other types of barriers. That
said, please note that READ_ONCE() is not optional! Without the
READ_ONCE(), the compiler might combine the load from 'a' with other
loads from 'a', and the store to 'b' with other stores to 'b', with
possible highly counterintuitive effects on ordering.
Control dependencies pair normally with other types of barriers.
That said, please note that neither READ_ONCE() nor WRITE_ONCE()
are optional! Without the READ_ONCE(), the compiler might combine the
load from 'a' with other loads from 'a'. Without the WRITE_ONCE(),
the compiler might combine the store to 'b' with other stores to 'b'.
Either can result in highly counterintuitive effects on ordering.
Worse yet, if the compiler is able to prove (say) that the value of
variable 'a' is always non-zero, it would be well within its rights
@@ -682,7 +687,7 @@ to optimize the original example by eliminating the "if" statement
as follows:
q = a;
b = p; /* BUG: Compiler and CPU can both reorder!!! */
b = 1; /* BUG: Compiler and CPU can both reorder!!! */
So don't leave out the READ_ONCE().
@@ -692,11 +697,11 @@ branches of the "if" statement as follows:
q = READ_ONCE(a);
if (q) {
barrier();
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
do_something();
} else {
barrier();
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
do_something_else();
}
@@ -705,12 +710,12 @@ optimization levels:
q = READ_ONCE(a);
barrier();
WRITE_ONCE(b, p); /* BUG: No ordering vs. load from a!!! */
WRITE_ONCE(b, 1); /* BUG: No ordering vs. load from a!!! */
if (q) {
/* WRITE_ONCE(b, p); -- moved up, BUG!!! */
/* WRITE_ONCE(b, 1); -- moved up, BUG!!! */
do_something();
} else {
/* WRITE_ONCE(b, p); -- moved up, BUG!!! */
/* WRITE_ONCE(b, 1); -- moved up, BUG!!! */
do_something_else();
}
@@ -723,10 +728,10 @@ memory barriers, for example, smp_store_release():
q = READ_ONCE(a);
if (q) {
smp_store_release(&b, p);
smp_store_release(&b, 1);
do_something();
} else {
smp_store_release(&b, p);
smp_store_release(&b, 1);
do_something_else();
}
@@ -735,10 +740,10 @@ ordering is guaranteed only when the stores differ, for example:
q = READ_ONCE(a);
if (q) {
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
do_something();
} else {
WRITE_ONCE(b, r);
WRITE_ONCE(b, 2);
do_something_else();
}
@@ -751,10 +756,10 @@ the needed conditional. For example:
q = READ_ONCE(a);
if (q % MAX) {
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
do_something();
} else {
WRITE_ONCE(b, r);
WRITE_ONCE(b, 2);
do_something_else();
}
@@ -763,7 +768,7 @@ equal to zero, in which case the compiler is within its rights to
transform the above code into the following:
q = READ_ONCE(a);
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
do_something_else();
Given this transformation, the CPU is not required to respect the ordering
@@ -776,10 +781,10 @@ one, perhaps as follows:
q = READ_ONCE(a);
BUILD_BUG_ON(MAX <= 1); /* Order load from a with store to b. */
if (q % MAX) {
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
do_something();
} else {
WRITE_ONCE(b, r);
WRITE_ONCE(b, 2);
do_something_else();
}
@@ -812,30 +817,28 @@ not necessarily apply to code following the if-statement:
q = READ_ONCE(a);
if (q) {
WRITE_ONCE(b, p);
WRITE_ONCE(b, 1);
} else {
WRITE_ONCE(b, r);
WRITE_ONCE(b, 2);
}
WRITE_ONCE(c, 1); /* BUG: No ordering against the read from "a". */
WRITE_ONCE(c, 1); /* BUG: No ordering against the read from 'a'. */
It is tempting to argue that there in fact is ordering because the
compiler cannot reorder volatile accesses and also cannot reorder
the writes to "b" with the condition. Unfortunately for this line
of reasoning, the compiler might compile the two writes to "b" as
the writes to 'b' with the condition. Unfortunately for this line
of reasoning, the compiler might compile the two writes to 'b' as
conditional-move instructions, as in this fanciful pseudo-assembly
language:
ld r1,a
ld r2,p
ld r3,r
cmp r1,$0
cmov,ne r4,r2
cmov,eq r4,r3
cmov,ne r4,$1
cmov,eq r4,$2
st r4,b
st $1,c
A weakly ordered CPU would have no dependency of any sort between the load
from "a" and the store to "c". The control dependencies would extend
from 'a' and the store to 'c'. The control dependencies would extend
only to the pair of cmov instructions and the store depending on them.
In short, control dependencies apply only to the stores in the then-clause
and else-clause of the if-statement in question (including functions
@@ -843,7 +846,7 @@ invoked by those two clauses), not to code following that if-statement.
Finally, control dependencies do -not- provide transitivity. This is
demonstrated by two related examples, with the initial values of
x and y both being zero:
'x' and 'y' both being zero:
CPU 0 CPU 1
======================= =======================
@@ -915,6 +918,9 @@ In summary:
(*) Control dependencies do -not- provide transitivity. If you
need transitivity, use smp_mb().
(*) Compilers do not understand control dependencies. It is therefore
your job to ensure that they do not break your code.
SMP BARRIER PAIRING
-------------------
include/linux/llist.h
+19 -14
View File
@@ -3,28 +3,33 @@
/*
* Lock-less NULL terminated single linked list
*
* If there are multiple producers and multiple consumers, llist_add
* can be used in producers and llist_del_all can be used in
* consumers. They can work simultaneously without lock. But
* llist_del_first can not be used here. Because llist_del_first
* depends on list->first->next does not changed if list->first is not
* changed during its operation, but llist_del_first, llist_add,
* llist_add (or llist_del_all, llist_add, llist_add) sequence in
* another consumer may violate that.
* Cases where locking is not needed:
* If there are multiple producers and multiple consumers, llist_add can be
* used in producers and llist_del_all can be used in consumers simultaneously
* without locking. Also a single consumer can use llist_del_first while
* multiple producers simultaneously use llist_add, without any locking.
*
* If there are multiple producers and one consumer, llist_add can be
* used in producers and llist_del_all or llist_del_first can be used
* in the consumer.
* Cases where locking is needed:
* If we have multiple consumers with llist_del_first used in one consumer, and
* llist_del_first or llist_del_all used in other consumers, then a lock is
* needed. This is because llist_del_first depends on list->first->next not
* changing, but without lock protection, there's no way to be sure about that
* if a preemption happens in the middle of the delete operation and on being
* preempted back, the list->first is the same as before causing the cmpxchg in
* llist_del_first to succeed. For example, while a llist_del_first operation
* is in progress in one consumer, then a llist_del_first, llist_add,
* llist_add (or llist_del_all, llist_add, llist_add) sequence in another
* consumer may cause violations.
*
* This can be summarized as follow:
* This can be summarized as follows:
*
* | add | del_first | del_all
* add | - | - | -
* del_first | | L | L
* del_all | | | -
*
* Where "-" stands for no lock is needed, while "L" stands for lock
* is needed.
* Where, a particular row's operation can happen concurrently with a column's
* operation, with "-" being no lock needed, while "L" being lock is needed.
*
* The list entries deleted via llist_del_all can be traversed with
* traversing function such as llist_for_each etc. But the list
include/linux/rcupdate.h
+12
View File
@@ -1161,5 +1161,17 @@ do { \
ftrace_dump(oops_dump_mode); \
} while (0)
/*
* Place this after a lock-acquisition primitive to guarantee that
* an UNLOCK+LOCK pair acts as a full barrier. This guarantee applies
* if the UNLOCK and LOCK are executed by the same CPU or if the
* UNLOCK and LOCK operate on the same lock variable.
*/
#ifdef CONFIG_PPC
#define smp_mb__after_unlock_lock() smp_mb() /* Full ordering for lock. */
#else /* #ifdef CONFIG_PPC */
#define smp_mb__after_unlock_lock() do { } while (0)
#endif /* #else #ifdef CONFIG_PPC */
#endif /* __LINUX_RCUPDATE_H */
include/linux/rcutiny.h
+6
View File
@@ -27,6 +27,12 @@
#include <linux/cache.h>
struct rcu_dynticks;
static inline int rcu_dynticks_snap(struct rcu_dynticks *rdtp)
{
return 0;
}
static inline unsigned long get_state_synchronize_rcu(void)
{
return 0;

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