---

yaml
---
r: 212131
b: refs/heads/master
c: 8af3c15
h: refs/heads/master
i:
  212129: b6fdbd8
  212127: 97853a8
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b61f6a57f1919ef8dbd33f864df9b8b361c65b11
+refs/heads/master: 8af3c153baf95374eff20a37f00c59a295b52756

trunk/CREDITS

@@ -3554,12 +3554,12 @@ E: cvance@nai.com
 D: portions of the Linux Security Module (LSM) framework and security modules
 
 N: Petr Vandrovec
-E: petr@vandrovec.name
+E: vandrove@vc.cvut.cz
 D: Small contributions to ncpfs
 D: Matrox framebuffer driver
-S: 21513 Conradia Ct
-S: Cupertino, CA 95014
-S: USA
+S: Chudenicka 8
+S: 10200 Prague 10, Hostivar
+S: Czech Republic
 
 N: Thibaut Varene
 E: T-Bone@parisc-linux.org

trunk/Documentation/DocBook/device-drivers.tmpl

@@ -46,6 +46,7 @@
 
      <sect1><title>Atomic and pointer manipulation</title>
 !Iarch/x86/include/asm/atomic.h
+!Iarch/x86/include/asm/unaligned.h
      </sect1>
 
      <sect1><title>Delaying, scheduling, and timer routines</title>

trunk/Documentation/DocBook/kernel-api.tmpl

@@ -57,6 +57,7 @@
      </para>
 
      <sect1><title>String Conversions</title>
+!Ilib/vsprintf.c
 !Elib/vsprintf.c
      </sect1>
      <sect1><title>String Manipulation</title>

trunk/Documentation/DocBook/kernel-locking.tmpl

@@ -1645,9 +1645,7 @@ the amount of locking which needs to be done.
       all the readers who were traversing the list when we deleted the
       element are finished.  We use <function>call_rcu()</function> to
       register a callback which will actually destroy the object once
-      all pre-existing readers are finished.  Alternatively,
-      <function>synchronize_rcu()</function> may be used to block until
-      all pre-existing are finished.
+      the readers are finished.
     </para>
     <para>
       But how does Read Copy Update know when the readers are
@@ -1716,7 +1714,7 @@ the amount of locking which needs to be done.
 -        object_put(obj);
 +        list_del_rcu(&amp;obj-&gt;list);
          cache_num--;
-+        call_rcu(&amp;obj-&gt;rcu, cache_delete_rcu);
++        call_rcu(&amp;obj-&gt;rcu, cache_delete_rcu, obj);
  }
 
  /* Must be holding cache_lock */
@@ -1727,6 +1725,14 @@ the amount of locking which needs to be done.
          if (++cache_num > MAX_CACHE_SIZE) {
                  struct object *i, *outcast = NULL;
                  list_for_each_entry(i, &amp;cache, list) {
+@@ -85,6 +94,7 @@
+         obj-&gt;popularity = 0;
+         atomic_set(&amp;obj-&gt;refcnt, 1); /* The cache holds a reference */
+         spin_lock_init(&amp;obj-&gt;lock);
++        INIT_RCU_HEAD(&amp;obj-&gt;rcu);
+
+         spin_lock_irqsave(&amp;cache_lock, flags);
+         __cache_add(obj);
 @@ -104,12 +114,11 @@
  struct object *cache_find(int id)
  {
@@ -1955,12 +1961,6 @@ machines due to caching.
    </sect1>
   </chapter>
 
-  <chapter id="apiref">
-   <title>Mutex API reference</title>
-!Iinclude/linux/mutex.h
-!Ekernel/mutex.c
-  </chapter>
-
   <chapter id="references">
    <title>Further reading</title>
 

trunk/Documentation/RCU/checklist.txt

@@ -218,22 +218,13 @@ over a rather long period of time, but improvements are always welcome!
 	include:
 
 	a.	Keeping a count of the number of data-structure elements
-		used by the RCU-protected data structure, including
-		those waiting for a grace period to elapse.  Enforce a
-		limit on this number, stalling updates as needed to allow
-		previously deferred frees to complete.	Alternatively,
-		limit only the number awaiting deferred free rather than
-		the total number of elements.
-
-		One way to stall the updates is to acquire the update-side
-		mutex.	(Don't try this with a spinlock -- other CPUs
-		spinning on the lock could prevent the grace period
-		from ever ending.)  Another way to stall the updates
-		is for the updates to use a wrapper function around
-		the memory allocator, so that this wrapper function
-		simulates OOM when there is too much memory awaiting an
-		RCU grace period.  There are of course many other
-		variations on this theme.
+		used by the RCU-protected data structure, including those
+		waiting for a grace period to elapse.  Enforce a limit
+		on this number, stalling updates as needed to allow
+		previously deferred frees to complete.
+
+		Alternatively, limit only the number awaiting deferred
+		free rather than the total number of elements.
 
 	b.	Limiting update rate.  For example, if updates occur only
 		once per hour, then no explicit rate limiting is required,
@@ -374,26 +365,3 @@ over a rather long period of time, but improvements are always welcome!
 	and the compiler to freely reorder code into and out of RCU
 	read-side critical sections.  It is the responsibility of the
 	RCU update-side primitives to deal with this.
-
-17.	Use CONFIG_PROVE_RCU, CONFIG_DEBUG_OBJECTS_RCU_HEAD, and
-	the __rcu sparse checks to validate your RCU code.  These
-	can help find problems as follows:
-
-	CONFIG_PROVE_RCU: check that accesses to RCU-protected data
-		structures are carried out under the proper RCU
-		read-side critical section, while holding the right
-		combination of locks, or whatever other conditions
-		are appropriate.
-
-	CONFIG_DEBUG_OBJECTS_RCU_HEAD: check that you don't pass the
-		same object to call_rcu() (or friends) before an RCU
-		grace period has elapsed since the last time that you
-		passed that same object to call_rcu() (or friends).
-
-	__rcu sparse checks: tag the pointer to the RCU-protected data
-		structure with __rcu, and sparse will warn you if you
-		access that pointer without the services of one of the
-		variants of rcu_dereference().
-
-	These debugging aids can help you find problems that are
-	otherwise extremely difficult to spot.

trunk/Documentation/RCU/stallwarn.txt

@@ -80,24 +80,6 @@ o	A CPU looping with bottom halves disabled.  This condition can
 o	For !CONFIG_PREEMPT kernels, a CPU looping anywhere in the kernel
 	without invoking schedule().
 
-o	A CPU-bound real-time task in a CONFIG_PREEMPT kernel, which might
-	happen to preempt a low-priority task in the middle of an RCU
-	read-side critical section.   This is especially damaging if
-	that low-priority task is not permitted to run on any other CPU,
-	in which case the next RCU grace period can never complete, which
-	will eventually cause the system to run out of memory and hang.
-	While the system is in the process of running itself out of
-	memory, you might see stall-warning messages.
-
-o	A CPU-bound real-time task in a CONFIG_PREEMPT_RT kernel that
-	is running at a higher priority than the RCU softirq threads.
-	This will prevent RCU callbacks from ever being invoked,
-	and in a CONFIG_TREE_PREEMPT_RCU kernel will further prevent
-	RCU grace periods from ever completing.  Either way, the
-	system will eventually run out of memory and hang.  In the
-	CONFIG_TREE_PREEMPT_RCU case, you might see stall-warning
-	messages.
-
 o	A bug in the RCU implementation.
 
 o	A hardware failure.  This is quite unlikely, but has occurred

trunk/Documentation/RCU/trace.txt

@@ -125,17 +125,6 @@ o	"b" is the batch limit for this CPU.  If more than this number
 	of RCU callbacks is ready to invoke, then the remainder will
 	be deferred.
 
-o	"ci" is the number of RCU callbacks that have been invoked for
-	this CPU.  Note that ci+ql is the number of callbacks that have
-	been registered in absence of CPU-hotplug activity.
-
-o	"co" is the number of RCU callbacks that have been orphaned due to
-	this CPU going offline.
-
-o	"ca" is the number of RCU callbacks that have been adopted due to
-	other CPUs going offline.  Note that ci+co-ca+ql is the number of
-	RCU callbacks registered on this CPU.
-
 There is also an rcu/rcudata.csv file with the same information in
 comma-separated-variable spreadsheet format.
 
@@ -191,7 +180,7 @@ o	"s" is the "signaled" state that drives force_quiescent_state()'s
 
 o	"jfq" is the number of jiffies remaining for this grace period
 	before force_quiescent_state() is invoked to help push things
-	along.  Note that CPUs in dyntick-idle mode throughout the grace
+	along.  Note that CPUs in dyntick-idle mode thoughout the grace
 	period will not report on their own, but rather must be check by
 	some other CPU via force_quiescent_state().
 

trunk/Documentation/cgroups/blkio-controller.txt

@@ -217,7 +217,6 @@ Details of cgroup files
 CFQ sysfs tunable
 =================
 /sys/block/<disk>/queue/iosched/group_isolation
------------------------------------------------
 
 If group_isolation=1, it provides stronger isolation between groups at the
 expense of throughput. By default group_isolation is 0. In general that
@@ -244,33 +243,6 @@ By default one should run with group_isolation=0. If that is not sufficient
 and one wants stronger isolation between groups, then set group_isolation=1
 but this will come at cost of reduced throughput.
 
-/sys/block/<disk>/queue/iosched/slice_idle
-------------------------------------------
-On a faster hardware CFQ can be slow, especially with sequential workload.
-This happens because CFQ idles on a single queue and single queue might not
-drive deeper request queue depths to keep the storage busy. In such scenarios
-one can try setting slice_idle=0 and that would switch CFQ to IOPS
-(IO operations per second) mode on NCQ supporting hardware.
-
-That means CFQ will not idle between cfq queues of a cfq group and hence be
-able to driver higher queue depth and achieve better throughput. That also
-means that cfq provides fairness among groups in terms of IOPS and not in
-terms of disk time.
-
-/sys/block/<disk>/queue/iosched/group_idle
-------------------------------------------
-If one disables idling on individual cfq queues and cfq service trees by
-setting slice_idle=0, group_idle kicks in. That means CFQ will still idle
-on the group in an attempt to provide fairness among groups.
-
-By default group_idle is same as slice_idle and does not do anything if
-slice_idle is enabled.
-
-One can experience an overall throughput drop if you have created multiple
-groups and put applications in that group which are not driving enough
-IO to keep disk busy. In that case set group_idle=0, and CFQ will not idle
-on individual groups and throughput should improve.
-
 What works
 ==========
 - Currently only sync IO queues are support. All the buffered writes are

trunk/Documentation/cputopology.txt

@@ -14,39 +14,25 @@ to /proc/cpuinfo.
 	identifier (rather than the kernel's).  The actual value is
 	architecture and platform dependent.
 
-3) /sys/devices/system/cpu/cpuX/topology/book_id:
-
-	the book ID of cpuX. Typically it is the hardware platform's
-	identifier (rather than the kernel's).	The actual value is
-	architecture and platform dependent.
-
-4) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
+3) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
 
 	internel kernel map of cpuX's hardware threads within the same
 	core as cpuX
 
-5) /sys/devices/system/cpu/cpuX/topology/core_siblings:
+4) /sys/devices/system/cpu/cpuX/topology/core_siblings:
 
 	internal kernel map of cpuX's hardware threads within the same
 	physical_package_id.
 
-6) /sys/devices/system/cpu/cpuX/topology/book_siblings:
-
-	internal kernel map of cpuX's hardware threads within the same
-	book_id.
-
 To implement it in an architecture-neutral way, a new source file,
-drivers/base/topology.c, is to export the 4 or 6 attributes. The two book
-related sysfs files will only be created if CONFIG_SCHED_BOOK is selected.
+drivers/base/topology.c, is to export the 4 attributes.
 
 For an architecture to support this feature, it must define some of
 these macros in include/asm-XXX/topology.h:
 #define topology_physical_package_id(cpu)
 #define topology_core_id(cpu)
-#define topology_book_id(cpu)
 #define topology_thread_cpumask(cpu)
 #define topology_core_cpumask(cpu)
-#define topology_book_cpumask(cpu)
 
 The type of **_id is int.
 The type of siblings is (const) struct cpumask *.
@@ -59,9 +45,6 @@ not defined by include/asm-XXX/topology.h:
 3) thread_siblings: just the given CPU
 4) core_siblings: just the given CPU
 
-For architectures that don't support books (CONFIG_SCHED_BOOK) there are no
-default definitions for topology_book_id() and topology_book_cpumask().
-
 Additionally, CPU topology information is provided under
 /sys/devices/system/cpu and includes these files.  The internal
 source for the output is in brackets ("[]").

trunk/Documentation/feature-removal-schedule.txt

@@ -386,6 +386,34 @@ Who:	Tejun Heo <tj@kernel.org>
 
 ----------------------------
 
+What:	Support for VMware's guest paravirtuliazation technique [VMI] will be
+	dropped.
+When:	2.6.37 or earlier.
+Why:	With the recent innovations in CPU hardware acceleration technologies
+	from Intel and AMD, VMware ran a few experiments to compare these
+	techniques to guest paravirtualization technique on VMware's platform.
+	These hardware assisted virtualization techniques have outperformed the
+	performance benefits provided by VMI in most of the workloads. VMware
+	expects that these hardware features will be ubiquitous in a couple of
+	years, as a result, VMware has started a phased retirement of this
+	feature from the hypervisor. We will be removing this feature from the
+	Kernel too. Right now we are targeting 2.6.37 but can retire earlier if
+	technical reasons (read opportunity to remove major chunk of pvops)
+	arise.
+
+	Please note that VMI has always been an optimization and non-VMI kernels
+	still work fine on VMware's platform.
+	Latest versions of VMware's product which support VMI are,
+	Workstation 7.0 and VSphere 4.0 on ESX side, future maintainence
+	releases for these products will continue supporting VMI.
+
+	For more details about VMI retirement take a look at this,
+	http://blogs.vmware.com/guestosguide/2009/09/vmi-retirement.html
+
+Who:	Alok N Kataria <akataria@vmware.com>
+
+----------------------------
+
 What:	Support for lcd_switch and display_get in asus-laptop driver
 When:	March 2010
 Why:	These two features use non-standard interfaces. There are the