---

yaml
---
r: 143541
b: refs/heads/master
c: 0e983d3
h: refs/heads/master
i:
  143539: 2239cf9
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 91ec65ba335db80b686f93b9eb531d537e712e61
+refs/heads/master: 0e983d3c38f87d405beb1ebbe2fea11eb01cc4c6

trunk/Documentation/ABI/testing/debugfs-pktcdvd

@@ -1,4 +1,4 @@
-What:           /sys/kernel/debug/pktcdvd/pktcdvd[0-7]
+What:           /debug/pktcdvd/pktcdvd[0-7]
 Date:           Oct. 2006
 KernelVersion:  2.6.20
 Contact:        Thomas Maier <balagi@justmail.de>
@@ -10,10 +10,10 @@ debugfs interface
 The pktcdvd module (packet writing driver) creates
 these files in debugfs:
 
-/sys/kernel/debug/pktcdvd/pktcdvd[0-7]/
+/debug/pktcdvd/pktcdvd[0-7]/
     info            (0444) Lots of driver statistics and infos.
 
 Example:
 -------
 
-cat /sys/kernel/debug/pktcdvd/pktcdvd0/info
+cat /debug/pktcdvd/pktcdvd0/info

trunk/Documentation/DocBook/Makefile

@@ -31,7 +31,7 @@ PS_METHOD	= $(prefer-db2x)
 
 ###
 # The targets that may be used.
-PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs cleandocs
+PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs
 
 BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
 xmldocs: $(BOOKS)
@@ -213,12 +213,11 @@ silent_gen_xml = :
 dochelp:
 	@echo  ' Linux kernel internal documentation in different formats:'
 	@echo  '  htmldocs        - HTML'
+	@echo  '  installmandocs  - install man pages generated by mandocs'
+	@echo  '  mandocs         - man pages'
 	@echo  '  pdfdocs         - PDF'
 	@echo  '  psdocs          - Postscript'
 	@echo  '  xmldocs         - XML DocBook'
-	@echo  '  mandocs         - man pages'
-	@echo  '  installmandocs  - install man pages generated by mandocs'
-	@echo  '  cleandocs       - clean all generated DocBook files'
 
 ###
 # Temporary files left by various tools
@@ -236,10 +235,6 @@ clean-files := $(DOCBOOKS) \
 
 clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS)) man
 
-cleandocs:
-	$(Q)rm -f $(call objectify, $(clean-files))
-	$(Q)rm -rf $(call objectify, $(clean-dirs))
-
 # Declare the contents of the .PHONY variable as phony.  We keep that
 # information in a variable se we can use it in if_changed and friends.
 

trunk/Documentation/block/biodoc.txt

@@ -1040,21 +1040,23 @@ Front merges are handled by the binary trees in AS and deadline schedulers.
 iii. Plugging the queue to batch requests in anticipation of opportunities for
      merge/sort optimizations
 
+This is just the same as in 2.4 so far, though per-device unplugging
+support is anticipated for 2.5. Also with a priority-based i/o scheduler,
+such decisions could be based on request priorities.
+
 Plugging is an approach that the current i/o scheduling algorithm resorts to so
 that it collects up enough requests in the queue to be able to take
 advantage of the sorting/merging logic in the elevator. If the
 queue is empty when a request comes in, then it plugs the request queue
-(sort of like plugging the bath tub of a vessel to get fluid to build up)
+(sort of like plugging the bottom of a vessel to get fluid to build up)
 till it fills up with a few more requests, before starting to service
 the requests. This provides an opportunity to merge/sort the requests before
 passing them down to the device. There are various conditions when the queue is
 unplugged (to open up the flow again), either through a scheduled task or
 could be on demand. For example wait_on_buffer sets the unplugging going
-through sync_buffer() running blk_run_address_space(mapping). Or the caller
-can do it explicity through blk_unplug(bdev). So in the read case,
-the queue gets explicitly unplugged as part of waiting for completion on that
-buffer. For page driven IO, the address space ->sync_page() takes care of
-doing the blk_run_address_space().
+(by running tq_disk) so the read gets satisfied soon. So in the read case,
+the queue gets explicitly unplugged as part of waiting for completion,
+in fact all queues get unplugged as a side-effect.
 
 Aside:
   This is kind of controversial territory, as it's not clear if plugging is
@@ -1065,6 +1067,11 @@ Aside:
   multi-page bios being queued in one shot, we may not need to wait to merge
   a big request from the broken up pieces coming by.
 
+  Per-queue granularity unplugging (still a Todo) may help reduce some of the
+  concerns with just a single tq_disk flush approach. Something like
+  blk_kick_queue() to unplug a specific queue (right away ?)
+  or optionally, all queues, is in the plan.
+
 4.4 I/O contexts
 I/O contexts provide a dynamically allocated per process data area. They may
 be used in I/O schedulers, and in the block layer (could be used for IO statis,

trunk/Documentation/cgroups/cpuacct.txt

@@ -30,21 +30,3 @@ The above steps create a new group g1 and move the current shell
 process (bash) into it. CPU time consumed by this bash and its children
 can be obtained from g1/cpuacct.usage and the same is accumulated in
 /cgroups/cpuacct.usage also.
-
-cpuacct.stat file lists a few statistics which further divide the
-CPU time obtained by the cgroup into user and system times. Currently
-the following statistics are supported:
-
-user: Time spent by tasks of the cgroup in user mode.
-system: Time spent by tasks of the cgroup in kernel mode.
-
-user and system are in USER_HZ unit.
-
-cpuacct controller uses percpu_counter interface to collect user and
-system times. This has two side effects:
-
-- It is theoretically possible to see wrong values for user and system times.
-  This is because percpu_counter_read() on 32bit systems isn't safe
-  against concurrent writes.
-- It is possible to see slightly outdated values for user and system times
-  due to the batch processing nature of percpu_counter.

trunk/Documentation/cgroups/memory.txt

@@ -6,14 +6,15 @@ used here with the memory controller that is used in hardware.
 
 Salient features
 
-a. Enable control of Anonymous, Page Cache (mapped and unmapped) and
-   Swap Cache memory pages.
+a. Enable control of both RSS (mapped) and Page Cache (unmapped) pages
 b. The infrastructure allows easy addition of other types of memory to control
 c. Provides *zero overhead* for non memory controller users
 d. Provides a double LRU: global memory pressure causes reclaim from the
    global LRU; a cgroup on hitting a limit, reclaims from the per
    cgroup LRU
 
+NOTE: Swap Cache (unmapped) is not accounted now.
+
 Benefits and Purpose of the memory controller
 
 The memory controller isolates the memory behaviour of a group of tasks
@@ -289,44 +290,34 @@ will be charged as a new owner of it.
   moved to the parent. If you want to avoid that, force_empty will be useful.
 
 5.2 stat file
-
-memory.stat file includes following statistics
-
-cache		- # of bytes of page cache memory.
-rss		- # of bytes of anonymous and swap cache memory.
-pgpgin		- # of pages paged in (equivalent to # of charging events).
-pgpgout		- # of pages paged out (equivalent to # of uncharging events).
-active_anon	- # of bytes of anonymous and  swap cache memory on active
-		  lru list.
-inactive_anon	- # of bytes of anonymous memory and swap cache memory on
-		  inactive lru list.
-active_file	- # of bytes of file-backed memory on active lru list.
-inactive_file	- # of bytes of file-backed memory on inactive lru list.
-unevictable	- # of bytes of memory that cannot be reclaimed (mlocked etc).
-
-The following additional stats are dependent on CONFIG_DEBUG_VM.
-
-inactive_ratio		- VM internal parameter. (see mm/page_alloc.c)
-recent_rotated_anon	- VM internal parameter. (see mm/vmscan.c)
-recent_rotated_file	- VM internal parameter. (see mm/vmscan.c)
-recent_scanned_anon	- VM internal parameter. (see mm/vmscan.c)
-recent_scanned_file	- VM internal parameter. (see mm/vmscan.c)
-
-Memo:
+  memory.stat file includes following statistics (now)
+	cache			- # of pages from page-cache and shmem.
+	rss			- # of pages from anonymous memory.
+	pgpgin			- # of event of charging
+	pgpgout			- # of event of uncharging
+	active_anon		- # of pages on active lru of anon, shmem.
+	inactive_anon 		- # of pages on active lru of anon, shmem
+	active_file		- # of pages on active lru of file-cache
+	inactive_file		- # of pages on inactive lru of file cache
+	unevictable		- # of pages cannot be reclaimed.(mlocked etc)
+
+	Below is depend on CONFIG_DEBUG_VM.
+	inactive_ratio		- VM internal parameter. (see mm/page_alloc.c)
+	recent_rotated_anon	- VM internal parameter. (see mm/vmscan.c)
+	recent_rotated_file	- VM internal parameter. (see mm/vmscan.c)
+	recent_scanned_anon 	- VM internal parameter. (see mm/vmscan.c)
+	recent_scanned_file 	- VM internal parameter. (see mm/vmscan.c)
+
+  Memo:
 	recent_rotated means recent frequency of lru rotation.
 	recent_scanned means recent # of scans to lru.
 	showing for better debug please see the code for meanings.
 
-Note:
-	Only anonymous and swap cache memory is listed as part of 'rss' stat.
-	This should not be confused with the true 'resident set size' or the
-	amount of physical memory used by the cgroup. Per-cgroup rss
-	accounting is not done yet.
 
 5.3 swappiness
   Similar to /proc/sys/vm/swappiness, but affecting a hierarchy of groups only.
 
-  Following cgroups' swapiness can't be changed.
+  Following cgroup's swapiness can't be changed.
   - root cgroup (uses /proc/sys/vm/swappiness).
   - a cgroup which uses hierarchy and it has child cgroup.
   - a cgroup which uses hierarchy and not the root of hierarchy.

trunk/Documentation/cgroups/resource_counter.txt

@@ -47,18 +47,13 @@ to work with it.
 
 2. Basic accounting routines
 
- a. void res_counter_init(struct res_counter *rc,
-				struct res_counter *rc_parent)
+ a. void res_counter_init(struct res_counter *rc)
 
  	Initializes the resource counter. As usual, should be the first
 	routine called for a new counter.
 
-	The struct res_counter *parent can be used to define a hierarchical
-	child -> parent relationship directly in the res_counter structure,
-	NULL can be used to define no relationship.
-
- c. int res_counter_charge(struct res_counter *rc, unsigned long val,
-				struct res_counter **limit_fail_at)
+ b. int res_counter_charge[_locked]
+			(struct res_counter *rc, unsigned long val)
 
 	When a resource is about to be allocated it has to be accounted
 	with the appropriate resource counter (controller should determine
@@ -72,25 +67,15 @@ to work with it.
 	  * if the charging is performed first, then it should be uncharged
 	    on error path (if the one is called).
 
-	If the charging fails and a hierarchical dependency exists, the
-	limit_fail_at parameter is set to the particular res_counter element
-	where the charging failed.
-
- d. int res_counter_charge_locked
-			(struct res_counter *rc, unsigned long val)
-
-	The same as res_counter_charge(), but it must not acquire/release the
-	res_counter->lock internally (it must be called with res_counter->lock
-	held).
-
- e. void res_counter_uncharge[_locked]
+ c. void res_counter_uncharge[_locked]
 			(struct res_counter *rc, unsigned long val)
 
 	When a resource is released (freed) it should be de-accounted
 	from the resource counter it was accounted to.  This is called
 	"uncharging".
 
-	The _locked routines imply that the res_counter->lock is taken.
+    The _locked routines imply that the res_counter->lock is taken.
+
 
  2.1 Other accounting routines
 

trunk/Documentation/feature-removal-schedule.txt

@@ -428,12 +428,3 @@ Why:	In 2.6.27, the semantics of /sys/bus/pci/slots was redefined to
 	After a reasonable transition period, we will remove the legacy
 	fakephp interface.
 Who:	Alex Chiang <achiang@hp.com>
-
----------------------------
-
-What:	i2c-voodoo3 driver
-When:	October 2009
-Why:	Superseded by tdfxfb. I2C/DDC support used to live in a separate
-	driver but this caused driver conflicts.
-Who:	Jean Delvare <khali@linux-fr.org>
-	Krzysztof Helt <krzysztof.h1@wp.pl>

trunk/Documentation/infiniband/ipoib.txt

@@ -24,49 +24,6 @@ Partitions and P_Keys
   The P_Key for any interface is given by the "pkey" file, and the
   main interface for a subinterface is in "parent."
 
-Datagram vs Connected modes
-
-  The IPoIB driver supports two modes of operation: datagram and
-  connected.  The mode is set and read through an interface's
-  /sys/class/net/<intf name>/mode file.
-
-  In datagram mode, the IB UD (Unreliable Datagram) transport is used
-  and so the interface MTU has is equal to the IB L2 MTU minus the
-  IPoIB encapsulation header (4 bytes).  For example, in a typical IB
-  fabric with a 2K MTU, the IPoIB MTU will be 2048 - 4 = 2044 bytes.
-
-  In connected mode, the IB RC (Reliable Connected) transport is used.
-  Connected mode is to takes advantage of the connected nature of the
-  IB transport and allows an MTU up to the maximal IP packet size of
-  64K, which reduces the number of IP packets needed for handling
-  large UDP datagrams, TCP segments, etc and increases the performance
-  for large messages.
-
-  In connected mode, the interface's UD QP is still used for multicast
-  and communication with peers that don't support connected mode. In
-  this case, RX emulation of ICMP PMTU packets is used to cause the
-  networking stack to use the smaller UD MTU for these neighbours.
-
-Stateless offloads
-
-  If the IB HW supports IPoIB stateless offloads, IPoIB advertises
-  TCP/IP checksum and/or Large Send (LSO) offloading capability to the
-  network stack.
-
-  Large Receive (LRO) offloading is also implemented and may be turned
-  on/off using ethtool calls.  Currently LRO is supported only for
-  checksum offload capable devices.
-
-  Stateless offloads are supported only in datagram mode.  
-
-Interrupt moderation
-
-  If the underlying IB device supports CQ event moderation, one can
-  use ethtool to set interrupt mitigation parameters and thus reduce
-  the overhead incurred by handling interrupts.  The main code path of
-  IPoIB doesn't use events for TX completion signaling so only RX
-  moderation is supported.
-
 Debugging Information
 
   By compiling the IPoIB driver with CONFIG_INFINIBAND_IPOIB_DEBUG set
@@ -98,5 +55,3 @@ References
     http://ietf.org/rfc/rfc4391.txt 
   IP over InfiniBand (IPoIB) Architecture (RFC 4392)
     http://ietf.org/rfc/rfc4392.txt 
-  IP over InfiniBand: Connected Mode (RFC 4755)
-    http://ietf.org/rfc/rfc4755.txt