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  1. 09 11月, 2018 10 次提交
    • W
      cpuset: Use descriptive text when reading/writing cpuset.sched.partition · bb5b553c
      由 Waiman Long 提交于 
      Currently, cpuset.sched.partition returns the values, 0, 1 or -1 on
read. A person who is not familiar with the partition code may not
understand what they mean.

In order to make cpuset.sched.partition more user-friendly, it will
now display the following descriptive text on read:

  "root" - A partition root (top cpuset of a partition)
  "member" - A non-root member of a partition
  "root invalid" - An invalid partition root

Note that there is at least one partition in the whole cgroup hierarchy.
The top cpuset is the root of that partition.  The rests are either a
root if it starts a new partition or a member of a partition.

The cpuset.sched.partition file will now also accept "root" and
"member" besides 1 and 0 as valid input values. The "root invalid"
value is internal only and cannot be written to the file.
Suggested-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      bb5b553c
    • W
      cpuset: Expose cpus.effective and mems.effective on cgroup v2 root · 5776cecc
      由 Waiman Long 提交于 
      Because of the fact that setting the "cpuset.sched.partition" in
a direct child of root can remove CPUs from the root's effective CPU
list, it makes sense to know what CPUs are left in the root cgroup for
scheduling purpose. So the "cpuset.cpus.effective" control file is now
exposed in the v2 cgroup root.

For consistency, the "cpuset.mems.effective" control file is exposed
as well.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      5776cecc
    • W
      cpuset: Make generate_sched_domains() work with partition · 0ccea8fe
      由 Waiman Long 提交于 
      The generate_sched_domains() function is modified to make it work
correctly with the newly introduced subparts_cpus mask for scheduling
domains generation.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      0ccea8fe
    • W
      cpuset: Make CPU hotplug work with partition · 4b842da2
      由 Waiman Long 提交于 
      When there is a cpu hotplug event (CPU online or offline), the partitions
may need to be reconfigured and regenerated. So code is added to the
hotplug functions to make them work with new subparts_cpus mask to
compute the right effective_cpus for each of the affected cpusets.
It may also change the state of a partition root from real one to an
erroneous one or vice versa.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      4b842da2
    • W
      cpuset: Track cpusets that use parent's effective_cpus · 4716909c
      由 Waiman Long 提交于 
      In the default hierarchy, a cpuset will use the parent's effective_cpus
if none of the requested CPUs can be granted from the parent. That can
be a problem if a parent is a partition root with children partition
roots. Changes to a parent's effective_cpus list due to changes in a
child partition root may not be properly reflected in a child cpuset
that use parent's effective_cpus because the cpu_exclusive rule of a
partition root will not guard against that.

In order to avoid the mismatch, two new tracking variables are added to
the cpuset structure to track if a cpuset uses parent's effective_cpus
and the number of children cpusets that use its effective_cpus. So
whenever cpumask changes are made to a parent, it will also check to
see if it has other children cpusets that use its effective_cpus and
call update_cpumasks_hier() if that is the case.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      4716909c
    • W
      cpuset: Add an error state to cpuset.sched.partition · 3881b861
      由 Waiman Long 提交于 
      When external events like CPU offlining or user events like changing
the cpu list of an ancestor cpuset happen, update_cpumasks_hier()
will be called to update the effective cpus of each of the affected
cpusets. That will then call update_parent_subparts_cpumask() if
partitions are impacted.

Currently, these events may cause update_parent_subparts_cpumask()
to return error if none of the requested cpus are available or it will
consume all the cpus in the parent partition root. Handling these errors
is problematic as the states may become inconsistent.

Instead of letting update_parent_subparts_cpumask() return error, a new
error state (-1) is added to the partition_root_state flag to designate
the fact that the partition is no longer valid. IOW, it is no longer a
real partition root, but the CS_CPU_EXCLUSIVE flag will still be set
as it can be changed back to a real one if favorable change happens
later on.

This new error state is set internally and user cannot write this new
value to "cpuset.sched.partition".
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      3881b861
    • W
      cpuset: Add new v2 cpuset.sched.partition flag · ee8dde0c
      由 Waiman Long 提交于 
      A new cpuset.sched.partition boolean flag is added to cpuset v2.
This new flag, if set, indicates that the cgroup is the root of a
new scheduling domain or partition that includes itself and all its
descendants except those that are scheduling domain roots themselves
and their descendants.

With this new flag, one can directly create as many partitions as
necessary without ever using the v1 trick of turning off load balancing
in specific cpusets to create partitions as a side effect.

This new flag is owned by the parent and will cause the CPUs in the
cpuset to be removed from the effective CPUs of its parent.

This is implemented internally by adding a new subparts_cpus mask that
holds the CPUs belonging to child partitions so that:

        subparts_cpus | effective_cpus = cpus_allowed
        subparts_cpus & effective_cpus = 0

This new flag can only be turned on in a cpuset if its parent is a
partition root itself. The state of this flag cannot be changed if the
cpuset has children.

Once turned on, further changes to "cpuset.cpus" is allowed as long
as there is at least one CPU left that can be granted from the parent
and a child partition root cannot use up all the CPUs in the parent's
effective_cpus.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      ee8dde0c
    • W
      cpuset: Simply allocation and freeing of cpumasks · bf92370c
      由 Waiman Long 提交于 
      The previous commit introduces a new subparts_cpus mask into the cpuset
data structure and a new tmpmasks structure.  Managing the allocation
and freeing of those cpumasks is becoming more complex.

So a number of helper functions are added to simplify and streamline
the management of those cpumasks. To make it simple, all the cpumasks
are now pre-cleared on allocation.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      bf92370c
    • W
      cpuset: Define data structures to support scheduling partition · 58b74842
      由 Waiman Long 提交于 
      >From a cpuset point of view, a scheduling partition is a group of
cpusets with their own set of exclusive CPUs that are not shared by
other tasks outside the scheduling partition.

In the legacy hierarchy, scheduling partitions are supported indirectly
via the right use of the load balancing and the exclusive CPUs flag
which is not intuitive and can be hard to use.

To fully support the concept of scheduling partitions in the default
hierarchy, we need to add some new field into the cpuset structure as
well as a new tmpmasks structure that is used to pre-allocate cpumasks
at the top level cpuset functions to avoid memory allocation in inner
functions as memory allocation failure in those inner functions may
cause a cpuset to have inconsistent states.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      58b74842
    • W
      cpuset: Enable cpuset controller in default hierarchy · 4ec22e9c
      由 Waiman Long 提交于 
      Given the fact that thread mode had been merged into 4.14, it is now
time to enable cpuset to be used in the default hierarchy (cgroup v2)
as it is clearly threaded.

The cpuset controller had experienced feature creep since its
introduction more than a decade ago. Besides the core cpus and mems
control files to limit cpus and memory nodes, there are a bunch of
additional features that can be controlled from the userspace. Some of
the features are of doubtful usefulness and may not be actively used.

This patch enables cpuset controller in the default hierarchy with
a minimal set of features, namely just the cpus and mems and their
effective_* counterparts.  We can certainly add more features to the
default hierarchy in the future if there is a real user need for them
later on.

Alternatively, with the unified hiearachy, it may make more sense
to move some of those additional cpuset features, if desired, to
memory controller or may be to the cpu controller instead of staying
with cpuset.
Signed-off-by: NWaiman Long <longman@redhat.com>
Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NTejun Heo <tj@kernel.org>
      4ec22e9c
  3. 06 11月, 2018 1 次提交
  5. 05 11月, 2018 5 次提交
    • L
      Linux 4.20-rc1 · 65102238
      由 Linus Torvalds 提交于
      65102238
    • L
      Merge tag 'tags/upstream-4.20-rc1' of git://git.infradead.org/linux-ubifs · 42bd06e9
      由 Linus Torvalds 提交于 
      Pull UBIFS updates from Richard Weinberger:

 - Full filesystem authentication feature, UBIFS is now able to have the
   whole filesystem structure authenticated plus user data encrypted and
   authenticated.

 - Minor cleanups

* tag 'tags/upstream-4.20-rc1' of git://git.infradead.org/linux-ubifs: (26 commits)
  ubifs: Remove unneeded semicolon
  Documentation: ubifs: Add authentication whitepaper
  ubifs: Enable authentication support
  ubifs: Do not update inode size in-place in authenticated mode
  ubifs: Add hashes and HMACs to default filesystem
  ubifs: authentication: Authenticate super block node
  ubifs: Create hash for default LPT
  ubfis: authentication: Authenticate master node
  ubifs: authentication: Authenticate LPT
  ubifs: Authenticate replayed journal
  ubifs: Add auth nodes to garbage collector journal head
  ubifs: Add authentication nodes to journal
  ubifs: authentication: Add hashes to index nodes
  ubifs: Add hashes to the tree node cache
  ubifs: Create functions to embed a HMAC in a node
  ubifs: Add helper functions for authentication support
  ubifs: Add separate functions to init/crc a node
  ubifs: Format changes for authentication support
  ubifs: Store read superblock node
  ubifs: Drop write_node
  ...
      42bd06e9
    • L
      Merge tag 'nfs-for-4.20-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs · 4710e789
      由 Linus Torvalds 提交于 
      Pull NFS client bugfixes from Trond Myklebust:
 "Highlights include:

  Bugfix:
   - Fix build issues on architectures that don't provide 64-bit cmpxchg

  Cleanups:
   - Fix a spelling mistake"

* tag 'nfs-for-4.20-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: fix spelling mistake, EACCESS -> EACCES
  SUNRPC: Use atomic(64)_t for seq_send(64)
      4710e789
    • L
      Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 35e74524
      由 Linus Torvalds 提交于 
      Pull more timer updates from Thomas Gleixner:
 "A set of commits for the new C-SKY architecture timers"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  dt-bindings: timer: gx6605s SOC timer
  clocksource/drivers/c-sky: Add gx6605s SOC system timer
  dt-bindings: timer: C-SKY Multi-processor timer
  clocksource/drivers/c-sky: Add C-SKY SMP timer
      35e74524
    • L
      Merge tag 'ntb-4.20' of git://github.com/jonmason/ntb · 04578e84
      由 Linus Torvalds 提交于 
      Pull NTB updates from Jon Mason:
 "Fairly minor changes and bug fixes:

  NTB IDT thermal changes and hook into hwmon, ntb_netdev clean-up of
  private struct, and a few bug fixes"

* tag 'ntb-4.20' of git://github.com/jonmason/ntb:
  ntb: idt: Alter the driver info comments
  ntb: idt: Discard temperature sensor IRQ handler
  ntb: idt: Add basic hwmon sysfs interface
  ntb: idt: Alter temperature read method
  ntb_netdev: Simplify remove with client device drvdata
  NTB: transport: Try harder to alloc an aligned MW buffer
  ntb: ntb_transport: Mark expected switch fall-throughs
  ntb: idt: Set PCIe bus address to BARLIMITx
  NTB: ntb_hw_idt: replace IS_ERR_OR_NULL with regular NULL checks
  ntb: intel: fix return value for ndev_vec_mask()
  ntb_netdev: fix sleep time mismatch
      04578e84
  7. 04 11月, 2018 24 次提交