1. 16 Jan, 2017 3 commits
    • Tejun Heo's avatar
      cgroup: call subsys->*attach() only for subsystems which are actually affected by migration · bfc2cf6f
      Tejun Heo authored
      Currently, subsys->*attach() callbacks are called for all subsystems
      which are attached to the hierarchy on which the migration is taking
      place.
      
      With cgroup_migrate_prepare_dst() filtering out identity migrations,
      v1 hierarchies can avoid spurious ->*attach() callback invocations
      where the source and destination csses are identical; however, this
      isn't enough on v2 as only a subset of the attached controllers can be
      affected on controller enable/disable.
      
      While spurious ->*attach() invocations aren't critically broken,
      they're unnecessary overhead and can lead to temporary overcharges on
      certain controllers.  Fix it by tracking which subsystems are affected
      by a migration and invoking ->*attach() callbacks only on those
      subsystems.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarZefan Li <lizefan@huawei.com>
      bfc2cf6f
    • Tejun Heo's avatar
      cgroup: track migration context in cgroup_mgctx · e595cd70
      Tejun Heo authored
      cgroup migration is performed in four steps - css_set preloading,
      addition of target tasks, actual migration, and clean up.  A list
      named preloaded_csets is used to track the preloading.  This is a bit
      too restricted and the code is already depending on the subtlety that
      all source css_sets appear before destination ones.
      
      Let's create struct cgroup_mgctx which keeps track of everything
      during migration.  Currently, it has separate preload lists for source
      and destination csets and also embeds cgroup_taskset which is used
      during the actual migration.  This moves struct cgroup_taskset
      definition to cgroup-internal.h.
      
      This patch doesn't cause any functional changes.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarZefan Li <lizefan@huawei.com>
      e595cd70
    • Tejun Heo's avatar
      cgroup: cosmetic update to cgroup_taskset_add() · d8ebf519
      Tejun Heo authored
      cgroup_taskset_add() was using list_add_tail() when for source csets
      but list_move_tail() for destination.  As the operations are gated by
      list_empty() test, list_move_tail() is equivalent to list_add_tail()
      here.  Use list_add_tail() too for destination csets too.
      
      This doesn't cause any functional changes.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarZefan Li <lizefan@huawei.com>
      d8ebf519
  2. 10 Jan, 2017 1 commit
  3. 27 Dec, 2016 15 commits
  4. 26 Dec, 2016 2 commits
    • Linus Torvalds's avatar
      Linux 4.10-rc1 · 7ce7d89f
      Linus Torvalds authored
      7ce7d89f
    • Larry Finger's avatar
      powerpc: Fix build warning on 32-bit PPC · 8ae679c4
      Larry Finger authored
      I am getting the following warning when I build kernel 4.9-git on my
      PowerBook G4 with a 32-bit PPC processor:
      
          AS      arch/powerpc/kernel/misc_32.o
        arch/powerpc/kernel/misc_32.S:299:7: warning: "CONFIG_FSL_BOOKE" is not defined [-Wundef]
      
      This problem is evident after commit 989cea5c ("kbuild: prevent
      lib-ksyms.o rebuilds"); however, this change in kbuild only exposes an
      error that has been in the code since 2005 when this source file was
      created.  That was with commit 9994a338 ("powerpc: Introduce
      entry_{32,64}.S, misc_{32,64}.S, systbl.S").
      
      The offending line does not make a lot of sense.  This error does not
      seem to cause any errors in the executable, thus I am not recommending
      that it be applied to any stable versions.
      
      Thanks to Nicholas Piggin for suggesting this solution.
      
      Fixes: 9994a338 ("powerpc: Introduce entry_{32,64}.S, misc_{32,64}.S, systbl.S")
      Signed-off-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
      Cc: Nicholas Piggin <npiggin@gmail.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: linuxppc-dev@lists.ozlabs.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8ae679c4
  5. 25 Dec, 2016 19 commits