1. 16 Jun, 2011 1 commit
  2. 19 Oct, 2007 1 commit
    • Balbir Singh's avatar
      Add cgroupstats · 846c7bb0
      Balbir Singh authored
      This patch is inspired by the discussion at
      http://lkml.org/lkml/2007/4/11/187 and implements per cgroup statistics
      as suggested by Andrew Morton in http://lkml.org/lkml/2007/4/11/263.  The
      patch is on top of 2.6.21-mm1 with Paul's cgroups v9 patches (forward
      ported)
      
      This patch implements per cgroup statistics infrastructure and re-uses
      code from the taskstats interface.  A new set of cgroup operations are
      registered with commands and attributes.  It should be very easy to
      *extend* per cgroup statistics, by adding members to the cgroupstats
      structure.
      
      The current model for cgroupstats is a pull, a push model (to post
      statistics on interesting events), should be very easy to add.  Currently
      user space requests for statistics by passing the cgroup file
      descriptor.  Statistics about the state of all the tasks in the cgroup
      is returned to user space.
      
      TODO's/NOTE:
      
      This patch provides an infrastructure for implementing cgroup statistics.
      Based on the needs of each controller, we can incrementally add more statistics,
      event based support for notification of statistics, accumulation of taskstats
      into cgroup statistics in the future.
      
      Sample output
      
      # ./cgroupstats -C /cgroup/a
      sleeping 2, blocked 0, running 1, stopped 0, uninterruptible 0
      
      # ./cgroupstats -C /cgroup/
      sleeping 154, blocked 0, running 0, stopped 0, uninterruptible 0
      
      If the approach looks good, I'll enhance and post the user space utility for
      the same
      
      Feedback, comments, test results are always welcome!
      
      [akpm@linux-foundation.org: build fix]
      Signed-off-by: default avatarBalbir Singh <balbir@linux.vnet.ibm.com>
      Cc: Paul Menage <menage@google.com>
      Cc: Jay Lan <jlan@engr.sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      846c7bb0