• Tejun Heo's avatar
    fscache: convert object to use workqueue instead of slow-work · 8b8edefa
    Tejun Heo authored
    Make fscache object state transition callbacks use workqueue instead
    of slow-work.  New dedicated unbound CPU workqueue fscache_object_wq
    is created.  get/put callbacks are renamed and modified to take
    @object and called directly from the enqueue wrapper and the work
    function.  While at it, make all open coded instances of get/put to
    use fscache_get/put_object().
    
    * Unbound workqueue is used.
    
    * work_busy() output is printed instead of slow-work flags in object
      debugging outputs.  They mean basically the same thing bit-for-bit.
    
    * sysctl fscache.object_max_active added to control concurrency.  The
      default value is nr_cpus clamped between 4 and
      WQ_UNBOUND_MAX_ACTIVE.
    
    * slow_work_sleep_till_thread_needed() is replaced with fscache
      private implementation fscache_object_sleep_till_congested() which
      waits on fscache_object_wq congestion.
    
    * debugfs support is dropped for now.  Tracing API based debug
      facility is planned to be added.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Acked-by: default avatarDavid Howells <dhowells@redhat.com>
    8b8edefa
fscache.txt 18.6 KB