sched: Rework check_for_tasks()
1) Iterate thru all of threads in the system. Check for all threads, not only for group leaders. 2) Check for p->on_rq instead of p->state and cputime. Preempted task in !TASK_RUNNING state OR just created task may be queued, that we want to be reported too. 3) Use read_lock() instead of write_lock(). This function does not change any structures, and read_lock() is enough. Signed-off-by: NKirill Tkhai <ktkhai@parallels.com> Reviewed-by: NSrikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ben Segall <bsegall@google.com> Cc: Fabian Frederick <fabf@skynet.be> Cc: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Cc: Konstantin Khorenko <khorenko@parallels.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael wang <wangyun@linux.vnet.ibm.com> Cc: Mike Galbraith <umgwanakikbuti@gmail.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Paul Turner <pjt@google.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Todd E Brandt <todd.e.brandt@linux.intel.com> Cc: Toshi Kani <toshi.kani@hp.com> Signed-off-by: NPeter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1403684395.3462.44.camel@tkhaiSigned-off-by: NIngo Molnar <mingo@kernel.org>
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