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  1. 24 Aug, 2004 3 commits
    • Nick Piggin's avatar
      [PATCH] sched: cleanup, improve sched <=> fork APIs · 3632d86a
      Nick Piggin authored 
      Move balancing and child-runs-first logic from fork.c into sched.c where
it belongs.

* Consolidate wake_up_forked_process and wake_up_forked_thread into
  wake_up_new_process, and pass in clone_flags as suggested by Linus.  This
  removes a lot of code duplication and allows all logic to be handled in that
  function.

* Don't do balance-on-clone balancing for vfork'ed threads.

* Don't do set_task_cpu or balance one clone in wake_up_new_process. 
  Instead do it in sched_fork to fix set_cpus_allowed races.

* Don't do child-runs-first for CLONE_VM processes, as there is obviously no
  COW benifit to be had.  This is a big one, it enables Andi's workload to run
  well without clone balancing, because the OpenMP child threads can get
  balanced off to other nodes *before* they start running and allocating
  memory.

* Rename sched_balance_exec to sched_exec: hide the policy from the API.


From: Ingo Molnar <mingo@elte.hu>

  rename wake_up_new_process -> wake_up_new_task.

  in sched.c we are gradually moving away from the overloaded 'process' or
  'thread' notion to the traditional task (or context) naming.
Signed-off-by: default avatarNick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      3632d86a
    • Nick Piggin's avatar
      [PATCH] sched: cleanup init_idle() · 70a0b8e7
      Nick Piggin authored 
      Clean up init_idle to not use wake_up_forked_process, then undo all the stuff
that call does.  Instead, do everything in init_idle.

Make double_rq_lock depend on CONFIG_SMP because it is no longer used on UP.
Signed-off-by: default avatarNick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      70a0b8e7
    • Ingo Molnar's avatar
      [PATCH] sched: fix timeslice calculations for HZ=1000. · b2a0e913
      Ingo Molnar authored 
      The main benefit is that with the default HZ=1000 nice +19 tasks now get 5
msecs of timeslices, so the ratio of CPU use is linear.  (nice 0 task gets
20 times more CPU time than a nice 19 task.  Prior this change the ratio
was 1:10)

another effect is that nice 0 tasks now get a round 100 msecs of timeslices
(as intended), instead of 102 msecs.

here's a table of old/new timeslice values, for HZ=1000 and 100:

                      HZ=1000         (   HZ=100   )
                    old    new        ( old    new )

        nice -20:   200    200        ( 200    200 )
        nice -19:   195    195        ( 190    190 )
        ...
        nice 0:     102    100        ( 100    100 )
        nice 1:      97     95        (  90     90 )
        nice 2:      92     90        (  90     90 )
        ...
        nice 17:     19     15        (  10     10 )
        nice 18:     14     10        (  10     10 )
        nice 19:     10      5        (  10     10 )

i've tested the patch on x86.
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      b2a0e913
  3. 23 Aug, 2004 37 commits
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