Siddha, Suresh B wrote:
Appended patch makes sched domain degenerate really work.
For example, now NUMA domain really gets removed on a non-NUMA system.
Signed-off-by: Suresh Siddha <[email protected]>
--- linux-2.6.12-rc2-mm3/kernel/sched.c 2005-04-13 11:15:00.942609504 -0700
+++ linux-mc/kernel/sched.c 2005-04-13 10:44:37.400829992 -0700
@@ -4777,7 +4777,7 @@ static int __devinit sd_parent_degenerat
/* WAKE_BALANCE is a subset of WAKE_AFFINE */
if (cflags & SD_WAKE_AFFINE)
pflags &= ~SD_WAKE_BALANCE;
- if ((~sd->flags) & parent->flags)
+ if (~cflags & pflags)
return 0;
return 1;
Thanks, I need a brown paper bag.
I think instead of the other 2 hunks in your patch I would like
to do it the following way (I hope I get this right, finally).
--
SUSE Labs, Novell Inc.
Make sched-remove-degenerate-domains.patch actually work.
Signed-off-by: Suresh Siddha <[email protected]>
Catch more (hopefully all) cases.
Signed-off-by: Nick Piggin <[email protected]>
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c 2005-04-15 22:52:25.000000000 +1000
+++ linux-2.6/kernel/sched.c 2005-04-15 22:58:54.000000000 +1000
@@ -4844,7 +4844,14 @@ static int __devinit sd_parent_degenerat
/* WAKE_BALANCE is a subset of WAKE_AFFINE */
if (cflags & SD_WAKE_AFFINE)
pflags &= ~SD_WAKE_BALANCE;
- if ((~sd->flags) & parent->flags)
+ /* Flags needing groups don't count if only 1 group in parent */
+ if (parent->groups == parent->groups->next) {
+ pflags &= ~(SD_LOAD_BALANCE |
+ SD_BALANCE_NEWIDLE |
+ SD_BALANCE_FORK |
+ SD_BALANCE_EXEC);
+ }
+ if (~cflags & pflags)
return 0;
return 1;
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