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23 October 2021, 00:29:24 UTC
Revision 4bbf39c29bc3409d6454faf0dfa1b3b0aa2ac2af authored by Ingo Molnar on 17 February 2006, 21:52:44 UTC, committed by Linus Torvalds on 17 February 2006, 21:59:26 UTC 
[PATCH] Introduce CONFIG_DEFAULT_MIGRATION_COST
 
Heiko Carstens <heiko.carstens@de.ibm.com> wrote:

  The boot sequence on s390 sometimes takes ages and we spend a very long
  time (up to one or two minutes) in calibrate_migration_costs.  The time
  spent there differs from boot to boot.  Also the calculated costs differ
  a lot.  I've seen differences by up to a factor of 15 (yes, factor not
  percent).  Also I doubt that making these measurements make much sense on
  a completely virtualized architecture where you cannot tell how much cpu
  time you will get anyway.

So introduce the CONFIG_DEFAULT_MIGRATION_COST method for an architecture
to set the scheduler migration costs.  This turns off automatic detection
of migration costs.  Makes sense on virtual platforms, where migration
costs are hard to measure accurately.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent 05efc67
History
Tip revision: 4bbf39c29bc3409d6454faf0dfa1b3b0aa2ac2af authored by Ingo Molnar on 17 February 2006, 21:52:44 UTC
[PATCH] Introduce CONFIG_DEFAULT_MIGRATION_COST
Tip revision: 4bbf39c
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