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sched/numa: Update the scan period without holding the numa_group lock

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The metrics for updating scan periods are local or task specific.
Currently this update happens under the numa_group lock, which seems
unnecessary. Hence move this update outside the lock.

Running SPECjbb2005 on a 4 node machine and comparing bops/JVM
JVMS  LAST_PATCH  WITH_PATCH  %CHANGE
16    25355.9     25645.4     1.141
1     72812       72142       -0.92

Signed-off-by: Srikar Dronamraju <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Srikar Dronamraju 2018-06-20 22:32:55 +05:30 • committed by Ingo Molnar
commit 30619c89b1
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/fair.c
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@ -2170,8 +2170,6 @@ static void task_numa_placement(struct task_struct *p)
}
}
update_task_scan_period(p, fault_types[0], fault_types[1]);
if (p->numa_group) {
numa_group_count_active_nodes(p->numa_group);
spin_unlock_irq(group_lock);
@ -2186,6 +2184,8 @@ static void task_numa_placement(struct task_struct *p)
if (task_node(p) != p->numa_preferred_nid)
numa_migrate_preferred(p);
}
update_task_scan_period(p, fault_types[0], fault_types[1]);
}
static inline int get_numa_group(struct numa_group *grp)