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sched/topology: Introduce SD metaflag for flags needing > 1 groups

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In preparation of cleaning up the sd_degenerate*() functions, mark flags
used in sd_degenerate() with the new SDF_NEEDS_GROUPS flag. With this,
build a compile-time mask of those SD flags.

Note that sd_parent_degenerate() uses an extra flag in its mask,
SD_PREFER_SIBLING, which remains singled out for now.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20200817113003.20802-8-valentin.schneider@arm.com
This commit is contained in:
Valentin Schneider
2020-08-17 12:29:53 +01:00
committed by Ingo Molnar
parent 5b9f8ff7b3
commit 4ee4ea443a
2 changed files with 35 additions and 11 deletions
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7
include/linux/sched/topology.h
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@@ -25,6 +25,13 @@ enum {
};
#undef SD_FLAG
/* Generate a mask of SD flags with the SDF_NEEDS_GROUPS metaflag */
#define SD_FLAG(name, mflags) (name * !!((mflags) & SDF_NEEDS_GROUPS)) |
static const unsigned int SD_DEGENERATE_GROUPS_MASK =
#include <linux/sched/sd_flags.h>
0;
#undef SD_FLAG
#ifdef CONFIG_SCHED_DEBUG
#define SD_FLAG(_name, mflags) [__##_name] = { .meta_flags = mflags, .name = #_name },
static const struct {