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sched_ext: Take out ->priq and ->flags from scx_dsq_node

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struct scx_dsq_node contains two data structure nodes to link the containing
task to a DSQ and a flags field that is protected by the lock of the
associated DSQ. One reason why they are grouped into a struct is to use the
type independently as a cursor node when iterating tasks on a DSQ. However,
when iterating, the cursor only needs to be linked on the FIFO list and the
rb_node part ends up inflating the size of the iterator data structure
unnecessarily making it potentially too expensive to place it on stack.

Take ->priq and ->flags out of scx_dsq_node and put them in sched_ext_entity
as ->dsq_priq and ->dsq_flags, respectively. scx_dsq_node is renamed to
scx_dsq_list_node and the field names are renamed accordingly. This will
help implementing DSQ task iterator that can be allocated on stack.

No functional change intended.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: David Vernet <void@manifault.com>
This commit is contained in:
Tejun Heo
2024-07-08 14:30:55 -10:00
parent e196c908f9
commit d4af01c373
3 changed files with 33 additions and 33 deletions
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2
init/init_task.c
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@@ -102,7 +102,7 @@ struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
#endif
#ifdef CONFIG_SCHED_CLASS_EXT
.scx = {
.dsq_node.list = LIST_HEAD_INIT(init_task.scx.dsq_node.list),
.dsq_list.node = LIST_HEAD_INIT(init_task.scx.dsq_list.node),
.sticky_cpu = -1,
.holding_cpu = -1,
.runnable_node = LIST_HEAD_INIT(init_task.scx.runnable_node),