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sched_ext: Add SCX_EFLAG_INITIALIZED to indicate successful ops.init()

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ops.exit() may be called even if the loading failed before ops.init()
finishes successfully. This is because ops.exit() allows rich exit info
communication. Add SCX_EFLAG_INITIALIZED flag to scx_exit_info.flags to
indicate whether ops.init() finished successfully.

This enables BPF schedulers to distinguish between exit scenarios and
handle cleanup appropriately based on initialization state.

Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2025-09-23 09:03:26 -10:00
parent c7e739746d
commit f3aec2adce
2 changed files with 14 additions and 0 deletions
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1
kernel/sched/ext.c
View File

@ -4554,6 +4554,7 @@ static int scx_enable(struct sched_ext_ops *ops, struct bpf_link *link)
scx_error(sch, "ops.init() failed (%d)", ret); scx_error(sch, "ops.init() failed (%d)", ret);
goto err_disable; goto err_disable;
} }
sch->exit_info->flags |= SCX_EFLAG_INITIALIZED;
} }
for (i = SCX_OPI_CPU_HOTPLUG_BEGIN; i < SCX_OPI_CPU_HOTPLUG_END; i++) for (i = SCX_OPI_CPU_HOTPLUG_BEGIN; i < SCX_OPI_CPU_HOTPLUG_END; i++)

13
kernel/sched/ext_internal.h
View File

@ -62,6 +62,16 @@ enum scx_exit_code {
SCX_ECODE_ACT_RESTART = 1LLU << 48, SCX_ECODE_ACT_RESTART = 1LLU << 48,
}; };
enum scx_exit_flags {
/*
* ops.exit() may be called even if the loading failed before ops.init()
* finishes successfully. This is because ops.exit() allows rich exit
* info communication. The following flag indicates whether ops.init()
* finished successfully.
*/
SCX_EFLAG_INITIALIZED,
};
/* /*
* scx_exit_info is passed to ops.exit() to describe why the BPF scheduler is * scx_exit_info is passed to ops.exit() to describe why the BPF scheduler is
* being disabled. * being disabled.
@ -73,6 +83,9 @@ struct scx_exit_info {
/* exit code if gracefully exiting */ /* exit code if gracefully exiting */
s64 exit_code; s64 exit_code;
/* %SCX_EFLAG_* */
u64 flags;
/* textual representation of the above */ /* textual representation of the above */
const char *reason; const char *reason;