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scx: Fix exit selftest to use custom DSQ

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In commit 63fb3ec805 ("sched_ext: Allow only user DSQs for
scx_bpf_consume(), scx_bpf_dsq_nr_queued() and bpf_iter_scx_dsq_new()"), we
updated the consume path to only accept user DSQs, thus making it invalid
to consume SCX_DSQ_GLOBAL. This selftest was doing that, so let's create a
custom DSQ and use that instead.  The test now passes:

[root@virtme-ng sched_ext]# ./runner -t exit
===== START =====
TEST: exit
DESCRIPTION: Verify we can cleanly exit a scheduler in multiple places
OUTPUT:
[   12.387229] sched_ext: BPF scheduler "exit" enabled
[   12.406064] sched_ext: BPF scheduler "exit" disabled (unregistered from BPF)
[   12.453325] sched_ext: BPF scheduler "exit" enabled
[   12.474064] sched_ext: BPF scheduler "exit" disabled (unregistered from BPF)
[   12.515241] sched_ext: BPF scheduler "exit" enabled
[   12.532064] sched_ext: BPF scheduler "exit" disabled (unregistered from BPF)
[   12.592063] sched_ext: BPF scheduler "exit" disabled (unregistered from BPF)
[   12.654063] sched_ext: BPF scheduler "exit" disabled (unregistered from BPF)
[   12.715062] sched_ext: BPF scheduler "exit" disabled (unregistered from BPF)
ok 1 exit #
=====  END  =====

Signed-off-by: David Vernet <void@manifault.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
David Vernet 2024-10-25 00:40:13 -05:00 committed by Tejun Heo
parent 4f7f417042
commit 895669fd0d
1 changed files with 5 additions and 3 deletions
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8
tools/testing/selftests/sched_ext/exit.bpf.c
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@ -15,6 +15,8 @@ UEI_DEFINE(uei);
#define EXIT_CLEANLY() scx_bpf_exit(exit_point, "%d", exit_point)
#define DSQ_ID 0
s32 BPF_STRUCT_OPS(exit_select_cpu, struct task_struct *p,
s32 prev_cpu, u64 wake_flags)
{
@ -31,7 +33,7 @@ void BPF_STRUCT_OPS(exit_enqueue, struct task_struct *p, u64 enq_flags)
if (exit_point == EXIT_ENQUEUE)
EXIT_CLEANLY();
scx_bpf_dispatch(p, SCX_DSQ_GLOBAL, SCX_SLICE_DFL, enq_flags);
scx_bpf_dispatch(p, DSQ_ID, SCX_SLICE_DFL, enq_flags);
}
void BPF_STRUCT_OPS(exit_dispatch, s32 cpu, struct task_struct *p)
@ -39,7 +41,7 @@ void BPF_STRUCT_OPS(exit_dispatch, s32 cpu, struct task_struct *p)
if (exit_point == EXIT_DISPATCH)
EXIT_CLEANLY();
scx_bpf_consume(SCX_DSQ_GLOBAL);
scx_bpf_consume(DSQ_ID);
}
void BPF_STRUCT_OPS(exit_enable, struct task_struct *p)
@ -67,7 +69,7 @@ s32 BPF_STRUCT_OPS_SLEEPABLE(exit_init)
if (exit_point == EXIT_INIT)
EXIT_CLEANLY();
return 0;
return scx_bpf_create_dsq(DSQ_ID, -1);
}
SEC(".struct_ops.link")