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Message-ID: <20241025054014.66631-1-void@manifault.com>
Date: Fri, 25 Oct 2024 00:40:13 -0500
From: David Vernet <void@...ifault.com>
To: tj@...nel.org
Cc: sched-ext@...a.com,
kernel-team@...a.com,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] scx: Fix exit selftest to use custom DSQ
In commit 63fb3ec80516 ("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@...tme-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@...ifault.com>
---
Applied on top of 4f7f417042b242c1e5a9ed03741acb5d900e0871 on the
for-6.12-fixes branch
tools/testing/selftests/sched_ext/exit.bpf.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/sched_ext/exit.bpf.c b/tools/testing/selftests/sched_ext/exit.bpf.c
index bf79ccd55f8f..d75d4faf07f6 100644
--- a/tools/testing/selftests/sched_ext/exit.bpf.c
+++ b/tools/testing/selftests/sched_ext/exit.bpf.c
@@ -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")
--
2.46.1
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