tools/sched_ext: scx_qmap - Add init fault injection modes

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Add -J init-fail which makes ops.init_task() fail with -ENOMEM for tasks
whose comm starts with "qmfail", and -J cgrp-init-fail which does the same
in ops.cgroup_init() for cgroups named "qmfail*".

The former exercises the migration veto path: the cgroup.procs write must
fail with the injected errno while the destination sched stays up and the
task stays put. The latter exercises the ownership-return failure path: a
parent failing to re-init a returned cgroup leaves it unowned, and moves and
set_* ops against it must be skipped instead of dereferencing the missing
owner. Matching on "qmfail" names keeps the injecting scheduler's own enable
unaffected.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>

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This commit is contained in:

Tejun Heo 2026-07-17 22:12:20 -10:00

parent 29ac3ae9ab

commit 01cad83043

3 changed files with 24 additions and 1 deletions

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15

tools/sched_ext/scx_qmap.bpf.c

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tools/sched_ext/scx_qmap.c

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2

tools/sched_ext/scx_qmap.h

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