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authorStephen Wadeley <swadeley@redhat.com>2013-06-11 17:13:33 +0200
committerDaniel Borkmann <dborkman@redhat.com>2013-06-11 23:18:02 +0200
commit397483d79b222be420b7dc934e7751bb9d1829a6 (patch)
treed11fd32ec650c43e7ecd3997dc63da544853e9e4 /bpf_comp.c
parentf1e8419d9f5cf87570938fe5f4aafeb0e646478a (diff)
man: improvements to language for astraceroute.8
Signed-off-by: Stephen Wadeley <swadeley@redhat.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Diffstat (limited to 'bpf_comp.c')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-10-05 13:03:55 +0000
detach_entity_load_avg() set_task_rq() attach_task_cfs_rq() attach_entity_load_avg() if (queued) enqueue_task(); ... enqueue_entity() enqueue_entity_load_avg() migrated = !sa->last_update_time (true) if (migrated) attach_entity_load_avg() Similar as with scenario 1, if @p is a new task, it will have !load_update_time and we'll end up in attach_entity_load_avg() _twice_. Furthermore, notice how we do a detach_entity_load_avg() on something that wasn't attached to begin with. As stated above; the problem is that the new task isn't yet attached to the load tracking and thereby violates the invariant assumption. This patch remedies this by ensuring a new task is indeed properly attached to the load tracking on creation, through post_init_entity_util_avg(). Of course, this isn't entirely as straightforward as one might think, since the task is hashed before we call wake_up_new_task() and thus can be poked at. We avoid this by adding TASK_NEW and teaching cpu_cgroup_can_attach() to refuse such tasks. Reported-by: Yuyang Du <yuyang.du@intel.com> Reported-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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