Re: [tip:sched/core] sched: Check for an idle shared cache in select_task_rq_fair()

Ingo Molnar
2009-11-05T09:31:05Z

* tip-bot for Mike Galbraith <efault@gmx.de> wrote:

> Commit-ID: a1f84a3ab8e002159498814eaa7e48c33752b04b
> Gitweb: http://git.kernel.org/tip/a1f84a3ab8e002159498814eaa7e48c33752b04b
> Author: Mike Galbraith <efault@gmx.de>
> AuthorDate: Tue, 27 Oct 2009 15:35:38 +0100
> Committer: Ingo Molnar <mingo@elte.hu>
> CommitDate: Wed, 4 Nov 2009 18:46:22 +0100
>
> sched: Check for an idle shared cache in select_task_rq_fair()

-tip testing found that this causes problems:

[ 26.804000] BUG: using smp_processor_id() in preemptible [00000000] code: events/1/10
[ 26.808000] caller is vmstat_update+0x26/0x70
[ 26.812000] Pid: 10, comm: events/1 Not tainted 2.6.32-rc5 #6887
[ 26.816000] Call Trace:
[ 26.820000] [<c1924a24>] ? printk+0x28/0x3c
[ 26.824000] [<c13258a0>] debug_smp_processor_id+0xf0/0x110
[ 26.824000] mount used greatest stack depth: 1464 bytes left
[ 26.828000] [<c111d086>] vmstat_update+0x26/0x70
[ 26.832000] [<c1086418>] worker_thread+0x188/0x310
[ 26.836000] [<c10863b7>] ? worker_thread+0x127/0x310
[ 26.840000] [<c108d310>] ? autoremove_wake_function+0x0/0x60
[ 26.844000] [<c1086290>] ? worker_thread+0x0/0x310
[ 26.848000] [<c108cf0c>] kthread+0x7c/0x90
[ 26.852000] [<c108ce90>] ? kthread+0x0/0x90
[ 26.856000] [<c100c0a7>] kernel_thread_helper+0x7/0x10
[ 26.860000] BUG: using smp_processor_id() in preemptible [00000000] code: events/1/10
[ 26.864000] caller is vmstat_update+0x3c/0x70

oh ... doesnt it break cpus_allowed?

Ingo