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tracing/mm: don't trace mm_page_free on offline cpus

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Since tracepoints use RCU for protection, they must not be called on
offline cpus.  trace_mm_page_free can be called on an offline cpu in this
scenario caught by LOCKDEP:

     ===============================
     [ INFO: suspicious RCU usage. ]
     4.1.0-rc1+ #9 Not tainted
     -------------------------------
     include/trace/events/kmem.h:170 suspicious rcu_dereference_check() usage!

    other info that might help us debug this:

    RCU used illegally from offline CPU!
    rcu_scheduler_active = 1, debug_locks = 1
     no locks held by swapper/1/0.

    stack backtrace:
     CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.1.0-rc1+ #9
     Call Trace:
       .dump_stack+0x98/0xd4 (unreliable)
       .lockdep_rcu_suspicious+0x108/0x170
       .free_pages_prepare+0x494/0x680
       .free_hot_cold_page+0x50/0x280
       .destroy_context+0x90/0xd0
       .__mmdrop+0x58/0x160
       .idle_task_exit+0xf0/0x100
       .pnv_smp_cpu_kill_self+0x58/0x2c0
       .cpu_die+0x34/0x50
       .arch_cpu_idle_dead+0x20/0x40
       .cpu_startup_entry+0x708/0x7a0
       .start_secondary+0x36c/0x3a0
       start_secondary_prolog+0x10/0x14

Fix this by converting mm_page_free trace point into TRACE_EVENT_CONDITION
where condition is cpu_online(smp_processor_id())

Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shreyas B. Prabhu 2015-05-28 15:44:19 -07:00 committed by Linus Torvalds
parent e5feb1ebaa
commit 1f0c27b50f
1 changed files with 13 additions and 1 deletions
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14
include/trace/events/kmem.h
View file

@ -158,12 +158,24 @@ DEFINE_EVENT_CONDITION(kmem_free, kmem_cache_free,
TP_CONDITION(cpu_online(raw_smp_processor_id()))
);
TRACE_EVENT(mm_page_free,
TRACE_EVENT_CONDITION(mm_page_free,
TP_PROTO(struct page *page, unsigned int order),
TP_ARGS(page, order),
/*
* This trace can be potentially called from an offlined cpu.
* Since trace points use RCU and RCU should not be used from
* offline cpus, filter such calls out.
* While this trace can be called from a preemptable section,
* it has no impact on the condition since tasks can migrate
* only from online cpus to other online cpus. Thus its safe
* to use raw_smp_processor_id.
*/
TP_CONDITION(cpu_online(raw_smp_processor_id())),
TP_STRUCT__entry(
__field( unsigned long, pfn )
__field( unsigned int, order )