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Message-ID: <20090827164007.GA30679@elte.hu>
Date: Thu, 27 Aug 2009 18:40:07 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Gregory Haskins <gregory.haskins@...il.com>,
Frédéric Weisbecker
<fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: FTRACE: regression in 31-rc7
* Gregory Haskins <gregory.haskins@...il.com> wrote:
> Hi Steve,
>
> I just moved from -rc6 to -rc7, and I noticed that the
> function-graph tracer suddenly stopped working properly: I do not
> see any output from seeming most things except a handful of
> interrupt related events. I currently believe it may be an issue
> with tracing modules.
>
> I haven't had a chance to bisect yet, but I did confirm that
> reverting the -rc7 merge restores the previous tracer behavior.
> Any help/pointers appreciated.
Works fine here (using -rc7 based -tip):
11) | sys_munmap() {
11) | profile_munmap() {
11) | blocking_notifier_call_chain() {
11) 0.170 us | __blocking_notifier_call_chain();
11) 0.480 us | }
11) 0.799 us | }
11) | down_write() {
11) 0.146 us | _cond_resched();
11) 0.146 us | _spin_lock_irq();
11) 0.754 us | }
11) | do_munmap() {
11) 0.144 us | test_ti_thread_flag();
11) 0.144 us | test_ti_thread_flag();
11) 0.164 us | find_vma();
11) 0.156 us | arch_unmap_area_topdown();
11) | unmap_region() {
11) | lru_add_drain() {
11) | ____pagevec_lru_add() {
11) 0.153 us | _spin_lock_irq();
11) 0.145 us | __inc_zone_state();
11) | __inc_zone_state() {
11) 0.144 us | __inc_zone_state();
11) 0.146 us | __inc_zone_state();
11) 0.145 us | __inc_zone_state();
11) 0.223 us | release_pages();
11) 2.463 us | }
11) 2.795 us | }
11) | unmap_vmas() {
11) | unmap_page_range() {
11) 0.144 us | pgd_none_or_clear_bad();
11) 0.145 us | pud_none_or_clear_bad();
11) 0.154 us | pmd_none_or_clear_bad();
11) | zap_pte_range() {
11) 0.145 us | _spin_lock();
11) 0.168 us | vm_normal_page();
11) 0.143 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.150 us | __dec_zone_state();
11) 0.441 us | }
11) 0.748 us | }
11) 0.149 us | vm_normal_page();
11) 0.146 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.148 us | __dec_zone_state();
11) 0.439 us | }
11) 0.748 us | }
11) 0.144 us | vm_normal_page();
11) 0.148 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.148 us | __dec_zone_state();
11) 0.438 us | }
11) 0.731 us | }
11) 0.144 us | vm_normal_page();
11) 0.146 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.146 us | __dec_zone_state();
11) 0.437 us | }
11) 0.733 us | }
11) 0.143 us | vm_normal_page();
11) 0.148 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.147 us | __dec_zone_state();
11) 0.438 us | }
11) 0.731 us | }
11) 0.144 us | vm_normal_page();
11) 0.146 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.146 us | __dec_zone_state();
11) 0.436 us | }
11) 0.732 us | }
11) 0.143 us | vm_normal_page();
11) 0.146 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.147 us | __dec_zone_state();
11) 0.435 us | }
11) 0.751 us | }
11) 0.142 us | vm_normal_page();
11) 0.146 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.146 us | __dec_zone_state();
11) 0.438 us | }
11) 0.733 us | }
11) 0.143 us | vm_normal_page();
11) 0.145 us | mark_page_accessed();
11) | page_remove_rmap() {
11) | __dec_zone_page_state() {
11) 0.145 us | __dec_zone_state();
11) 0.434 us | }
11) 0.731 us | }
11) + 14.220 us | }
11) + 15.442 us | }
11) + 15.750 us | }
11) | free_pgtables() {
so it would be nice if you sent a config and a precise description
of what you did to see the weirdness - in case others have trouble
reproducing it as well.
Ingo
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