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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-06-19 13:22:51 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-19 13:43:12 +0200
commite5289d4a181fb6c0b7a7607649af2ffdc491335c (patch)
tree6c9e9ab46a29c538e4c505d3d3cd135265db08a2 /include
parentperf_counter tools: Add a data file header (diff)
downloadlinux-e5289d4a181fb6c0b7a7607649af2ffdc491335c.tar.xz
linux-e5289d4a181fb6c0b7a7607649af2ffdc491335c.zip
perf_counter: Simplify and fix task migration counting
The task migrations counter was causing rare and hard to decypher memory corruptions under load. After a day of debugging and bisection we found that the problem was introduced with: 3f731ca: perf_counter: Fix cpu migration counter Turning them off fixes the crashes. Incidentally, the whole perf_counter_task_migration() logic can be done simpler as well, by injecting a proper sw-counter event. This cleanup also fixed the crashes. The precise failure mode is not completely clear yet, but we are clearly not unhappy about having a fix ;-) Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
-rw-r--r--include/linux/perf_counter.h4
1 files changed, 0 insertions, 4 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index e7e7e0242767..89698d8aba5c 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -682,8 +682,6 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma)
extern void perf_counter_comm(struct task_struct *tsk);
extern void perf_counter_fork(struct task_struct *tsk);
-extern void perf_counter_task_migration(struct task_struct *task, int cpu);
-
extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
extern int sysctl_perf_counter_paranoid;
@@ -724,8 +722,6 @@ static inline void perf_counter_mmap(struct vm_area_struct *vma) { }
static inline void perf_counter_comm(struct task_struct *tsk) { }
static inline void perf_counter_fork(struct task_struct *tsk) { }
static inline void perf_counter_init(void) { }
-static inline void perf_counter_task_migration(struct task_struct *task,
- int cpu) { }
#endif
#endif /* __KERNEL__ */