Messages in this thread Patch in this message | | | Date | Thu, 9 Sep 2004 10:19:54 -0700 | From | William Lee Irwin III <> | Subject | Re: [PATCH][5/8] Arch agnostic completely out of line locks / ppc64 |
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At some point in the past, Zwane Mwaikambo wrote: >> I think that bit is actually intentional since __preempt_spin_lock is also >> marked __sched so that it'll get charged as a scheduling function.
On Fri, Sep 10, 2004 at 01:43:00AM +1000, Anton Blanchard wrote: > Yeah, its a bit unfortunate. In profiles with preempt on we end up with > almost all our ticks inside __preempt_spin_lock and never get to use the > nice profile_pc code. I ended up turning preempt off again.
Checking in_lock_functions() (not sure what the name in Zwane's code was) for non-leaf functions in get_wchan() in addition to in_sched_functions() should do. e.g.
Index: mm4-2.6.9-rc1/arch/ppc64/kernel/process.c =================================================================== --- mm4-2.6.9-rc1.orig/arch/ppc64/kernel/process.c 2004-09-08 05:46:09.000000000 -0700 +++ mm4-2.6.9-rc1/arch/ppc64/kernel/process.c 2004-09-09 09:58:47.448326528 -0700 @@ -555,7 +555,8 @@ return 0; if (count > 0) { ip = *(unsigned long *)(sp + 16); - if (!in_sched_functions(ip)) + if (!in_sched_functions(ip) && + || (!count || !in_lock_functions(ip))) return ip; } } while (count++ < 16); Index: mm4-2.6.9-rc1/include/linux/spinlock.h =================================================================== --- mm4-2.6.9-rc1.orig/include/linux/spinlock.h 2004-09-08 05:46:18.000000000 -0700 +++ mm4-2.6.9-rc1/include/linux/spinlock.h 2004-09-09 09:57:33.529563888 -0700 @@ -46,6 +46,7 @@ #define __lockfunc fastcall __attribute__((section(".lock.text"))) +int in_lock_functions(unsigned long); int __lockfunc _spin_trylock(spinlock_t *lock); int __lockfunc _write_trylock(rwlock_t *lock); void __lockfunc _spin_lock(spinlock_t *lock); Index: mm4-2.6.9-rc1/kernel/spinlock.c =================================================================== --- mm4-2.6.9-rc1.orig/kernel/spinlock.c 2004-09-08 05:46:04.000000000 -0700 +++ mm4-2.6.9-rc1/kernel/spinlock.c 2004-09-09 09:57:10.569054416 -0700 @@ -11,6 +11,12 @@ #include <linux/interrupt.h> #include <linux/module.h> +int in_lock_functions(unsigned long vaddr) +{ + return vaddr >= (unsigned long)&__lock_text_start + && vaddr < (unsigned long)&__lock_text_end; +} + int __lockfunc _spin_trylock(spinlock_t *lock) { preempt_disable(); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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