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Groups > linux.kernel > #1645423
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] lockdep: do not count lock class operations without CONFIG_DEBUG_LOCKDEP |
| Date | 2017-05-19 11:10 +0200 |
| Message-ID | <tIM55-8nS-39@gated-at.bofh.it> (permalink) |
| References | <tIKcW-76X-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, May 19, 2017 at 10:06:01AM +0300, Konstantin Khlebnikov wrote: > Currently this counter shown in /proc/lockdep if CONFIG_DEBUG_LOCKDEP=y > This patch disables it completely if this option is disabled. > > This counter might be useful for debugging lockdep itself, but for normal > debugging it seems useless. Lockstat provides more detailed statistics. > > This atomic_inc is a hot spot inside __lock_acquire() for debug kernel. > > With patch "netperf -H localhost" shows some boost: 2500 -> 2600 Nothing against these patches, but I do wonder why you're performance optimizing debug kernels ;-)
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[PATCH] lockdep: do not count lock class operations without CONFIG_DEBUG_LOCKDEP Konstantin Khlebnikov <khlebnikov@yandex-team.ru> - 2017-05-19 09:10 +0200
Re: [PATCH] lockdep: do not count lock class operations without CONFIG_DEBUG_LOCKDEP Peter Zijlstra <peterz@infradead.org> - 2017-05-19 11:10 +0200
Re: [PATCH] lockdep: do not count lock class operations without CONFIG_DEBUG_LOCKDEP Konstantin Khlebnikov <khlebnikov@yandex-team.ru> - 2017-05-19 11:30 +0200
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