[linuxkernelnewbies] LKML: Jason Baron: [PATCH 0/2] perf_counter: add tracepoint support

[Peter Teoh]

http://lkml.org/lkml/2009/7/6/313 Date Mon, 6 Jul 2009 17:11:53 -0400 From Jason Baron <> Subject [PATCH 0/2] perf_counter: add tracepoint support hi, The following two patches build on Peter's initial tracepoint perf counter work. The first patches enables the kernel side, and the second patch adds support to the 'perf' tool itself. The debugfs filesystem needs to be mounted to make this work and it is searched in the default location '/sys/kernel/debug'. We can add an optional parameter to search for it elsewhere if need be. Below, I show the output of 'perf list', and 'perf stat' for a tbench run. thanks, -Jason > perf list List of pre-defined events (to be used in -e): cpu-cycles OR cycles [Hardware event] instructions [Hardware event] cache-references [Hardware event] cache-misses [Hardware event] branch-instructions OR branches [Hardware event] branch-misses [Hardware event] bus-cycles [Hardware event] cpu-clock [Software event] task-clock [Software event] page-faults OR faults [Software event] minor-faults [Software event] major-faults [Software event] context-switches OR cs [Software event] cpu-migrations OR migrations [Software event] L1-d$-loads [Hardware cache event] L1-d$-load-misses [Hardware cache event] L1-d$-stores [Hardware cache event] L1-d$-store-misses [Hardware cache event] L1-d$-prefetches [Hardware cache event] L1-d$-prefetch-misses [Hardware cache event] L1-i$-loads [Hardware cache event] L1-i$-load-misses [Hardware cache event] L1-i$-prefetches [Hardware cache event] L1-i$-prefetch-misses [Hardware cache event] LLC-loads [Hardware cache event] LLC-load-misses [Hardware cache event] LLC-stores [Hardware cache event] LLC-store-misses [Hardware cache event] LLC-prefetches [Hardware cache event] LLC-prefetch-misses [Hardware cache event] dTLB-loads [Hardware cache event] dTLB-load-misses [Hardware cache event] dTLB-stores [Hardware cache event] dTLB-store-misses [Hardware cache event] dTLB-prefetches [Hardware cache event] dTLB-prefetch-misses [Hardware cache event] iTLB-loads [Hardware cache event] iTLB-load-misses [Hardware cache event] branch-loads [Hardware cache event] branch-load-misses [Hardware cache event] rNNN [raw hardware event descriptor] skb:kfree_skb [Tracepoint event] block:block_rq_abort [Tracepoint event] block:block_rq_insert [Tracepoint event] block:block_rq_issue [Tracepoint event] block:block_rq_requeue [Tracepoint event] block:block_rq_complete [Tracepoint event] block:block_bio_bounce [Tracepoint event] block:block_bio_complete [Tracepoint event] block:block_bio_backmerge [Tracepoint event] block:block_bio_frontmerge [Tracepoint event] block:block_bio_queue [Tracepoint event] block:block_getrq [Tracepoint event] block:block_sleeprq [Tracepoint event] block:block_plug [Tracepoint event] block:block_unplug_timer [Tracepoint event] block:block_unplug_io [Tracepoint event] block:block_split [Tracepoint event] block:block_remap [Tracepoint event] kmem:kmalloc [Tracepoint event] kmem:kmem_cache_alloc [Tracepoint event] kmem:kmalloc_node [Tracepoint event] kmem:kmem_cache_alloc_node [Tracepoint event] kmem:kfree [Tracepoint event] kmem:kmem_cache_free [Tracepoint event] ftrace:kmem_free [Tracepoint event] ftrace:kmem_alloc [Tracepoint event] ftrace:power [Tracepoint event] ftrace:hw_branch [Tracepoint event] ftrace:branch [Tracepoint event] ftrace:print [Tracepoint event] ftrace:bprint [Tracepoint event] ftrace:user_stack [Tracepoint event] ftrace:kernel_stack [Tracepoint event] ftrace:special [Tracepoint event] ftrace:context_switch [Tracepoint event] ftrace:wakeup [Tracepoint event] ftrace:funcgraph_exit [Tracepoint event] ftrace:funcgraph_entry [Tracepoint event] ftrace:function [Tracepoint event] workqueue:workqueue_insertion [Tracepoint event] workqueue:workqueue_execution [Tracepoint event] workqueue:workqueue_creation [Tracepoint event] workqueue:workqueue_destruction [Tracepoint event] irq:irq_handler_entry [Tracepoint event] irq:irq_handler_exit [Tracepoint event] irq:softirq_entry [Tracepoint event] irq:softirq_exit [Tracepoint event] sched:sched_kthread_stop [Tracepoint event] sched:sched_kthread_stop_ret [Tracepoint event] sched:sched_wait_task [Tracepoint event] sched:sched_wakeup [Tracepoint event] sched:sched_wakeup_new [Tracepoint event] sched:sched_switch [Tracepoint event] sched:sched_migrate_task [Tracepoint event] sched:sched_process_free [Tracepoint event] sched:sched_process_exit [Tracepoint event] sched:sched_process_wait [Tracepoint event] sched:sched_process_fork [Tracepoint event] sched:sched_signal_send [Tracepoint event] > perf stat -a -e sched:sched_switch -e sched:sched_wakeup -e irq:irq_handler_entry tbench 4 Performance counter stats for 'tbench 4': 194658693 sched:sched_switch 97479295 sched:sched_wakeup 9122 irq:irq_handler_entry 720.171439729 seconds time elapsed -add kernel tracepoint support -add support for tracepoints to the perf tool init/Kconfig | 2 +- kernel/perf_counter.c | 6 +- tools/perf/util/parse-events.c | 195 +++++++++++++++++++++++++++++++++++++++- tools/perf/util/util.h | 2 + 4 files changed, 200 insertions(+), 5 deletions(-)