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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-05-23 18:28:55 +0200
committerIngo Molnar <mingo@elte.hu>2009-05-23 19:37:44 +0200
commite220d2dcb944c5c488b6855d15ec66d76900514f (patch)
treebbaa8ead4276d59d6d73d49a28fd6e1e1ed3259a /kernel/perf_counter.c
parentc6eb13847ba081552d2af644219bddeff7110caf (diff)
downloadlwn-e220d2dcb944c5c488b6855d15ec66d76900514f.tar.gz
lwn-e220d2dcb944c5c488b6855d15ec66d76900514f.zip
perf_counter: Fix dynamic irq_period logging
We call perf_adjust_freq() from perf_counter_task_tick() which is is called under the rq->lock causing lock recursion. However, it's no longer required to be called under the rq->lock, so remove it from under it. Also, fix up some related comments. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: John Kacur <jkacur@redhat.com> LKML-Reference: <20090523163012.476197912@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_counter.c')
-rw-r--r--kernel/perf_counter.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index c10055416dea..2f410ea2cb39 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2559,7 +2559,8 @@ void perf_counter_munmap(unsigned long addr, unsigned long len,
}
/*
- *
+ * Log irq_period changes so that analyzing tools can re-normalize the
+ * event flow.
*/
static void perf_log_period(struct perf_counter *counter, u64 period)