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authorFrederic Weisbecker <fweisbec@gmail.com>2009-12-31 05:53:02 +0100
committerIngo Molnar <mingo@elte.hu>2009-12-31 13:11:31 +0100
commit48b5ba9cc98d676712da29d9931f1c88e5185ff2 (patch)
tree6961114f04455c1da1d32212d6258bc75f362bfd /arch
parent4efb5290ae187514bd31af8c2d7755e175245e19 (diff)
downloadop-kernel-dev-48b5ba9cc98d676712da29d9931f1c88e5185ff2.zip
op-kernel-dev-48b5ba9cc98d676712da29d9931f1c88e5185ff2.tar.gz
perf: Pass appropriate frame pointer to dump_trace()
Pass the frame pointer from the regs of the interrupted path to dump_trace() while processing the stack trace. Currently, dump_trace() takes the current bp and starts the callchain from dump_trace() itself. This is wasteful because we need to walk through the entire NMI/DEBUG stack before retrieving the interrupted point. We can fix that by just using the frame pointer from the captured regs. It points exactly where we want to start. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1262235183-5320-1-git-send-regression-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/perf_event.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index c223b7e..d616c06 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -2347,7 +2347,7 @@ perf_callchain_kernel(struct pt_regs *regs, struct perf_callchain_entry *entry)
callchain_store(entry, PERF_CONTEXT_KERNEL);
callchain_store(entry, regs->ip);
- dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry);
+ dump_trace(NULL, regs, NULL, regs->bp, &backtrace_ops, entry);
}
/*
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