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authorBorislav Petkov <borislav.petkov@amd.com>2011-10-16 17:15:04 +0200
committerIngo Molnar <mingo@elte.hu>2011-11-14 13:31:26 +0100
commit9251f904f95175b4a1d8cbc0449e748f9edd7629 (patch)
tree585b73028c0c6b955d1759faf8544870eae213f5 /kernel/events/internal.h
parentefc96737bd82b508794d2b28061a12af4a3f7766 (diff)
downloadvexpress-lsk-9251f904f95175b4a1d8cbc0449e748f9edd7629.tar.gz
perf: Carve out callchain functionality
Split the callchain code from the perf events core into a new kernel/events/callchain.c file. This simplifies a bit the big core.c Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Stephane Eranian <eranian@google.com> [keep ctx recursion handling inline and use internal headers] Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1318778104-17152-1-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/events/internal.h')
-rw-r--r--kernel/events/internal.h39
1 files changed, 38 insertions, 1 deletions
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 09097dd8116..be4a43f6de4 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -1,6 +1,10 @@
#ifndef _KERNEL_EVENTS_INTERNAL_H
#define _KERNEL_EVENTS_INTERNAL_H
+#include <linux/hardirq.h>
+
+/* Buffer handling */
+
#define RING_BUFFER_WRITABLE 0x01
struct ring_buffer {
@@ -64,7 +68,7 @@ static inline int page_order(struct ring_buffer *rb)
}
#endif
-static unsigned long perf_data_size(struct ring_buffer *rb)
+static inline unsigned long perf_data_size(struct ring_buffer *rb)
{
return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
}
@@ -93,4 +97,37 @@ __output_copy(struct perf_output_handle *handle,
} while (len);
}
+/* Callchain handling */
+extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
+extern int get_callchain_buffers(void);
+extern void put_callchain_buffers(void);
+
+static inline int get_recursion_context(int *recursion)
+{
+ int rctx;
+
+ if (in_nmi())
+ rctx = 3;
+ else if (in_irq())
+ rctx = 2;
+ else if (in_softirq())
+ rctx = 1;
+ else
+ rctx = 0;
+
+ if (recursion[rctx])
+ return -1;
+
+ recursion[rctx]++;
+ barrier();
+
+ return rctx;
+}
+
+static inline void put_recursion_context(int *recursion, int rctx)
+{
+ barrier();
+ recursion[rctx]--;
+}
+
#endif /* _KERNEL_EVENTS_INTERNAL_H */