Commit 9c03d88e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf_counter: add more context information 



Change the callchain context entries to u16, so as to gain some space.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090406094517.457320003@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a2e87d06

include/linux/perf_counter.h

+2 −2
Original line number Diff line number Diff line
@@ -507,10 +507,10 @@ extern void perf_counter_mmap(unsigned long addr, unsigned long len, 
extern void perf_counter_munmap(unsigned long addr, unsigned long len,

				unsigned long pgoff, struct file *file);



#define MAX_STACK_DEPTH		254

#define MAX_STACK_DEPTH		255



struct perf_callchain_entry {

	u32	nr, hv, kernel, user;

	u16	nr, hv, kernel, user;

	u64	ip[MAX_STACK_DEPTH];

};

kernel/perf_counter.c

+2 −4
Original line number Diff line number Diff line
@@ -1657,9 +1657,7 @@ void perf_counter_do_pending(void) 
 * Callchain support -- arch specific

 */



struct perf_callchain_entry *

__attribute__((weak))

perf_callchain(struct pt_regs *regs)

__weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)

{

	return NULL;

}
@@ -1819,7 +1817,7 @@ void perf_counter_output(struct perf_counter *counter, 
		callchain = perf_callchain(regs);



		if (callchain) {

			callchain_size = (2 + callchain->nr) * sizeof(u64);

			callchain_size = (1 + callchain->nr) * sizeof(u64);



			header.type |= __PERF_EVENT_CALLCHAIN;

			header.size += callchain_size;

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