From f9188e023c248d73f5b4a589b480e065c1864068 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 18 Jun 2009 22:20:52 +0200 Subject: perf_counter: Make callchain samples extensible Before exposing upstream tools to a callchain-samples ABI, tidy it up to make it more extensible in the future: Use markers in the IP chain to denote context, use (u64)-1..-4095 range for these context markers because we use them for ERR_PTR(), so these addresses are unlikely to be mapped. Signed-off-by: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo LKML-Reference: Signed-off-by: Ingo Molnar --- include/linux/perf_counter.h | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) (limited to 'include/linux/perf_counter.h') diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 0765e8e69843..e7e7e0242767 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -343,23 +343,22 @@ enum perf_event_type { * { u64 nr; * { u64 id, val; } cnt[nr]; } && PERF_SAMPLE_GROUP * - * { u16 nr, - * hv, - * kernel, - * user; + * { u64 nr, * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN * }; */ }; -#define MAX_STACK_DEPTH 255 +enum perf_callchain_context { + PERF_CONTEXT_HV = (__u64)-32, + PERF_CONTEXT_KERNEL = (__u64)-128, + PERF_CONTEXT_USER = (__u64)-512, -struct perf_callchain_entry { - __u16 nr; - __u16 hv; - __u16 kernel; - __u16 user; - __u64 ip[MAX_STACK_DEPTH]; + PERF_CONTEXT_GUEST = (__u64)-2048, + PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176, + PERF_CONTEXT_GUEST_USER = (__u64)-2560, + + PERF_CONTEXT_MAX = (__u64)-4095, }; #ifdef __KERNEL__ @@ -381,6 +380,13 @@ struct perf_callchain_entry { #include #include +#define PERF_MAX_STACK_DEPTH 255 + +struct perf_callchain_entry { + __u64 nr; + __u64 ip[PERF_MAX_STACK_DEPTH]; +}; + struct task_struct; /** -- cgit v1.2.3