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authorArnaldo Carvalho de Melo <acme@redhat.com>2016-05-10 18:08:32 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-05-16 23:11:51 -0300
commit3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0 (patch)
tree894e513ec904c0b4249917b64adac9d5bda162b5 /arch/sparc
parentcfbcf468454ab4b20f0b4b62da51920b99fdb19e (diff)
downloadlinux-3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0.tar.gz
perf core: Add a 'nr' field to perf_event_callchain_context
We will use it to count how many addresses are in the entry->ip[] array, excluding PERF_CONTEXT_{KERNEL,USER,etc} entries, so that we can really return the number of entries specified by the user via the relevant sysctl, kernel.perf_event_max_contexts, or via the per event perf_event_attr.sample_max_stack knob. This way we keep the perf_sample->ip_callchain->nr meaning, that is the number of entries, be it real addresses or PERF_CONTEXT_ entries, while honouring the max_stack knobs, i.e. the end result will be max_stack entries if we have at least that many entries in a given stack trace. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-s8teto51tdqvlfhefndtat9r@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/kernel/perf_event.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index bcc5376db74b..710f3278d448 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1756,7 +1756,7 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
}
}
#endif
- } while (entry->entry->nr < entry->max_stack);
+ } while (entry->nr < entry->max_stack);
}
static inline int
@@ -1790,7 +1790,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry,
pc = sf.callers_pc;
ufp = (unsigned long)sf.fp + STACK_BIAS;
perf_callchain_store(entry, pc);
- } while (entry->entry->nr < entry->max_stack);
+ } while (entry->nr < entry->max_stack);
}
static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
@@ -1822,7 +1822,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry_ctx *entry,
ufp = (unsigned long)sf.fp;
}
perf_callchain_store(entry, pc);
- } while (entry->entry->nr < entry->max_stack);
+ } while (entry->nr < entry->max_stack);
}
void