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perf: Humanize the number of contexts

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Instead of hardcoding the number of contexts for the recursions
barriers, define a cpp constant to make the code more
self-explanatory.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
This commit is contained in:
Frederic Weisbecker
2010-08-14 20:45:13 +02:00
parent 927c7a9e92
commit 7ae07ea3a4
3 changed files with 14 additions and 12 deletions
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4
kernel/perf_event.c
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@@ -1772,7 +1772,7 @@ struct callchain_cpus_entries {
struct perf_callchain_entry *cpu_entries[0];
};
static DEFINE_PER_CPU(int, callchain_recursion[4]);
static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]);
static atomic_t nr_callchain_events;
static DEFINE_MUTEX(callchain_mutex);
struct callchain_cpus_entries *callchain_cpus_entries;
@@ -1828,7 +1828,7 @@ static int alloc_callchain_buffers(void)
if (!entries)
return -ENOMEM;
size = sizeof(struct perf_callchain_entry) * 4;
size = sizeof(struct perf_callchain_entry) * PERF_NR_CONTEXTS;
for_each_possible_cpu(cpu) {
entries->cpu_entries[cpu] = kmalloc_node(size, GFP_KERNEL,