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Pekka J Enberg a écrit :
> Hi Christoph,
>
> On Mon, 4 Feb 2008, Christoph Lameter wrote:
>> The statistics provided here allow the monitoring of allocator behavior
>> at the cost of some (minimal) loss of performance. Counters are placed in
>> SLUB's per cpu data structure that is already written to by other code.
>
> Looks good but I am wondering if we want to make the statistics per-CPU so
> that we can see the kmalloc/kfree ping-pong of, for example, hackbench
> better?
AFAIK Christoph patch already have percpu statistics :)
+#define STAT_ATTR(si, text) \
+static ssize_t text##_show(struct kmem_cache *s, char *buf) \
+{ \
+ unsigned long sum = 0; \
+ int cpu; \
+ \
+ for_each_online_cpu(cpu) \
+ sum += get_cpu_slab(s, cpu)->stat[si]; \
+ return sprintf(buf, "%lu\n", sum); \
+} \
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