/* -*- linux-c -*-
* Stat Runtime Functions
* Copyright (C) 2012 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _LINUX_STAT_RUNTIME_H_
#define _LINUX_STAT_RUNTIME_H_
/* for the paranoid. */
#ifdef NEED_STAT_LOCKS
#define STAT_LOCK(sd) spin_lock(&sd->lock)
#define STAT_UNLOCK(sd) spin_unlock(&sd->lock)
#define STAT_GET_CPU() get_cpu()
#define STAT_PUT_CPU() put_cpu()
#else
#define STAT_LOCK(sd) do {} while (0)
#define STAT_UNLOCK(sd) do {} while (0)
/* get/put_cpu wrappers. Unnecessary if caller is already atomic. */
#ifdef CONFIG_PREEMPT_RT_FULL
#define STAT_GET_CPU() raw_smp_processor_id()
#else
#define STAT_GET_CPU() smp_processor_id()
#endif
#define STAT_PUT_CPU() do {} while (0)
#endif
/** Stat struct. Maps do not need this */
typedef struct _Stat {
struct _Hist hist;
/* aggregated data */
stat_data *agg;
/* The stat data is per-cpu data. */
stat_data *sd;
} *Stat;
static Stat _stp_stat_alloc(size_t stat_data_size)
{
Stat st;
if (stat_data_size < sizeof(stat_data))
return NULL;
/* Called from module_init, so user context, may sleep alloc. */
st = _stp_kmalloc_gfp (sizeof(struct _Stat), STP_ALLOC_SLEEP_FLAGS);
if (st == NULL)
return NULL;
st->agg = _stp_kzalloc_gfp (stat_data_size, STP_ALLOC_SLEEP_FLAGS);
if (st->agg == NULL) {
_stp_kfree (st);
return NULL;
}
st->sd = _stp_alloc_percpu (stat_data_size);
if (st->sd == NULL) {
_stp_kfree (st->agg);
_stp_kfree (st);
return NULL;
}
return st;
}
static void _stp_stat_free(Stat st)
{
if (st) {
_stp_free_percpu (st->sd);
_stp_kfree (st->agg);
_stp_kfree (st);
}
}
#define _stp_stat_get_agg(stat) ((stat)->agg)
#define _stp_stat_per_cpu_ptr(stat, cpu) per_cpu_ptr((stat)->sd, (cpu))
static int _stp_stat_initialize_locks(Stat st)
{
#ifdef NEED_STAT_LOCKS
int i;
for_each_possible_cpu(i) {
stat_data *sdp = _stp_stat_per_cpu_ptr(st, i);
spin_lock_init(&sdp->lock);
}
spin_lock_init(&st->agg->lock);
#endif
return 0;
}
#define _stp_stat_destroy_locks(st) do {} while (0)
#endif /* _LINUX_STAT_RUNTIME_H_ */
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