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/* Framework for putting a jprobe in a tasklet. */
/* Useful for testing probes in interrupt context. */
/* Doesn't do anything useful as is. Put test code in the inst func */
#define HASH_TABLE_BITS 8
#define HASH_TABLE_SIZE (1<<HASH_TABLE_BITS)
#define BUCKETS 16 /* largest histogram width */
#define STP_NETLINK_ONLY
#define STP_NUM_STRINGS 1
#include "runtime.h"
#include "probes.c"
MODULE_DESCRIPTION("test jprobes of tasklets");
MODULE_AUTHOR("Martin Hunt <hunt@redhat.com>");
void inst__rcu_process_callbacks(struct rcu_ctrlblk *rcp,
struct rcu_state *rsp, struct rcu_data *rdp)
{
_stp_log ("interrupt=%d\n", in_interrupt());
jprobe_return();
}
static struct jprobe stp_probes[] = {
{
.kp.addr = (kprobe_opcode_t *)"__rcu_process_callbacks",
.entry = (kprobe_opcode_t *) inst__rcu_process_callbacks
},
};
#define MAX_STP_PROBES (sizeof(stp_probes)/sizeof(struct jprobe))
static unsigned n_subbufs = 4;
module_param(n_subbufs, uint, 0);
MODULE_PARM_DESC(n_subbufs, "number of sub-buffers per per-cpu buffer");
static unsigned subbuf_size = 65536;
module_param(subbuf_size, uint, 0);
MODULE_PARM_DESC(subbuf_size, "size of each per-cpu sub-buffers");
static int pid;
module_param(pid, int, 0);
MODULE_PARM_DESC(pid, "daemon pid");
static int init_stp(void)
{
int ret;
if (!pid) {
printk("init_dtr: Can't start without daemon pid\n");
return -1;
}
if (_stp_transport_open(n_subbufs, subbuf_size, pid) < 0) {
printk("init_dtr: Couldn't open transport\n");
return -1;
}
ret = _stp_register_jprobes (stp_probes, MAX_STP_PROBES);
printk("instrumentation is enabled...\n");
return ret;
}
static int exited; /* FIXME: this is a stopgap - if we don't do this
* and are manually removed, bad things happen */
static void probe_exit (void)
{
exited = 1;
_stp_unregister_jprobes (stp_probes, MAX_STP_PROBES);
_stp_log ("EXIT\n");
}
static void cleanup_stp(void)
{
if (!exited)
probe_exit();
_stp_transport_close();
}
module_init(init_stp);
module_exit(cleanup_stp);
MODULE_LICENSE("GPL");
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