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/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include <stdbool.h>
#include "lib/defines.h"
#include "lib/utils.h"
#include "lib/kru.h"
/// Initialize defer, incl. shared memory with KRU, excl. idle.
KR_EXPORT
int defer_init(const char *mmap_file, uint32_t log_period, int cpus);
/// Initialize idle.
int defer_init_idle(uv_loop_t *loop);
/// Deinitialize shared memory.
void defer_deinit(void);
/// Increment KRU counters by the given time.
void defer_charge(uint64_t nsec, union kr_sockaddr *addr, bool stream);
typedef struct {
bool is_accounting; /// whether currently accounting the time to someone
union kr_sockaddr addr; /// request source (to which we account) or AF_UNSPEC if unknown yet
bool stream;
uint64_t stamp; /// monotonic nanoseconds, probably won't wrap
} defer_sample_state_t;
extern defer_sample_state_t defer_sample_state;
extern struct defer *defer; /// skip sampling/deferring if NULL
extern bool defer_initialized; /// defer_init was called, possibly keeping defer disabled
extern uint64_t defer_uvtime_stamp; /// stamp of the last uv time update
// TODO: reconsider `static inline` cases below
#include <time.h>
static inline uint64_t defer_get_stamp(void)
{
struct timespec now_ts = {0};
clock_gettime(CLOCK_THREAD_CPUTIME_ID, &now_ts);
uint64_t stamp = now_ts.tv_nsec + 1000*1000*1000 * (uint64_t)now_ts.tv_sec;
if (defer_uvtime_stamp + 1000*1000 < stamp) {
defer_uvtime_stamp = stamp;
uv_update_time(uv_default_loop());
}
return stamp;
}
/// Annotate the work currently being accounted by an IP address.
static inline void defer_sample_addr(const union kr_sockaddr *addr, bool stream)
{
if (!defer || kr_fails_assert(addr)) return;
if (!defer_sample_state.is_accounting) return;
if (defer_sample_state.addr.ip.sa_family != AF_UNSPEC) {
// TODO: this costs performance, so only in some debug mode?
if (kr_sockaddr_cmp(&addr->ip, &defer_sample_state.addr.ip) != kr_ok()) {
char defer_addr[KR_STRADDR_MAXLEN + 1] = { 0 };
strncpy(defer_addr, kr_straddr(&defer_sample_state.addr.ip), sizeof(defer_addr) - 1);
kr_log_warning(DEFER, "Sampling address mismatch: %s != %s\n",
kr_straddr(&addr->ip),
defer_addr);
return;
}
}
switch (addr->ip.sa_family) {
case AF_INET:
defer_sample_state.addr.ip4 = addr->ip4;
break;
case AF_INET6:
defer_sample_state.addr.ip6 = addr->ip6;
break;
default:
defer_sample_state.addr.ip.sa_family = AF_UNSPEC;
break;
}
defer_sample_state.stream = stream;
}
/// Internal; start accounting work at specified timestamp.
static inline void defer_sample_start_stamp(uint64_t stamp)
{
if (!defer) return;
kr_assert(!defer_sample_state.is_accounting);
defer_sample_state.is_accounting = true;
defer_sample_state.stamp = stamp;
defer_sample_state.addr.ip.sa_family = AF_UNSPEC;
}
/// Internal; stop accounting work at specified timestamp and charge the source if applicable.
static inline void defer_sample_stop_stamp(uint64_t stamp)
{
if (!defer) return;
kr_assert(defer_sample_state.is_accounting);
defer_sample_state.is_accounting = false;
if (defer_sample_state.addr.ip.sa_family == AF_UNSPEC) return;
const uint64_t elapsed = stamp - defer_sample_state.stamp;
if (elapsed == 0) return;
// TODO: some queries of internal origin have suspicioiusly high numbers.
// We won't be really accounting those, but it might suggest some other issue.
defer_charge(elapsed, &defer_sample_state.addr, defer_sample_state.stream);
}
static inline bool defer_sample_is_accounting(void)
{
return defer_sample_state.is_accounting;
}
/// Start accounting work; optionally save state of current accounting.
/// Current state can be saved only after having an address assigned.
static inline void defer_sample_start(defer_sample_state_t *prev_state_out) {
if (!defer) return;
uint64_t stamp = defer_get_stamp();
// suspend
if (prev_state_out) {
*prev_state_out = defer_sample_state; // TODO stamp is not needed
if (defer_sample_state.is_accounting)
defer_sample_stop_stamp(stamp);
}
// start
defer_sample_start_stamp(stamp);
}
/// Stop accounting and start it again.
static inline void defer_sample_restart(void) {
if (!defer) return;
uint64_t stamp = defer_get_stamp();
// stop
defer_sample_stop_stamp(stamp);
// start
defer_sample_start_stamp(stamp);
}
/// Stop accounting and charge the source if applicable; optionally resume previous accounting.
static inline void defer_sample_stop(defer_sample_state_t *prev_state, bool reuse_last_stamp) {
if (!defer) return;
uint64_t stamp = reuse_last_stamp ? defer_sample_state.stamp : defer_get_stamp();
// stop
defer_sample_stop_stamp(stamp);
// resume
if (prev_state) {
defer_sample_state = *prev_state;
defer_sample_state.stamp = stamp;
}
}
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