mirror of
https://github.com/systemd/systemd
synced 2024-09-06 16:56:43 +00:00
basic/log: put a ratelimit on our logging to /dev/kmsg
See the inline comment for details.
This commit is contained in:
parent
6123dfaa72
commit
78158d134b
|
@ -29,6 +29,7 @@
|
|||
#include "parse-util.h"
|
||||
#include "proc-cmdline.h"
|
||||
#include "process-util.h"
|
||||
#include "ratelimit.h"
|
||||
#include "signal-util.h"
|
||||
#include "socket-util.h"
|
||||
#include "stdio-util.h"
|
||||
|
@ -459,6 +460,15 @@ static int write_to_kmsg(
|
|||
const char *func,
|
||||
const char *buffer) {
|
||||
|
||||
/* Set a ratelimit on the amount of messages logged to /dev/kmsg. This is mostly supposed to be a
|
||||
* safety catch for the case where start indiscriminately logging in a loop. It will not catch cases
|
||||
* where we log excessively, but not in a tight loop.
|
||||
*
|
||||
* Note that this ratelimit is per-emitter, so we might still overwhelm /dev/kmsg with multiple
|
||||
* loggers.
|
||||
*/
|
||||
static thread_local RateLimit ratelimit = { 5 * USEC_PER_SEC, 200 };
|
||||
|
||||
char header_priority[2 + DECIMAL_STR_MAX(int) + 1],
|
||||
header_pid[4 + DECIMAL_STR_MAX(pid_t) + 1];
|
||||
struct iovec iovec[5] = {};
|
||||
|
@ -466,6 +476,9 @@ static int write_to_kmsg(
|
|||
if (kmsg_fd < 0)
|
||||
return 0;
|
||||
|
||||
if (!ratelimit_below(&ratelimit))
|
||||
return 0;
|
||||
|
||||
xsprintf(header_priority, "<%i>", level);
|
||||
xsprintf(header_pid, "["PID_FMT"]: ", getpid_cached());
|
||||
|
||||
|
|
Loading…
Reference in a new issue