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author | Thomas Gleixner <tglx@linutronix.de> | 2019-08-21 21:09:23 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2019-08-28 11:50:42 +0200 |
commit | 8991afe2640d05a805eba01277856e8549cdc838 (patch) | |
tree | 22eb3c595da6c5aebc8beab65def6873233b5359 /kernel | |
parent | dd6702241337bcd0bae01d2644b7bae1a496d937 (diff) | |
download | linux-stable-8991afe2640d05a805eba01277856e8549cdc838.tar.gz linux-stable-8991afe2640d05a805eba01277856e8549cdc838.tar.bz2 linux-stable-8991afe2640d05a805eba01277856e8549cdc838.zip |
posix-cpu-timers: Deduplicate rlimit handling
Both thread and process expiry functions have the same functionality for
sending signals for soft and hard RLIMITs duplicated in 4 different
ways.
Split it out into a common function and cleanup the callsites.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lkml.kernel.org/r/20190821192922.653276779@linutronix.de
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/time/posix-cpu-timers.c | 67 |
1 files changed, 25 insertions, 42 deletions
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index 115c8dfa4d46..ef39a7a4a95c 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -772,6 +772,20 @@ static inline void check_dl_overrun(struct task_struct *tsk) } } +static bool check_rlimit(u64 time, u64 limit, int signo, bool rt, bool hard) +{ + if (time < limit) + return false; + + if (print_fatal_signals) { + pr_info("%s Watchdog Timeout (%s): %s[%d]\n", + rt ? "RT" : "CPU", hard ? "hard" : "soft", + current->comm, task_pid_nr(current)); + } + __group_send_sig_info(signo, SEND_SIG_PRIV, current); + return true; +} + /* * Check for any per-thread CPU timers that have fired and move them off * the tsk->cpu_timers[N] list onto the firing list. Here we update the @@ -799,34 +813,18 @@ static void check_thread_timers(struct task_struct *tsk, soft = task_rlimit(tsk, RLIMIT_RTTIME); if (soft != RLIM_INFINITY) { /* Task RT timeout is accounted in jiffies. RTTIME is usec */ - unsigned long rtim = tsk->rt.timeout * (USEC_PER_SEC / HZ); + unsigned long rttime = tsk->rt.timeout * (USEC_PER_SEC / HZ); unsigned long hard = task_rlimit_max(tsk, RLIMIT_RTTIME); - if (hard != RLIM_INFINITY && rtim >= hard) { - /* - * At the hard limit, we just die. - * No need to calculate anything else now. - */ - if (print_fatal_signals) { - pr_info("CPU Watchdog Timeout (hard): %s[%d]\n", - tsk->comm, task_pid_nr(tsk)); - } - __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); + /* At the hard limit, send SIGKILL. No further action. */ + if (hard != RLIM_INFINITY && + check_rlimit(rttime, hard, SIGKILL, true, true)) return; - } - if (rtim >= soft) { - /* - * At the soft limit, send a SIGXCPU every second. - */ + /* At the soft limit, send a SIGXCPU every second */ + if (check_rlimit(rttime, soft, SIGXCPU, true, false)) { soft += USEC_PER_SEC; tsk->signal->rlim[RLIMIT_RTTIME].rlim_cur = soft; - - if (print_fatal_signals) { - pr_info("RT Watchdog Timeout (soft): %s[%d]\n", - tsk->comm, task_pid_nr(tsk)); - } - __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); } } @@ -916,28 +914,13 @@ static void check_process_timers(struct task_struct *tsk, u64 softns = (u64)soft * NSEC_PER_SEC; u64 hardns = (u64)hard * NSEC_PER_SEC; - if (hard != RLIM_INFINITY && ptime >= hardns) { - /* - * At the hard limit, we just die. - * No need to calculate anything else now. - */ - if (print_fatal_signals) { - pr_info("RT Watchdog Timeout (hard): %s[%d]\n", - tsk->comm, task_pid_nr(tsk)); - } - __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); + /* At the hard limit, send SIGKILL. No further action. */ + if (hard != RLIM_INFINITY && + check_rlimit(ptime, hardns, SIGKILL, false, true)) return; - } - if (ptime >= softns) { - /* - * At the soft limit, send a SIGXCPU every second. - */ - if (print_fatal_signals) { - pr_info("CPU Watchdog Timeout (soft): %s[%d]\n", - tsk->comm, task_pid_nr(tsk)); - } - __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); + /* At the soft limit, send a SIGXCPU every second */ + if (check_rlimit(ptime, softns, SIGXCPU, false, false)) { sig->rlim[RLIMIT_CPU].rlim_cur = soft + 1; softns += NSEC_PER_SEC; } |