diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2009-04-09 18:20:08 +0000 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2009-04-27 10:36:59 -0700 |
| commit | 55e3b46ded854d9fc2408d0d15a6a5aea4986333 (patch) | |
| tree | 0f4c076bffe04deaf6b9d8cc67fdc7b6e3b74755 /kernel | |
| parent | 3fe90c4dc50b1c4030d73d196a5d812ea906a4c9 (diff) | |
posix-timers: fix RLIMIT_CPU && setitimer(CPUCLOCK_PROF)
upstream commit: 8f2e586567b1bad72dac7c3810fe9a2ef7117506
update_rlimit_cpu() tries to optimize out set_process_cpu_timer() in case
when we already have CPUCLOCK_PROF timer which should expire first. But it
uses cputime_lt() instead of cputime_gt().
Test case:
int main(void)
{
struct itimerval it = {
.it_value = { .tv_sec = 1000 },
};
assert(!setitimer(ITIMER_PROF, &it, NULL));
struct rlimit rl = {
.rlim_cur = 1,
.rlim_max = 1,
};
assert(!setrlimit(RLIMIT_CPU, &rl));
for (;;)
;
return 0;
}
Without this patch, the task is not killed as RLIMIT_CPU demands.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Peter Lojkin <ia6432@inbox.ru>
Cc: Roland McGrath <roland@redhat.com>
Cc: stable@kernel.org
LKML-Reference: <20090327000610.GA10108@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/posix-cpu-timers.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index 476607f5da9c..68647c189f2e 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -18,7 +18,7 @@ void update_rlimit_cpu(unsigned long rlim_new) cputime = secs_to_cputime(rlim_new); if (cputime_eq(current->signal->it_prof_expires, cputime_zero) || - cputime_lt(current->signal->it_prof_expires, cputime)) { + cputime_gt(current->signal->it_prof_expires, cputime)) { spin_lock_irq(¤t->sighand->siglock); set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL); spin_unlock_irq(¤t->sighand->siglock); |