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| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-09-08 08:58:59 -0700 |
|---|---|---|
| committer | Arjan van de Ven <arjan@linux.intel.com> | 2008-09-11 07:16:55 -0700 |
| commit | 3bd012060f962567aadb52b27b2fc8fdc91102c7 (patch) | |
| tree | 304f42afb3131c785b0b5c224e93a1e31a0b00c8 /kernel/hrtimer.c | |
| parent | 96d2ab484e7a9bafdab44b8c7d1ef5944319b18c (diff) | |
| download | lwn-3bd012060f962567aadb52b27b2fc8fdc91102c7.tar.gz lwn-3bd012060f962567aadb52b27b2fc8fdc91102c7.zip | |
hrtimer: make the nanosleep() syscall use the per process slack
This patch makes the nanosleep() system call use the per process
slack value; with this users are able to externally control existing
applications to reduce the wakeup rate.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Diffstat (limited to 'kernel/hrtimer.c')
| -rw-r--r-- | kernel/hrtimer.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index a0222097c57e..9a4c90185566 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -1563,9 +1563,14 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, struct restart_block *restart; struct hrtimer_sleeper t; int ret = 0; + unsigned long slack; + + slack = current->timer_slack_ns; + if (rt_task(current)) + slack = 0; hrtimer_init_on_stack(&t.timer, clockid, mode); - hrtimer_set_expires(&t.timer, timespec_to_ktime(*rqtp)); + hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack); if (do_nanosleep(&t, mode)) goto out; |