Messages in this thread Patch in this message | | | Date | Thu, 12 Mar 2009 10:24:51 GMT | From | Darren Hart <> | Subject | [tip:core/futexes] futex: use current->time_slack_ns for rt tasks too |
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Commit-ID: 16f4993f4e9860715918efd4eeac928f8de1218b Gitweb: http://git.kernel.org/tip/16f4993f4e9860715918efd4eeac928f8de1218b Author: "Darren Hart" <dvhltc@us.ibm.com> AuthorDate: Thu, 12 Mar 2009 00:55:59 -0700 Commit: Ingo Molnar <mingo@elte.hu> CommitDate: Thu, 12 Mar 2009 11:20:57 +0100
futex: use current->time_slack_ns for rt tasks too
RT tasks should set their timer slack to 0 on their own. This patch removes the 'if (rt_task()) slack = 0;' block in futex_wait.
Build and boot tested on a 4 way Intel x86_64 workstation. Passes basic pthread_mutex and PI tests out of ltp/testcases/realtime.
Signed-off-by: Darren Hart <dvhltc@us.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Arjan van de Ven <arjan@linux.intel.com> LKML-Reference: <20090312075559.9856.28822.stgit@Aeon> Signed-off-by: Ingo Molnar <mingo@elte.hu>
--- kernel/futex.c | 7 ++----- 1 files changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c index e149545..6579912 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -1253,16 +1253,13 @@ retry: if (!abs_time) schedule(); else { - unsigned long slack; - slack = current->timer_slack_ns; - if (rt_task(current)) - slack = 0; hrtimer_init_on_stack(&t.timer, clockrt ? CLOCK_REALTIME : CLOCK_MONOTONIC, HRTIMER_MODE_ABS); hrtimer_init_sleeper(&t, current); - hrtimer_set_expires_range_ns(&t.timer, *abs_time, slack); + hrtimer_set_expires_range_ns(&t.timer, *abs_time, + current->timer_slack_ns); hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS); if (!hrtimer_active(&t.timer))
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