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Exclude untied tasks from task stealing constraint

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If either current_task or new_task is untied then skip task scheduling
constraint checks, because untied tasks are not affected by the task
scheduling constraints.

Differential Revision: http://reviews.llvm.org/D21196

llvm-svn: 272570
This commit is contained in:
Jonathan Peyton
2016-06-13 17:51:59 +00:00
parent fb2342d274
commit 8cb45c838f
1 changed files with 2 additions and 2 deletions
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4
openmp/runtime/src/kmp_tasking.c
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@@ -1644,7 +1644,7 @@ __kmp_remove_my_task( kmp_info_t * thread, kmp_int32 gtid, kmp_task_team_t *task
tail = ( thread_data -> td.td_deque_tail - 1 ) & TASK_DEQUE_MASK(thread_data->td); // Wrap index.
taskdata = thread_data -> td.td_deque[ tail ];
if (is_constrained) {
if (is_constrained && (taskdata->td_flags.tiedness == TASK_TIED)) {
// we need to check if the candidate obeys task scheduling constraint:
// only child of current task can be scheduled
kmp_taskdata_t * current = thread->th.th_current_task;
@@ -1751,7 +1751,7 @@ __kmp_steal_task( kmp_info_t *victim, kmp_int32 gtid, kmp_task_team_t *task_team
parent = parent->td_parent; // check generation up to the level of the current task
KMP_DEBUG_ASSERT(parent != NULL);
}
if ( parent != current ) {
if ( parent != current && (taskdata->td_flags.tiedness == TASK_TIED) ) { // untied is always allowed to be stolen
// If the tail task is not a child, then no other childs can appear in the deque (?).
__kmp_release_bootstrap_lock( & victim_td -> td.td_deque_lock );
KA_TRACE(10, ("__kmp_steal_task(exit #2): T#%d could not steal from T#%d: task_team=%p "