sched: affine sync wakeups

make sync wakeups affine for cache-cold tasks: if a cache-cold task
is woken up by a sync wakeup then use the opportunity to migrate it
straight away. (the two tasks are 'related' because they communicate)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/pipe.c b/fs/pipe.c
index f1fa2b412f0e..e66ec48e95d8 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -382,7 +382,7 @@ redo:
 
         /* Signal writers asynchronously that there is more room. */
         if (do_wakeup) {
-                wake_up_interruptible(&pipe->wait);
+                wake_up_interruptible_sync(&pipe->wait);
                 kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
         }
         if (ret > 0)
@@ -555,7 +555,7 @@ redo2:
 out:
         mutex_unlock(&inode->i_mutex);
         if (do_wakeup) {
-                wake_up_interruptible(&pipe->wait);
+                wake_up_interruptible_sync(&pipe->wait);
                 kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
         }
         if (ret > 0)
@@ -649,7 +649,7 @@ pipe_release(struct inode *inode, int decr, int decw)
         if (!pipe->readers && !pipe->writers) {
                 free_pipe_info(inode);
         } else {
-                wake_up_interruptible(&pipe->wait);
+                wake_up_interruptible_sync(&pipe->wait);
                 kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
                 kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
         }