The patch titled
pipe: use event aware wakeups
has been added to the -mm tree. Its filename is
pipe-use-event-aware-wakeups.patch
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------------------------------------------------------
Subject: pipe: use event aware wakeups
From: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
Send the events the wakeup refers to, so that epoll, and even the new poll
code in fs/select.c can avoid wakeups if the events do not match the
requested set.
Signed-off-by: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
Acked-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/pipe.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff -puN fs/pipe.c~pipe-use-event-aware-wakeups fs/pipe.c
--- a/fs/pipe.c~pipe-use-event-aware-wakeups
+++ a/fs/pipe.c
@@ -441,7 +441,7 @@ redo:
break;
}
if (do_wakeup) {
- wake_up_interruptible_sync(&pipe->wait);
+ wake_up_interruptible_sync_poll(&pipe->wait, POLLOUT);
kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
pipe_wait(pipe);
@@ -450,7 +450,7 @@ redo:
/* Signal writers asynchronously that there is more room. */
if (do_wakeup) {
- wake_up_interruptible_sync(&pipe->wait);
+ wake_up_interruptible_sync_poll(&pipe->wait, POLLOUT);
kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
if (ret > 0)
@@ -612,7 +612,7 @@ redo2:
break;
}
if (do_wakeup) {
- wake_up_interruptible_sync(&pipe->wait);
+ wake_up_interruptible_sync_poll(&pipe->wait, POLLIN);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
do_wakeup = 0;
}
@@ -623,7 +623,7 @@ redo2:
out:
mutex_unlock(&inode->i_mutex);
if (do_wakeup) {
- wake_up_interruptible_sync(&pipe->wait);
+ wake_up_interruptible_sync_poll(&pipe->wait, POLLIN);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
}
if (ret > 0)
@@ -715,7 +715,7 @@ pipe_release(struct inode *inode, int de
if (!pipe->readers && !pipe->writers) {
free_pipe_info(inode);
} else {
- wake_up_interruptible_sync(&pipe->wait);
+ wake_up_interruptible_sync_poll(&pipe->wait, POLLIN | POLLOUT);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
kill_fasync(&pipe->fasync_writers, SIGIO, POLL_OUT);
}
_
Patches currently in -mm which might be from davidel@xxxxxxxxxxxxxxx are
linux-next.patch
epoll-convert-max_user_watches-to-long.patch
pipe-use-event-aware-wakeups.patch
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