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authorIngo Molnar <mingo@elte.hu>2005-09-10 00:26:12 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-10 10:06:22 -0700
commitd79fc0fc6645b0cf5cd980da76942ca6d6300fa4 (patch)
treee74aca1df1d37dbd7af66636a4e39a3f7e1af479 /fs/pipe.c
parent95cdf3b799a481969a48d69a1a52916ad5da6694 (diff)
downloadop-kernel-dev-d79fc0fc6645b0cf5cd980da76942ca6d6300fa4.zip
op-kernel-dev-d79fc0fc6645b0cf5cd980da76942ca6d6300fa4.tar.gz
[PATCH] sched: TASK_NONINTERACTIVE
This patch implements a task state bit (TASK_NONINTERACTIVE), which can be used by blocking points to mark the task's wait as "non-interactive". This does not mean the task will be considered a CPU-hog - the wait will simply not have an effect on the waiting task's priority - positive or negative alike. Right now only pipe_wait() will make use of it, because it's a common source of not-so-interactive waits (kernel compilation jobs, etc.). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/pipe.c')
-rw-r--r--fs/pipe.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/pipe.c b/fs/pipe.c
index 2c7a23d..66aa0b9 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -39,7 +39,11 @@ void pipe_wait(struct inode * inode)
{
DEFINE_WAIT(wait);
- prepare_to_wait(PIPE_WAIT(*inode), &wait, TASK_INTERRUPTIBLE);
+ /*
+ * Pipes are system-local resources, so sleeping on them
+ * is considered a noninteractive wait:
+ */
+ prepare_to_wait(PIPE_WAIT(*inode), &wait, TASK_INTERRUPTIBLE|TASK_NONINTERACTIVE);
up(PIPE_SEM(*inode));
schedule();
finish_wait(PIPE_WAIT(*inode), &wait);
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