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| author | Ingo Molnar <mingo@elte.hu> | 2005-09-10 00:26:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-10 10:06:22 -0700 |
| commit | d79fc0fc6645b0cf5cd980da76942ca6d6300fa4 (patch) | |
| tree | e74aca1df1d37dbd7af66636a4e39a3f7e1af479 /fs/pipe.c | |
| parent | 95cdf3b799a481969a48d69a1a52916ad5da6694 (diff) | |
| download | lwn-d79fc0fc6645b0cf5cd980da76942ca6d6300fa4.tar.gz lwn-d79fc0fc6645b0cf5cd980da76942ca6d6300fa4.zip | |
[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.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/pipe.c b/fs/pipe.c index 2c7a23dde2d8..66aa0b938d6a 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); |