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This is a squash of 2 older commits on kernel/sched.c commit 099aa69b9cfb6f4c5b56dd1d1d06ce9ef92cf2d5 Author: Steve Muckle <smuckle@codeaurora.org> Date: Tue Feb 28 14:07:39 2012 -0800 kernel: reduce sleep duration in wait_task_inactive Sleeping for an entire tick adds unnecessary latency to hotplugging a cpu (cpu_up). Change-Id: Iab323a79f4048bc9101ecfd368e0f275827ed4ab Signed-off-by: Steve Muckle <smuckle@codeaurora.org> commit 52984e96358c55f89947c6de6e63d70261479f67 Author: Jeff Ohlstein <johlstei@codeaurora.org> Date: Wed Jun 23 12:59:04 2010 -0700 sched: Extend completion api to allow io_wait time tracking Adds a function wait_for_completion_io which behaves like wait_for_completion, except it calls io_schedule instead of schedule. This indicates that the process waiting on the completion is waiting on an io event, and keeps statistics accordingly. Change-Id: I2514d62ff7f26441782a4cbebc4a18c07bb5ad74 Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org> Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
#ifndef __LINUX_COMPLETION_H
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#define __LINUX_COMPLETION_H
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/*
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* (C) Copyright 2001 Linus Torvalds
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*
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* Atomic wait-for-completion handler data structures.
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* See kernel/sched.c for details.
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*/
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#include <linux/wait.h>
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/*
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* struct completion - structure used to maintain state for a "completion"
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*
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* This is the opaque structure used to maintain the state for a "completion".
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* Completions currently use a FIFO to queue threads that have to wait for
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* the "completion" event.
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*
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* See also: complete(), wait_for_completion() (and friends _timeout,
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* _interruptible, _interruptible_timeout, and _killable), init_completion(),
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* and macros DECLARE_COMPLETION(), DECLARE_COMPLETION_ONSTACK(), and
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* INIT_COMPLETION().
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*/
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struct completion {
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unsigned int done;
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wait_queue_head_t wait;
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};
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#define COMPLETION_INITIALIZER(work) \
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{ 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
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#define COMPLETION_INITIALIZER_ONSTACK(work) \
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({ init_completion(&work); work; })
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/**
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* DECLARE_COMPLETION - declare and initialize a completion structure
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* @work: identifier for the completion structure
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*
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* This macro declares and initializes a completion structure. Generally used
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* for static declarations. You should use the _ONSTACK variant for automatic
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* variables.
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*/
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#define DECLARE_COMPLETION(work) \
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struct completion work = COMPLETION_INITIALIZER(work)
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/*
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* Lockdep needs to run a non-constant initializer for on-stack
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* completions - so we use the _ONSTACK() variant for those that
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* are on the kernel stack:
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*/
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/**
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* DECLARE_COMPLETION_ONSTACK - declare and initialize a completion structure
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* @work: identifier for the completion structure
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*
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* This macro declares and initializes a completion structure on the kernel
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* stack.
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*/
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#ifdef CONFIG_LOCKDEP
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# define DECLARE_COMPLETION_ONSTACK(work) \
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struct completion work = COMPLETION_INITIALIZER_ONSTACK(work)
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#else
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# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
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#endif
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/**
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* init_completion - Initialize a dynamically allocated completion
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* @x: completion structure that is to be initialized
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*
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* This inline function will initialize a dynamically created completion
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* structure.
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*/
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static inline void init_completion(struct completion *x)
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{
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x->done = 0;
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init_waitqueue_head(&x->wait);
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}
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extern void wait_for_completion(struct completion *);
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extern void wait_for_completion_io(struct completion *);
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extern int wait_for_completion_interruptible(struct completion *x);
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extern int wait_for_completion_killable(struct completion *x);
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extern unsigned long wait_for_completion_timeout(struct completion *x,
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unsigned long timeout);
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extern long wait_for_completion_interruptible_timeout(
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struct completion *x, unsigned long timeout);
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extern long wait_for_completion_killable_timeout(
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struct completion *x, unsigned long timeout);
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extern bool try_wait_for_completion(struct completion *x);
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extern bool completion_done(struct completion *x);
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extern void complete(struct completion *);
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extern void complete_all(struct completion *);
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/**
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* INIT_COMPLETION - reinitialize a completion structure
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* @x: completion structure to be reinitialized
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*
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* This macro should be used to reinitialize a completion structure so it can
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* be reused. This is especially important after complete_all() is used.
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*/
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#define INIT_COMPLETION(x) ((x).done = 0)
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#endif
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