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File: [cvs.NetBSD.org] / src / sys / kern / kern_idle.c (download)

Revision 1.25, Sun Jan 29 22:55:40 2012 UTC (12 years, 2 months ago) by rmind
Branch: MAIN
CVS Tags: yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, tls-maxphys-base-20171202, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, rmind-smpnet-nbase, rmind-smpnet-base, rmind-smpnet, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20191119, phil-wifi-20190609, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, nick-nhusb-base-20170825, nick-nhusb-base-20170204, nick-nhusb-base-20161204, nick-nhusb-base-20161004, nick-nhusb-base-20160907, nick-nhusb-base-20160529, nick-nhusb-base-20160422, nick-nhusb-base-20160319, nick-nhusb-base-20151226, nick-nhusb-base-20150921, nick-nhusb-base-20150606, nick-nhusb-base-20150406, nick-nhusb-base, nick-nhusb, netbsd-9-base, netbsd-9-3-RELEASE, netbsd-9-2-RELEASE, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, localcount-20160914, khorben-n900, jmcneill-usbmp-base9, jmcneill-usbmp-base8, jmcneill-usbmp-base7, jmcneill-usbmp-base6, jmcneill-usbmp-base5, jmcneill-usbmp-base4, jmcneill-usbmp-base3, jmcneill-usbmp-base2, jmcneill-usbmp-base10, jdolecek-ncq-base, jdolecek-ncq, isaki-audio2-base, isaki-audio2, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, agc-symver-base, agc-symver
Branch point for: phil-wifi
Changes since 1.24: +3 -2 lines 

- Add mi_cpu_init() and initialise cpu_lock and kcpuset_attached/running there.
- Add kcpuset_running which gets set in idle_loop().
- Use kcpuset_running in pserialize_perform().

/*	$NetBSD: kern_idle.c,v 1.25 2012/01/29 22:55:40 rmind Exp $	*/

/*-
 * Copyright (c)2002, 2006, 2007 YAMAMOTO Takashi,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>

__KERNEL_RCSID(0, "$NetBSD: kern_idle.c,v 1.25 2012/01/29 22:55:40 rmind Exp $");

#include <sys/param.h>
#include <sys/cpu.h>
#include <sys/idle.h>
#include <sys/kthread.h>
#include <sys/lockdebug.h>
#include <sys/kmem.h>
#include <sys/proc.h>
#include <sys/atomic.h>

#include <uvm/uvm.h>	/* uvm_pageidlezero */
#include <uvm/uvm_extern.h>

void
idle_loop(void *dummy)
{
	struct cpu_info *ci = curcpu();
	struct schedstate_percpu *spc;
	struct lwp *l = curlwp;

	kcpuset_atomic_set(kcpuset_running, cpu_index(ci));
	ci->ci_data.cpu_onproc = l;

	/* Update start time for this thread. */
	lwp_lock(l);
	binuptime(&l->l_stime);
	lwp_unlock(l);

	/*
	 * Use spl0() here to ensure that we have the correct interrupt
	 * priority.  This may be the first thread running on the CPU,
	 * in which case we took a dirtbag route to get here.
	 */
	spc = &ci->ci_schedstate;
	(void)splsched();
	spc->spc_flags |= SPCF_RUNNING;
	spl0();

	KERNEL_UNLOCK_ALL(l, NULL);
	l->l_stat = LSONPROC;
	l->l_pflag |= LP_RUNNING;
	for (;;) {
		LOCKDEBUG_BARRIER(NULL, 0);
		KASSERT((l->l_flag & LW_IDLE) != 0);
		KASSERT(ci == curcpu());
		KASSERT(l == curlwp);
		KASSERT(CURCPU_IDLE_P());
		KASSERT(l->l_priority == PRI_IDLE);

		sched_idle();
		if (!sched_curcpu_runnable_p()) {
			if ((spc->spc_flags & SPCF_OFFLINE) == 0) {
				uvm_pageidlezero();
			}
			if (!sched_curcpu_runnable_p()) {
				cpu_idle();
				if (!sched_curcpu_runnable_p() &&
				    !ci->ci_want_resched) {
					continue;
				}
			}
		}
		KASSERT(l->l_mutex == l->l_cpu->ci_schedstate.spc_lwplock);
		lwp_lock(l);
		mi_switch(l);
		KASSERT(curlwp == l);
		KASSERT(l->l_stat == LSONPROC);
	}
}

int
create_idle_lwp(struct cpu_info *ci)
{
	lwp_t *l;
	int error;

	KASSERT(ci->ci_data.cpu_idlelwp == NULL);
	error = kthread_create(PRI_IDLE, KTHREAD_MPSAFE | KTHREAD_IDLE,
	    ci, idle_loop, NULL, &l, "idle/%u", ci->ci_index);
	if (error != 0)
		panic("create_idle_lwp: error %d", error);
	lwp_lock(l);
	l->l_flag |= LW_IDLE;
	lwp_unlock(l);
	l->l_cpu = ci;
	ci->ci_data.cpu_idlelwp = l;

	return error;
}