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Date: Sat, 23 Feb 2002 16:03:06 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <200202240003.g1O036164477@apollo.backplane.com>
To: Bruce Evans <bde@zeta.org.au>
Cc: Terry Lambert <tlambert2@mindspring.com>,
	Alfred Perlstein <alfred@FreeBSD.ORG>,
	Bosko Milekic <bmilekic@unixdaemons.com>,
	Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp>,
	<current@FreeBSD.ORG>, John Baldwin <jhb@FreeBSD.ORG>
Subject: Re: malloc_bucket() idea (was Re: How to fix malloc.)
References:  <20020224105118.L30818-100000@gamplex.bde.org>
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:My version of it does less than this.  I only use it to help implement
:spinlocks.

    You put together infrastructure to deal with pending pci interrupts?
    If so, then why not commit it (or at least commit a version #ifdef'd
    for the i386 architecture).

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>
    

:Index: kern_switch.c
:===================================================================
:RCS file: /home/ncvs/src/sys/kern/kern_switch.c,v
:retrieving revision 1.20
:diff -u -2 -r1.20 kern_switch.c
:--- kern_switch.c	11 Feb 2002 20:37:51 -0000	1.20
:+++ kern_switch.c	13 Feb 2002 05:34:20 -0000
:@@ -70,14 +70,21 @@
: }
:
:-/* Critical sections that prevent preemption. */
:+/*-
:+ * Critical section handling.
:+ * XXX doesn't belong here.
:+ *
:+ * Entering a critical section only blocks non-fast interrupts.
:+ * critical_enter() is similar to splhigh() in a 2-level spl setup under
:+ * old versions of FreeBSD.
:+ *
:+ * Exiting from all critical sections unblocks non-fast interrupts and runs
:+ * the handlers of any that were blocked.  critical_exit() is similar to
:+ * spl(old_level) in a 2-level spl setup under old versions of FreeBSD.
:+ */
: void
: critical_enter(void)
: {
:-	struct thread *td;
:
:-	td = curthread;
:-	if (td->td_critnest == 0)
:-		td->td_savecrit = cpu_critical_enter();
:-	td->td_critnest++;
:+	curthread->td_critnest++;
: }
:
:@@ -85,12 +92,7 @@
: critical_exit(void)
: {
:-	struct thread *td;
:
:-	td = curthread;
:-	if (td->td_critnest == 1) {
:-		td->td_critnest = 0;
:-		cpu_critical_exit(td->td_savecrit);
:-	} else
:-		td->td_critnest--;
:+	if (--curthread->td_critnest == 0 && (ipending | spending) != 0)
:+		unpend();
: }
:
:Bruce

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